HCG 92
HCG92 - NGC 7317, NGC 7318A/B, NGC 7319, NGC 7320
5’ x 5’ | 0.3”/px | 1000 × 1000 px
Pegasus
RA 22h 36m 00s DEC +34° 57’ 57”
HCG92 is a compact quintet located in the constellation Pegasus. It is also referred to as Stephan’s Quintet and a member of the Arp catalogue of Peculiar Galaxies, under number Arp319. At a distance of 37 million light-years, HCG92a is located much closer to earth than the other four and is standing completely on its own. It has some extensive HII regions. The remaining four galaxies are an actual compact group of galaxies and are expected to merge in the end. An interesting couple is HCG92b and HCG92d, which are heavily interacting, resulting in a complex spiral-like structure with two nuclei. A photograph of this galaxy group was part of the first set of photos released from the James Webb Space Telescope. Details of all five galaxies are listed in the table below.
This photo is generated from luminance data that was captured for the LRGB version of Arp319 which can be found here.
Hickson classification: SII - Group diameter: 3.2’
Group diameter according to Hickson, horizontal bar is 1 arcmin
| Ltr | Primary Designation | Also Known As | Type | RA (J2000) | Dec (J2000) | Distance (Mly) | Angular Size | App. Mag. (B) |
|---|---|---|---|---|---|---|---|---|
| a | NGC 7320 | MCG+06-49-042 · PGC 69270 | SAc | 22h 36m 03s | +33° 56′ 53″ | ~37 | 2.34′ × 1.29′ | 13.2 |
| b | NGC 7318B | MCG+06-49-040 · PGC 69263 | SB | 22h 35m 58s | +33° 57′ 58″ | ~277 | 1.1′ × 0.6′ | 14.1 |
| c | NGC 7319 | MCG+06-49-041 · PGC 69269 | SB | 22h 36m 04s | +33° 58′ 33″ | ~323 | 1.62′ × 1.07′ | 14.6 |
| d | NGC 7318A | MGC+06-49-039 · PGC 69260 | E | 22h 35m 57s | +33° 57′ 56″ | ~320 | 0.6′ × 0.5′ | 14.4 |
| e | NCG 7317 | MCG+06-49-038 · PGC 69256 | E4 | 22h 35m 52s | +33° 56′ 42″ | ~318 | 0.83′ × 0.79′ | 14.6 |
Imaging
Visibility graph at location: Remote hosting facility IC Astronomy in Oria, Spain (37°N 2°W)
| Telescope | Planewave CDK14 (2563mm @ f/7.2) |
| Mount | 10Micron GM2000HPS |
| Camera | Moravian C3-61000 Pro |
| Filters | Chroma 2" Luminance |
| Software | Voyager, MW4, PixInsight |
| Capture date(s) | 9-11, 14, 15, 27, 28, 30 July and 1-3 August 2024 |
| Settings | -10°C, gain 0, bin 1 |
| Exposure | 196 × 180s · (9h 48m) |
| Filters | Chroma 2" Luminance |
| Processing | WBPP, DBE, BXT, MAS, LHE, NXT, invert, crop |