Telescope review: all 23 active iTelescope systems
Adds TELESCOPES.md, a per-observatory review of every telescope on the iTelescope.net network with a spec block and an assessment for each, a 'choosing a telescope' use-case table, and general observations (CCD to CMOS migration, Bin2 software limits, elevation limits, network-side calibration). Data sourcing: - data/itelescope-telescopes.csv is a verbatim CSV export of iTelescope's maintained specs Google Sheet (24 rows: 23 active scopes + T74 placeholder). - The support article (Freshdesk 247371) supplied observatory groupings and minimum elevation limits; it still lists T9/T19/T31/T69 which the sheet has dropped - the review follows the sheet and records the discrepancy. - go.itelescope.net is an authenticated app shell; nothing was scraped from it. Also fills in the remaining state/ files: TODO (pending: T74 specs, retired scope reconciliation, periodic sheet refresh), DECISIONS (source-of-truth choice, single-document structure, no launchpad scraping), NOTES (refresh command, CSV quirks), ARCHITECTURE (repo layout), and README.
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# itelescope
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Reference and review of the [iTelescope.net](https://www.itelescope.net/) remote
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telescope network: every telescope, its specs, what it is good at, and which one to
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book for a given target.
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- **[TELESCOPES.md](TELESCOPES.md)**: the full review, grouped by observatory, with a
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"choosing a telescope" guide at the end.
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- **[data/itelescope-telescopes.csv](data/itelescope-telescopes.csv)**: snapshot of
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the network's maintained specs sheet (source of truth for the numbers).
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- **state/**: project state under the Default Workflow.
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Sources: the iTelescope support article
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([telescope summary](https://support.itelescope.net/support/solutions/articles/247371))
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and the network's maintained Google Sheet. The launchpad at
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[go.itelescope.net](https://go.itelescope.net/) is login-only.
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# iTelescope.net telescope review
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A review of every telescope on the iTelescope.net network, grouped by observatory.
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Compiled 2026-07-17 from the network's own sources:
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- Support article (observatory summaries, minimum elevations):
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https://support.itelescope.net/support/solutions/articles/247371
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- Maintained specs Google Sheet (snapshotted in [data/itelescope-telescopes.csv](data/itelescope-telescopes.csv)):
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https://docs.google.com/spreadsheets/d/1jZWkkjewOuyNC9YzQ8y2d0pO1e4T7EBeysmQMPBVSOk/
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- The launchpad (https://go.itelescope.net/) is login-only and holds no public specs.
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Note on coverage: the Google Sheet is the maintained source and is what this review
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follows. The older support article additionally lists T9, T19, T31 and T69, which no
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longer appear in the sheet (retired or rebuilt); T74 appears in the sheet with no
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specs, presumably in commissioning.
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## The network at a glance
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| Observatory | MPC code | Hemisphere | Telescopes |
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|---|---|---|---|
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| Utah Desert Remote Observatory, USA | U94 | North | T2, T5, T11, T14, T20, T21, T25, T26, T68 |
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| Sierra Remote Observatory, California, USA | U69 | North | T24 |
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| Siding Spring Observatory, Australia | Q62 | South | T8, T17, T30, T32, T33, T59 |
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| Deep Sky Chile | X07 | South | T70, T71, T72, T73, T74, T75 |
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| AstroCamp Observatory, Spain | I89 | North | T18 |
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| Entre Encinas y Estrellas (e-EyE), Spain | (none listed) | North | T80 |
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Two systems are free to use (30 minutes per day): **T68** (Utah, fast colour
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widefield) and **T33** (Siding Spring, narrow deep field).
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---
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## Utah Desert Remote Observatory (MPC U94)
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Dark Great Basin desert site; the largest cluster on the network and the main
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northern-hemisphere hub.
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### T2: Takahashi TOA-150 + QHY268C (one-shot colour)
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- 150 mm f/7.3 apochromatic refractor, 1105 mm focal length
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- QHY268C colour CMOS (Sony IMX571, APS-C), 0.69"/px, 72.6 x 48.6 arcmin
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- Paramount GTS, off-axis guided, no filters; minimum elevation 25 degrees
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**Review:** the premium one-shot-colour option. Superb refractor optics and a modern
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back-illuminated sensor at a well-sampled 0.69"/px make it the easiest route to a
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finished colour image of medium-sized targets (galaxy groups, planetary nebulae,
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globulars) with no filter runs to plan. No narrowband, so emission nebulae under
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moonlight are off the menu. Files are large (26 MP 16-bit FITS).
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### T5: Takahashi Epsilon 250 + SBIG ST-10XME
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- 250 mm f/3.4 hyperbolic flat-field astrograph, 850 mm focal length
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- ST-10XME CCD (NABG), 1.66"/px, 60.6 x 40.8 arcmin
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- Paramount PME, external guiding; RGB, Ha/SII/OIII, and Johnson-Cousins B, V, I
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**Review:** a fast classic. The f/3.4 Epsilon gathers light quickly for its class and
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the photometric filter set makes it one of the few scopes that does both pretty
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pictures and science. The small, old NABG CCD is the weak point: only 3.2 MP, and
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bright stars bloom on long exposures, so keep subs short around bright fields.
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### T11: Planewave CDK20 + FLI ProLine PL11002M
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- 510 mm (20") f/4.5 corrected Dall-Kirkham with 0.66x reducer, 2280 mm
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- PL11002M CCD (full frame), 0.81"/px, 54.3 x 36.2 arcmin
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- Ascension 200HR; LRGB, 3 nm narrowband, and U, B, V, R, I; minimum elevation 20 degrees
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**Review:** big aperture at a fast reduced focal ratio with a generous field: a strong
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general-purpose deep-space scope for nebulae and larger galaxies, plus full UBVRI for
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photometry. The sensor's 51% peak QE is dated, so it needs more integration time than
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the CMOS scopes for the same depth, and it is noted as sensitive to stray-light
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gradients near full moon.
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### T14: Takahashi FSQ-106 Fluorite + SBIG STX-16803
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- 106 mm f/5.0 Petzval refractor, 530 mm focal length
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- STX-16803 CCD, 3.5"/px, 238.8 x 238.8 arcmin (4 x 4 degrees)
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- Paramount ME, unguided; LRGB, 5 nm Ha/SII/OIII, V; minimum elevation 25 degrees
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**Review:** the classic mono widefield workhorse. Four square degrees on the square
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16803 sensor suits large nebula complexes (North America, Veil, Rho Ophiuchi) and
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mosaics. CCD rather than CMOS, so integration is slower than modern rivals, and
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dithering is recommended. Pick it for framed mono narrowband over T20's colour.
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### T20: Takahashi FSQ-106ED + ZWO ASI2400C (one-shot colour)
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- 106 mm f/5.0 Petzval refractor, 530 mm focal length
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- ASI2400C colour CMOS (Sony IMX410, full frame, 14-bit), 2.31"/px, 233.7 x 155.8 arcmin
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- Paramount ME, unguided; Optolong L-Pro and L-Ultimate (3 nm dual-band), Astrodon narrowband
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- Field rotated 90 degrees relative to T14 for alternative framing
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**Review:** the colour twin of T14 with a modern full-frame CMOS. The L-Ultimate
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dual-band filter is the clever bit: one-shot-colour narrowband on emission nebulae,
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even with the moon up. Sensor is 14-bit, so dynamic range trails the mono 16-bit
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scopes. The best low-effort widefield choice on the network.
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### T21: Planewave CDK17 + FLI PL6303E
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- 431 mm (17") f/4.5 corrected Dall-Kirkham with 0.66x reducer, 1940 mm
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- PL6303E CCD (NABG), 0.96"/px, 49.2 x 32.8 arcmin
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- Ascension 200HR; Astrodon LRGB, 5 nm narrowband, and UBVRI; minimum elevation 20 degrees
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**Review:** billed as a combined photometry and imaging system, and that is its niche:
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the sensitive NABG chip plus a full Johnson-Cousins set makes it a proper science
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scope. The same NABG sensitivity means blooming on bright subjects, so it rewards
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careful target and exposure choice rather than casual use.
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### T25: Planewave CDK20 + Player One Zeus 455M PRO
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- 508 mm (20") f/6.8 corrected Dall-Kirkham at native focal length, 3454 mm
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- Zeus 455M mono CMOS (Sony IMX455, full frame), 0.23"/px, 36.2 x 24.2 arcmin, 61 MP
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- Planewave L-500; Astrodon LRGB and 3 nm narrowband
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**Review:** the resolution monster. At 0.23"/px it is oversampled for almost any
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seeing, which means you can bin or drizzle as you please and still resolve fine
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structure in small galaxies and planetary nebulae. The cost is enormous files (61 MP
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per sub) and a narrow field. Choose it when the target is small and detail is the
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point.
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### T26: Planewave Delta Rho 500 + ZWO ASI6200MM Pro
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- 508 mm (20") f/3.0 corrected astrograph, 1537 mm focal length
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- ASI6200MM mono CMOS (IMX455, full frame, Bin2 only), 1.01"/px, 80.4 x 54.0 arcmin
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- Planewave L-550 on equatorial wedge; Chroma LRGB and 3 nm narrowband
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- Recommended subs: LRGB 30-180 s, narrowband 180-300 s (900 s available)
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**Review:** arguably the best imaging system on the network: half a metre of aperture
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at f/3.0 with a modern 91% QE sensor is a light bucket that reaches faint extended
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nebulosity (integrated flux nebulae, faint Ha shells) in a fraction of the usual
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integration time, over a 1.3-degree field. Bin2-only is a software limitation, not an
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optical one, and barely matters at this image scale.
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### T68: Celestron RASA 11 + ZWO ASI2600C (free, one-shot colour)
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- 279 mm (11") f/2.2 Rowe-Ackermann Schmidt astrograph, 620 mm focal length
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- ASI2600C colour CMOS (IMX571, APS-C), 1.25"/px, 130.2 x 87.0 arcmin
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- Paramount ME II, mount-guided, no filters; 30 minutes free per day
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**Review:** the free taster scope, and genuinely good: f/2.2 means even short free
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sessions produce satisfying colour images of bright nebulae and comets over a
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2-degree field. No filters and modest QE cap its ceiling. Ideal for trying the
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network, time-lapse of transients, or quick-look framing before booking a paid scope.
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---
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## Sierra Remote Observatory, California (MPC U69)
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High Sierra site with steady seeing; hosts the network's largest northern aperture.
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### T24: Planewave CDK24 + Player One Zeus 455M PRO
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- 610 mm (24") f/6.5 corrected Dall-Kirkham, 3962 mm focal length
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- Zeus 455M mono CMOS, 0.395"/px (Bin2), 31.6 x 21.1 arcmin
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- Ascension 200HR, external guiding beyond 300 s; Astrodon LRGB, 3 nm narrowband, V and Ic
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- Match subs to calibration set (60/120/180/300/600/900 s); minimum elevation 25 degrees
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**Review:** the northern flagship. The biggest glass in the northern half of the
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network on a steady-seeing site, with a modern high-QE sensor: first choice for small
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galaxies, quasar fields and faint photometry (V and Ic fitted). The operational notes
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(RBI flush, fixed exposure ladder, dithering) show it is run seriously for calibrated
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science data. Narrow field, so not for showpiece nebulae.
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---
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## Siding Spring Observatory, Australia (MPC Q62)
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The network's southern-hemisphere anchor, on the AAO site. The only access most users
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have to Magellanic Cloud and far-southern targets at serious aperture. Roof geometry
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limits northern views (horizon limits 35-75 degrees depending on scope).
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### T8: Takahashi FSQ-106ED + FLI Microline 16803
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- 106 mm f/5.0 Petzval refractor, 530 mm focal length
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- ML16803 CCD, 3.5"/px, 238.8 x 238.8 arcmin (4 x 4 degrees)
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- Paramount PME, external guiding; Astrodon LRGB, EXO, narrowband, NIR luminance
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- North horizon limit 75 degrees; dithering recommended (occasional dark columns)
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**Review:** the southern widefield essential: four square degrees on the LMC, SMC,
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Eta Carinae or the Gum Nebula is something no northern scope can offer. Same era of
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CCD as T14 with the same patience requirement, and its known dark-column quirk makes
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dithering effectively mandatory. Book it for large southern showpieces.
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### T17: Planewave CDK17 + ZWO ASI6200MM Pro
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- 432 mm (17") f/6.8 corrected Dall-Kirkham, 2939 mm focal length
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- ASI6200MM mono CMOS (Bin2 only), 0.53"/px, 42.4 x 28.3 arcmin
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- Paramount PME, unguided; Astrodon LRGB and 5 nm narrowband; minimum elevation 35 degrees
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**Review:** a modern deep-field machine pointed at the southern sky: 91% QE at half an
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arcsecond per pixel is a potent combination for southern galaxies (NGC 1365, Centaurus
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A) and planetary nebulae. The tight 35-degree elevation floor means plan targets near
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culmination.
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### T30: Planewave CDK20 + FLI PL6303E
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- 508 mm (20") f/4.4 corrected Dall-Kirkham with 0.66x reducer, 2262 mm
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- PL6303E CCD (NABG), 0.81"/px, 41.6 x 27.8 arcmin
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- Ascension 200HR; Astrodon LRGB, 5 nm narrowband, and full Johnson-Cousins UBVRcIc
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**Review:** the southern science scope: big aperture, fast reduced optics and the
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full photometric filter set. Same NABG blooming caveat as its northern siblings, and
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the CCD needs more integration than T17's CMOS for imaging, so treat it as
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photometry-first, imaging-second.
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### T32: Planewave CDK17 + ZWO ASI6200MM Pro
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- 431 mm (17") f/6.8 corrected Dall-Kirkham, 2912 mm focal length
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- ASI6200MM mono CMOS (Bin2 only), 0.53"/px, 42.4 x 28.3 arcmin
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- Ascension 200HR; Astrodon LRGB, 5 nm narrowband, plus V and Ic; minimum elevation 30 degrees
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**Review:** effectively T17's twin with a slightly friendlier elevation limit and V/Ic
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photometric filters added. If T17 is booked, this is the same capability; if you need
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magnitudes as well as pictures, prefer T32 of the pair.
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### T33: 12.5" RCOS Ritchey-Chretien + Apogee Alta U16 (free)
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- 320 mm (12.5") f/9.0 Ritchey-Chretien, 2885 mm focal length
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- Alta U16 CCD (NABG), 0.54"/px, 37 x 37 arcmin
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- Paramount ME, external guiding; Astrodon LRGB and narrowband
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- 30 minutes free per day; north horizon limit 45 degrees
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- Recommended: LRGB 300 s; narrowband 300 s Bin2 or 600 s Bin1 on calm nights
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**Review:** the free southern scope, and a much more serious instrument than "free"
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suggests: a proper RC with narrowband filters at 0.54"/px. The NABG CCD blooms on
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bright stars and f/9 is slow, so free 30-minute slots are best spent on compact,
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reasonably bright targets, or accumulated across nights.
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### T59: Planewave CDK20 + FLI ProLine 16803
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- 510 mm (20") f/6.8 corrected Dall-Kirkham, 3411 mm focal length
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- ProLine 16803 CCD, 0.54"/px, 37.2 x 37.2 arcmin
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- Ascension 200HR; Astrodon LRGB, 5 nm narrowband, Ic and Z; capable of 15-minute subs
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**Review:** deep and square: the 16803's square field at half-arcsecond sampling with
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an ABG chip rated for very long exposures. The scope to book for faint southern
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targets that need 900-second narrowband subs without blooming worries. QE is dated
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(60%), so it trades sensor efficiency for exposure headroom.
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---
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## Deep Sky Chile (MPC X07)
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Newest site, Atacama-quality southern skies; a modern all-CMOS lineup built around
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astrophotography.
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### T70: Samyang 135 mm f/3.5 + ZWO ASI2600MM Pro
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- 65 mm camera lens at f/3.5, 129 mm focal length
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- ASI2600MM mono CMOS (IMX571, APS-C), 4.51"/px, 469.8 x 355.2 arcmin (7.8 x 5.9 degrees)
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- Paramount ME, guided; Astrodon LRGB and narrowband; minimum elevation 0 degrees
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**Review:** an eight-degree mono narrowband field under Atacama skies, down to the
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horizon. Made for constellation-scale mosaics, the Gum Nebula, and the Milky Way core.
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It is a camera lens, so expect corner coma and halos on bright stars; that is the
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stated trade for the field of view.
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### T71: Takahashi Epsilon 180ED + ZWO ASI2600MM Pro
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- 180 mm f/2.8 hyperbolic Newtonian astrograph, 500 mm focal length
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- ASI2600MM mono CMOS, 1.55"/px, 161.4 x 108.0 arcmin
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- Paramount MyT, guided; Astrodon LRGB and 5 nm narrowband
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- Electronic shutter: no user darks; calibrated data supplied for standard sub lengths
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**Review:** the best fast-widefield system on the network: f/2.8 optics, a modern
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sensor and Chilean skies. A 2.7 x 1.8 degree field at 1.55"/px suits nearly every
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showpiece southern nebula. Subs are constrained to the standard calibration ladder
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(10-600 s) since you cannot take your own darks, and files are large (101 MiB).
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### T72: Planewave CDK20 + FLI ML-16200
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- 510 mm (20") f/6.8 corrected Dall-Kirkham, 3411 mm focal length
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- ML-16200 CCD, 0.359"/px, 26.9 x 21.5 arcmin
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- Planewave L-500; LRGB, narrowband, and U, B, V, R, I
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- Precision-scaled raw calibration frames published at data.itelescope.net (0-900 s)
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**Review:** the Chilean science workhorse: full UBVRI photometry, very fine sampling,
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and a published high-precision calibration pipeline aimed squarely at photometric
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work. The 39Ke full well is modest, so watch saturation on bright comparison stars.
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For pretty pictures the CMOS scopes on site are faster; for southern photometry this
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is the one.
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### T73: Planewave CDK14 + ZWO ASI2600MM Pro
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- 356 mm (14") f/7.2 corrected Dall-Kirkham, 2563 mm focal length
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- ASI2600MM mono CMOS, 0.31"/px, 31.8 x 21.0 arcmin
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- Paramount ME II, guided; Chroma LRGB and 3 nm narrowband
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**Review:** a fine-detail southern imager: 0.31"/px oversampling with a near-zero
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dark current sensor (darks essentially redundant) and tight 3 nm Chroma narrowband.
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The pick for small southern galaxies and planetaries when T25-style resolution is
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wanted below the celestial equator. Short 240 s max recommended subs keep runs simple.
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### T74: (in commissioning)
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Listed in the network sheet with no published specs yet.
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### T75: ASA N250 + ZWO ASI6200MM Pro
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- 250 mm f/3.8 Newtonian astrograph, 950 mm focal length
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- ASI6200MM mono CMOS (Bin2 only), 1.72"/px, 137.4 x 91.8 arcmin
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- Paramount MyT, guided; Chroma LRGB and 3 nm narrowband
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**Review:** the middle option at Deep Sky Chile: faster and wider than the CDKs,
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deeper than the Epsilon. A 2.3 x 1.5 degree field at f/3.8 with 91% QE makes quick
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work of medium-large southern nebulae. Bin2-only sampling is coarse but well matched
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to the focal length.
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---
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## AstroCamp Observatory, Spain (MPC I89)
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High-altitude site in the Spanish mountains; fills the European longitude gap so
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northern targets can be followed when America is in daylight.
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### T18: Planewave CDK12 + QHY600M
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- 318 mm (12.5") f/5.3 corrected Dall-Kirkham, 1683 mm focal length
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- QHY600M mono CMOS (IMX455, full frame, Bin2 only), 0.92"/px, 73.6 x 49.1 arcmin
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- Paramount PME, externally guided; Astrodon LRGB, 5 nm narrowband, photometric V and Ic
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- Minimum elevation 40 degrees
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**Review:** a well-balanced all-rounder: enough aperture for galaxies, a wide enough
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field (1.2 degrees) for most nebulae, modern sensor, and V/Ic for photometry. Its real
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value is longitude coverage for time-critical work (exoplanet transits, variable
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stars, GRB follow-up) from Europe. The 40-degree elevation floor is the strictest on
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the network, so target selection matters.
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---
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|
||||
## Entre Encinas y Estrellas (e-EyE), Spain
|
||||
|
||||
Hosting site in Extremadura; currently one iTelescope system.
|
||||
|
||||
### T80: Samyang 135 mm f/3.5 + ZWO ASI2600MM Pro
|
||||
|
||||
- 65 mm camera lens at f/3.5, 129 mm focal length
|
||||
- ASI2600MM mono CMOS, 5.98"/px, 622.2 x 415.8 arcmin (10.4 x 6.9 degrees)
|
||||
- Paramount MyT, guided; Astrodon LRGB and narrowband
|
||||
|
||||
**Review:** T70's northern sibling: a ten-degree mono field for constellation-scale
|
||||
imaging (whole of Orion's belt and sword in one frame, big Ha mosaics of Cygnus).
|
||||
Same camera-lens caveats on corner stars. Between this and T70 the entire sky is
|
||||
covered at super-wide field.
|
||||
|
||||
---
|
||||
|
||||
## Choosing a telescope
|
||||
|
||||
| Use case | First choice | Alternatives |
|
||||
|---|---|---|
|
||||
| Widefield narrowband, north | T14 (mono), T20 (colour dual-band) | T68 (free colour) |
|
||||
| Widefield narrowband, south | T71 | T8, T75 |
|
||||
| Constellation-scale mosaics | T80 (north), T70 (south) | |
|
||||
| Faint extended nebulosity | T26 | T75, T71 |
|
||||
| Small galaxies / fine detail, north | T24 | T25 |
|
||||
| Small galaxies / fine detail, south | T73 | T17, T32, T59 |
|
||||
| Photometry / science, north | T21, T24 | T5, T11, T18 |
|
||||
| Photometry / science, south | T72 | T30, T32 |
|
||||
| One-shot colour, minimum effort | T20 | T2, T68 |
|
||||
| Long (15 min) narrowband subs, south | T59 | |
|
||||
| European longitude / transit timing | T18 | |
|
||||
| Free / trying the network | T68 (north), T33 (south) | |
|
||||
|
||||
## General observations
|
||||
|
||||
- The network is mid-migration from legacy CCDs (16803, PL6303E, ST-10XME) to modern
|
||||
back-illuminated CMOS (IMX455, IMX571): the CMOS scopes reach the same depth in
|
||||
roughly half the integration time thanks to 85-91% peak QE, and several of the CCD
|
||||
systems (NABG chips especially) carry blooming caveats the CMOS ones do not.
|
||||
- Several CMOS systems are Bin2-only due to software limitations (T17, T18, T26, T32,
|
||||
T75). At their focal lengths this costs little real resolution.
|
||||
- Minimum elevation limits vary widely (0 degrees at T70 up to 40 degrees at T18) and
|
||||
are a real planning constraint, especially at Siding Spring where the roof blocks
|
||||
much of the northern sky.
|
||||
- Calibration is handled network-side on several scopes (T71's electronic shutter
|
||||
disallows user darks; T72 publishes precision-scaled calibration frames; T24 wants
|
||||
subs matched to its calibration ladder). Check the per-scope notes before planning
|
||||
exposures.
|
||||
78
data/itelescope-telescopes.csv
Normal file
78
data/itelescope-telescopes.csv
Normal file
|
|
@ -0,0 +1,78 @@
|
|||
Telescope,Platform,Aperture (in),Aperature (mm),Focal Length (mm),F-Ratio,Optical Tube Assembly,Optical Design,Camera,Sensor Type,CMOS Sensor Model,Sensor Size / Format (mm),"Camera Angle
|
||||
(""Up"" = Deg. East of N)",FOV X (arcmins),FOV Y (arcmins),Pixel Size (µm),Resolution (arcsec / pixel),Sensor Megapixels,Array X,Array Y,Peak QE,Full Well,N/ABG,Recommended Max Exposure (seconds),Guiding,Mount,Filters,Notes,"Additional System Specifications
|
||||
(e.g. horizon limits, special notes)"
|
||||
,Utah Desert Remote Observatory (MPC U94),,,,,,,,Note: Sensors generally have 16-bit ADCs unless other values are provided,,,,,,,,,,,,,,,,,,,
|
||||
T2,One Shot Color,5.9,150,1105.1,f/7.3,Takahashi TOA-150,Apochromatic Refractor,QHY268C,"Color CMOS
|
||||
(RGGB Bayer)",Sony IMX571,"23.5 x 15.7
|
||||
(APS-C)",178.683º,72.6,48.6,3.76,"0.69""",26.4,6280,4210,90%,51Ke,—,300,MOAG with Loadstar SX2,Paramount GTS,None,"Large (26 MP, 16-bit) FITS files",Telescope System Information and Specs
|
||||
T5,Medium Deep Space,9.8,250,850,f/3.4,Takahashi Epsilon 250,Hyperbolic Flat-Field,SBIG ST-10XME,CCD,—,14.9 x 10.0,177º,60.6,40.8,6.8,"1.66""",3.2,2184,1472,85%,100Ke,NABG,300,External Guiding,Paramount PME,"Red Green Blue, Ha, SII, OIII, Clear and Johnson's Cousin's Photometric B,V, and I filters.",Non Anti Bloom Gate (NABG) CCD. Bright stars will bloom or bleed in long exposures. Keep your exposures short if very bright stars are in your target FoV.,Telescope System Information and Specs
|
||||
T11,Deep Space,20.1,510,"2280
|
||||
(0.66 reducer)",f/4.5,Planewave CDK20,Corrected Dall-Kirkham,FLI ProLine PL11002M,CCD,—,"36 x 24
|
||||
(Full Format)",186.9º,54.3,36.2,9,"0.81""",10.7,4008,2672,51%,60Ke,ABG,600,Active Guiding Disabled,Planewave Ascension 200HR,"AstroDon - Luminance, Red, Green, Blue. 3nm Ha3_50R, Sii3_50R, Oiii_50R. U, B, V, R, I",Optics more sensitive to stray light gradients (e.g. during full moon),Telescope System Information and Specs
|
||||
T14,Wide Field,4.2,106,530,f/5.0,Takahashi FSQ Fluorite,Petzval Apochromatic Refractor,SBIG STX-16803,CCD,—,36.8 x 36.8,90º,238.8,238.8,9,"3.5""",16.8,4096,4096,60%,100Ke,ABG,600,Unguided,Paramount ME,"LRGB, Ha (5nm), SII(5nm), OIII(5nm), V Filters",Dithering recommended,Telescope System Information and Specs
|
||||
T20,Wide Field,4.2,106,530,f/5.0,Takahashi FSQ-ED,Petzval Apochromatic Refractor,ZWO ASI2400C,"Color CMOS
|
||||
(14-bit ADC)
|
||||
(RGGB Bayer)",Sony IMX410,"36 x 24
|
||||
(Full Format)",358.4º,233.7,155.8,5.94,"2.31""",24.5,6072,4042,>80%,50Ke,ABG,300,Unguided,Paramount ME,"Optolong Lpro, Optolong LUltimate (Ha/OIII 3nm dual band), Astrodon Ha (3nm), SII (3nm) & OIII (5nm)",FoV Rotated 90° relative to T14 for different framing opportunities.,Telescope System Information and Specs
|
||||
T21,Deep Space,17.0,431,"1940
|
||||
(0.66 reducer)",f/4.5,Planewave CDK17,Corrected Dall-Kirkham,FLI-PL6303E,CCD,—,27.6 x 18.4,359º,49.2,32.8,9,"0.96""",6.3,3072,2048,68%,100Ke,NABG,600,Active Guiding Disabled,Planewave Ascension 200HR,"Astrodon LRGB 50mm unmounted, Astrodon Ha, SII, OIII, 5nm, 50 mm unmounted, Astrodon UBVRI John/Cousins",Photometry and Imaging system. Sensitive NABG CCD - susceptible to blooming artifacts from bright subjects,Telescope System Information and Specs
|
||||
T25,Deep Space,20.0,508,3454,f/6.8,Planewave CDK20,Corrected Dall-Kirkham,Player One Zeus 455M PRO,Mono CMOS,Sony IMX455,"36 x 24
|
||||
(Full Format)",251.9º,36.2,24.2,3.76,"0.23""",61.2,9576,6388,91%,71.6Ke,—,600,None,Planewave L-500,"Astrodon LRGB Gen2 I-Series Tru-Balance filters, Astrodon 3nm SII,Ha,OIII",Produces very large files,Telescope System Information and Specs
|
||||
T26,Deep Space,20.0,508,1537,f/3.0,Planewave Delta Rho 500,Advanced Corrected Cassegrain Focus,ASI6200MM Pro (mono),Mono CMOS,Sony IMX455,"36 x 24
|
||||
(Full Format)",181º,80.4,54,7.52 (Bin2),"1.01""",15.3,4788,3194,91%,51.4Ke,—,300,None,Planewave L-550 on Equatorial Wedge,"Chroma Filters:
|
||||
Wideband: Luminance, Red, Green & Blue
|
||||
Narrowband: SII, Ha & OIII with a 3nm optimise passband","Bin2 only due to current software limitations
|
||||
Recommended Exposures: LRGB: 30s-180s.
|
||||
Narrowband: 180s-300s. 900s Available",Telescope System Information and Specs
|
||||
T68,"One Shot Color
|
||||
(30 min free / day)",11.0,279,620,f/2.2,"Celestron RASA 11""",Rowe Ackerman Schmidt Astrograph,ZWO ASI2600 Color,"Color CMOS
|
||||
(RGGB Bayer)",Sony IMX571,"23.6 x 15.6
|
||||
(APS-C)",277º,130.2,87,3.76,"1.25""",26.1,6248,4176,>50%,—,—,240,Via Mount,Paramount ME II,None,"Full-Time Free Telescope System
|
||||
Large (26 MP, 16-bit) FITS files",Telescope System Information and Specs
|
||||
,Sierra Remote Observatory (MPC U69),,,,,,,,,,,,,,,,,,,,,,,,,,,
|
||||
T24,Deep Space,24.0,610,3962,f/6.5,Planewave CDK24,Corrected Dall-Kirkham ,Player One Zeus 455M PRO,Mono CMOS,—,36 x 24,90.7º,31.6,21.1,7.52 (Bin2),"0.395""",15.3,4788,3194,91%,71.6Ke,—,600,External Guiding (300s+),Planewave Ascension 200HR,"Astrodon LRGB2-E50S
|
||||
Astrodon HA3_50S, OIII3_50S, SII3_50S.Astrodon V, I (V*-50S, Ic*-50S)","Best results on Bin1. Dithering highly recommended. Uses RBI Flush to prevent ghosting. Best to use 60, 120, 180, 300, 600 and 900s exposures to match with calibraiton data.",Telescope System Information and Specs
|
||||
,"Siding Springs Observatory, Australia (MPC Q62)",,,,,,,,,,,,,,,,,,,,,,,,,,,
|
||||
T8,Wide Field,4.2,106,530,f/5.0,Takahashi FSQ ED,Petzval Apochromatic Refractor,FLI Microline 16803,CCD,—,36.8 x 36.8,358º,238.8,238.8,9,"3.5""",16.8,4096,4096,60%,100Ke,ABG,600,External ,Paramount PME,"AstroDon Series 2
|
||||
Luminance, Red, Green, Blue, EXO, Ha, SII, OIII, NIR Luminance",Northern view is restricted by observatory roof. N Horizon limit is 75°. Dithering is recommended because T8's CCD sometimes produces dark columns. ,Telescope System Information and Specs
|
||||
T17,Deep Field Astrophotography,17.0,432,2939,f/6.8,Planewave CDK17,Corrected Dall-Kirkham ,ASI6200MM Pro (mono),Mono CMOS,Sony IMX455,"36 x 24
|
||||
(Full Format)",84.2º,42.4,28.3,7.52 (Bin2),"0.531""",15.3,4788,3194,91% (475nm),51.4Ke,—,240,Unguided,Paramount PME,"Astrodon: Luminance, Clear
|
||||
Astrodon: Red-E. Green-E. Blue-E
|
||||
Astrodon: Ha 5nm, 5nm OIII, 5nm, SII","NEW CMOS Camera for astrophotography
|
||||
Bin2 only due to software limitations",Telescope System Information and Specs
|
||||
T30,Deep Space,20.0,508,"2262
|
||||
(0.66 reducer)",f/4.4,Planewave CDK20,Corrected Dall-Kirkham ,FLI-PL6303E,CCD,—,27.6 x 18.4,270º,41.6,27.8,9,"0.81""",6.3,3072,2048,68%,100Ke,NABG,300,Active Guiding Disabled,Planewave Ascension 200HR,"AstroDon Tru-Balance Gen 2 E series Luminance, Red, Green, Blue, 5nm Ha, 5nm SII, 5nm OIII, and AstroDon Johnson/Cousins UvBVRcIc",Very sensitive NABG CCD - susceptible to blooming artifacts from bright subjects,Telescope System Information and Specs
|
||||
T32,Wide Deep Field,17.0,431,2912,f/6.8,Planewave CDK17,Corrected Dall-Kirkham ,ASI6200MM Pro (mono),Mono CMOS,Sony IMX455,"36 x 24
|
||||
(Full Format)",90º,42.4,28.3,7.52 (Bin2),"0.53""",15.3,4788,3194,91% (475nm),51.4Ke,—,300,Active Guiding Disabled,Planewave Ascension 200HR,"Astrodon E-Series Luminance Red, Green, Blue
|
||||
Astrodon 5nm Ha, SII, OIII
|
||||
Astrodon Johnson/Couisins V, Ic","NEW CMOS Camera for astrophotography
|
||||
Bin2 only due to software limitations",Telescope System Information and Specs
|
||||
T33,"Narrow Deep Field
|
||||
(30 min free / day)",12.6,320,2885,f/9.0,"Star Instruments 12.5"" RCOS",Ritchey-Chrétien - Closed Carbon Tube,Apogee Alta U16,CCD,—,36.8 x 36.8,359º,37,37,9,"0.54""",16.8,4096,4096,69%,100Ke,NABG,300,External Guiding,Paramount ME,"Astrodon Series II: Luminance, Red, Green, Blue
|
||||
Astrodon Ha (5nm), SII, OIII (3nm)
|
||||
","Full-Time Free Telescope System
|
||||
North Horizon limit is 45°
|
||||
Rec. exposures: LRGB at 300s. Narrowband at 300s Bin2, or 600s Bin1 on calm nights. ",Telescope System Information and Specs
|
||||
T59,Wide Deep Field,20.1,510,3411,f/6.8,Planewave CDK20,Corrected Dall-Kirkham ,FLI Proline 16803,CCD,—,36.8 x 36.8,90º,37.2,37.2,9,"0.54""",16.8,4096,4096,60%,> 100X Saturation Exposure,ABG,900,Active Guiding Disabled,Planewave Ascension 200HR,"Astrodon E-Series Luminance Red, Green, Blue
|
||||
Astrodon 5nm Ha, SII, OIII
|
||||
Astrodon Johnson/Couisins, IcZ",Capable of very long (15 min) exposures,Telescope System Information and Specs
|
||||
,Deep Sky Chile (MPC X07),,,,,,,,,,,,,,,,,,,,,,,,,,,
|
||||
T70,Super Wide Field,2.6,65,129,f/3.5,Samyang 135 mm @ f/3.5,Camera Lens,ASI2600MM Pro (mono),Mono CMOS,Sony IMX571,"23.5 x 15.7
|
||||
(APS-C)",314º,469.8,355.2,3.76,"4.51""",26.1,6248,4176,60%,50Ke,—,300,ZWO 30 F/4 guidescope with Loadstar SX2,Paramount ME,"Astrodon Gen 2 E-Series LRGB, Ha, OIII, SII","Note: Camera lens. Some residual coma occurs in the corners, and bright stars develop halos. This is normal and expected on this system. ",Telescope System Information and Specs
|
||||
T71,Wide Field Astrophotography,7.1,180,500,f/2.8,Takahashi Epsilon 180ED,Hyperbolic Corrected Newtonian Astrograph,ASI2600MM Pro (mono),Mono CMOS,Sony IMX571,"23.5 x 15.7
|
||||
(APS-C)",342.5º,161.4,108,3.76,"1.55""",26.1,6248,4176,60%,50Ke,—,600,QHY miniguidescope f4.3 with Loadstar Pro,Paramount MyT,"Astrodon Gen 2 I-Series LRGB, Ha (5nm), OIII (5nm), SII (5nm)","Electronic shutter. No user dark frames can be taken. Calibrated data available for 10, 30, 60, 120 180, 300, 600s.
|
||||
|
||||
Generates very large (26 MP, 101 MiB) FITS files",Telescope System Information and Specs
|
||||
T72,Deep Space,20.1,510,3411,F/6.8,Planewave CDK20,Corrected Dall-Kirkham,FLI ML-16200,CCD,—,27 x 21.6,176º,26.93,21.53,6,"0.359""",16.2,4500,3600,60%,39Ke,ABG,600,None,PlaneWave L-500,"L,R,G,B,SII,Ha,OIII,U,V,B,R,I filters",Raw calibration frames can be found at data.itelescope.net. (Bias Bin1 & Bin2 and Darks 900s Bin1 & 2 are scaled with high precision for photometry calibrated image data from 0 to 900 seconds).,Telescope System Information and Specs
|
||||
T73,Deep Field Astrophotography,14.0,356,2563,f/7.2,Planewave CDK14,Corrected Dall-Kirkham,ASI2600MM Pro (mono),Mono CMOS,Sony IMX571,"23.5 x 15.7
|
||||
(APS-C)",179.6º,31.8,21,3.76,"0.31""",26.1,6248,4176,60%,50Ke,—,240,WO Guide Star 61 f5.9 guide scope with Starlight Xpress Ultrastar Pro (mono) guide camera,Paramount MEII,"Chroma LRGB, Chroma 3nm Ha, OIII, SII",(the ASI2600MM has an extremely low dark current making darks virtually redundant),Telescope System Information and Specs
|
||||
T74,,,,,,,,,,,,,,,,,,,,,,,,,,,,
|
||||
T75,Medium Deep Space,9.8,250,950,f/3.8,ASA N250,Newtownian Astrograph,ASI6200MM Pro (mono),Mono CMOS,Sony IMX455,"36 x 24
|
||||
(Full Format)",88.3º,137.4,91.8,7.52 (Bin2),"1.722""",15.3,4788,3194,91%,50Ke,—,600,ZWO 30 F/4 guide scope with ASI290MM mini,Paramount MyT,"Chroma LRGB, Chroma 3nm Ha, OIII, SII",Bin2 only due to current software limitations.,Telescope System Information and Specs
|
||||
,"AstroCamp Observatory, Spain (MPC I89)",,,,,,,,,,,,,,,,,,,,,,,,,,,
|
||||
T18,Medium Deep Space,12.5,318,1683,f/5.3,Planewave CDK12,Corrected Dall-Kirkham ,QHY600M-PH-US Mono,Mono CMOS,Sony IMX455,"36 x 24
|
||||
(Full Format)",150º,73.6,49.1,7.52 (Bin2),"0.92"" (Bin2)",15.3,4788,3194,87%,> 38Ke,—,300,External via Lodestar SX and 300mm guidescope,Paramount PME,"Astrodon Series E LRGB. Astrodon 5nm Ha, SII, OIII. Photometric V (Custom Scientific Bessell) and Ic (Astrodon John/Cousins)","Bin2 only due to current software limitations.
|
||||
SONY Full Frame BSI CMOS Sensor IMX455",Telescope System Information and Specs
|
||||
,"Entre Encinas y Estrellas, Spain",,,,,,,,,,,,,,,,,,,,,,,,,,,
|
||||
T80,Super Wide Field,2.6,65,129,f/3.5,Samyang 135 mm @ f/3.5,Camera Lens,ASI2600MM Pro P25 (mono),Mono CMOS,Sony IMX571,"23.5 x 15.7
|
||||
(APS-C)",268º,622.2,415.8,3.76,"5.98""",26.1,6248,4176,60%,50Ke,—,300,ZWO 30 F/4 guidescope with Loadstar SX2 ,Paramount MyT,"Astrodon Gen 2 E-Series LRGB, Ha, OIII, SII",Note: Camera lens. Some residual coma occurs in the corners,Telescope System Information and Specs
|
||||
|
16
state/ARCHITECTURE.md
Normal file
16
state/ARCHITECTURE.md
Normal file
|
|
@ -0,0 +1,16 @@
|
|||
# Architecture
|
||||
|
||||
> How the system is built and why. Update this when the structure changes; a change is
|
||||
> not finished until this reflects it.
|
||||
|
||||
A documentation-only repo; there is no code.
|
||||
|
||||
- `TELESCOPES.md`: the deliverable. Per-observatory sections, one entry per telescope
|
||||
(spec bullets then a review paragraph), a "choosing a telescope" table, and general
|
||||
observations. Compiled from the sources below, dated in its header.
|
||||
- `data/itelescope-telescopes.csv`: verbatim CSV export of iTelescope's maintained
|
||||
specs Google Sheet. Treated as the source of truth for numbers; re-exported to
|
||||
refresh (see state/NOTES.md).
|
||||
- `state/`: Default Workflow project memory.
|
||||
- `CLAUDE.md` + `docs/`: the Default Workflow itself, copied from the
|
||||
Default-Workflow repo so the project is self-contained.
|
||||
31
state/DECISIONS.md
Normal file
31
state/DECISIONS.md
Normal file
|
|
@ -0,0 +1,31 @@
|
|||
# Decisions
|
||||
|
||||
> A dated, append only log of decisions and their rationale. Newest at the top. Never
|
||||
> rewrite past entries; if a decision is reversed, add a new entry that says so.
|
||||
|
||||
## 2026-07-17: follow the Google Sheet, not the support article
|
||||
|
||||
The support article (https://support.itelescope.net/support/solutions/articles/247371)
|
||||
and the maintained Google Sheet
|
||||
(https://docs.google.com/spreadsheets/d/1jZWkkjewOuyNC9YzQ8y2d0pO1e4T7EBeysmQMPBVSOk/)
|
||||
disagree: the article lists T9, T19, T31, T69, which the sheet omits; the sheet has
|
||||
T25, T26, T59, T71-T75, T80, which the article lacks. The article itself points to
|
||||
the sheet as the current source, so the review follows the sheet and notes the
|
||||
discrepancy. The sheet CSV export is snapshotted in data/ so the review's numbers
|
||||
remain reproducible even if the sheet changes.
|
||||
|
||||
## 2026-07-17: single review document, not per-telescope files
|
||||
|
||||
23 active scopes each need only a spec block and a short assessment; one TELESCOPES.md
|
||||
grouped by observatory reads better and is easier to keep current than 23 stub files.
|
||||
Revisit if per-scope content grows (photos, session logs).
|
||||
|
||||
## 2026-07-17: no launchpad scraping
|
||||
|
||||
https://go.itelescope.net/ is an authenticated app shell with no public data. All
|
||||
content comes from public support pages and the public sheet; nothing in this repo
|
||||
requires iTelescope credentials.
|
||||
|
||||
Per-telescope detail pages, if ever needed:
|
||||
support.itelescope.net/support/solutions/articles/231901-231920 (older scopes),
|
||||
245471 (T68), 251171 (T70), 251556 (T69), 251589 (T19).
|
||||
12
state/NOTES.md
Normal file
12
state/NOTES.md
Normal file
|
|
@ -0,0 +1,12 @@
|
|||
# Notes
|
||||
|
||||
> Working notes, gotchas, environment quirks, and dead ends to avoid. Free form. The
|
||||
> point is to save a future session from rediscovering something the hard way.
|
||||
|
||||
- Refresh the specs snapshot with:
|
||||
`curl -sL "https://docs.google.com/spreadsheets/d/1jZWkkjewOuyNC9YzQ8y2d0pO1e4T7EBeysmQMPBVSOk/export?format=csv" -o data/itelescope-telescopes.csv`
|
||||
- The CSV has multi-line cells (quoted); line count is not row count. Telescope rows
|
||||
start `T<number>,`; observatory header rows have an empty first column.
|
||||
- Sensors are 16-bit ADC unless noted (T20's ASI2400C is 14-bit).
|
||||
- Free scopes (30 min/day): T68 (Utah), T33 (Siding Spring).
|
||||
- Minimum elevation limits come from the support article, not the sheet.
|
||||
35
state/PR_TEMPLATE.md
Normal file
35
state/PR_TEMPLATE.md
Normal file
|
|
@ -0,0 +1,35 @@
|
|||
# <feature title>
|
||||
|
||||
> Fill this in when opening the PR. It is the summary a later documentation session
|
||||
> reads to write the docs, so make it complete and self contained.
|
||||
|
||||
## Feature
|
||||
|
||||
<What was built, in plain terms.>
|
||||
|
||||
## What was achieved
|
||||
|
||||
<The outcome. What now works that did not before.>
|
||||
|
||||
## How to verify
|
||||
|
||||
<Steps or commands to confirm it works.>
|
||||
|
||||
## Tools used
|
||||
|
||||
<Languages, libraries, commands, services involved.>
|
||||
|
||||
## How it works
|
||||
|
||||
<Enough detail for a documentation session to start from this PR alone: the approach,
|
||||
the key files, and how the pieces connect.>
|
||||
|
||||
## State updated
|
||||
|
||||
- [ ] `state/TODO.md`
|
||||
- [ ] `state/DECISIONS.md` (if a decision was made)
|
||||
- [ ] `state/ARCHITECTURE.md` (if the structure changed)
|
||||
|
||||
## Follow ups
|
||||
|
||||
<Anything deferred or worth doing next.>
|
||||
25
state/TODO.md
Normal file
25
state/TODO.md
Normal file
|
|
@ -0,0 +1,25 @@
|
|||
# TODO
|
||||
|
||||
> The current state of play. Keep it honest and current; this is what the next session
|
||||
> reads to know what to do. Move items between sections as they progress.
|
||||
|
||||
## Done
|
||||
|
||||
- 2026-07-17: repo created on git.discworld.casa, Default Workflow scaffold copied in.
|
||||
- 2026-07-17: specs sheet snapshotted to data/itelescope-telescopes.csv (24 scopes).
|
||||
- 2026-07-17: TELESCOPES.md written: per-scope reviews for all 23 active telescopes
|
||||
plus a choosing guide (T74 noted as in commissioning, no specs published).
|
||||
|
||||
## In progress
|
||||
|
||||
- (nothing)
|
||||
|
||||
## Pending
|
||||
|
||||
- Fill in T74 when iTelescope publishes its specs.
|
||||
- Reconcile the retired scopes (T9, T19, T31, T69): the support article still lists
|
||||
them but the maintained sheet does not; confirm status and note it.
|
||||
- Optional: per-telescope detail pages on support.itelescope.net (links in
|
||||
DECISIONS.md) hold photos and operational history if deeper entries are ever wanted.
|
||||
- Periodic refresh: re-export the Google Sheet and diff against data/ to catch new or
|
||||
changed systems.
|
||||
Loading…
Add table
Add a link
Reference in a new issue