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NGC 891 (also known as Caldwell 23, the Silver Sliver Galaxy, and the Outer Limits Galaxy) is an edge-on unbarred spiral galaxy about 30 million light-years away in the constellation Andromeda. It was discovered by William Herschel on October 6, 1784. The galaxy is a member of the NGC 1023 group of galaxies in the Local Supercluster. It has an H II nucleus. The object is visible in small to moderate size telescopes as a faint elongated smear of light with a dust lane visible in larger apertures. |
| Object | NGC 891 - Galaxy |
|---|---|
| Constellation: | Andromeda |
| Position: | RA 02h 22m 33.4s DEC +42° 20′ 57″ |
| Apparent Size: | 13.5 × 2.5 arcmin |
| Apparent Magnitude/surface brightness: | 10.8 |
| Distance (average) | 27 Mly |
| Photo Datas | |
| Date | 26.10.2019, 21:00 UTC |
| Location | Knottenried/Oberallgäu, 1002m ASL GPS: 47°36’13“ N, 10°11’24“ E |
| Sky darkness SQM-L | Zenit 21.0mag/sqrsec, Object 20.9mag/sqrsec |
| Ground Temp./Air Pressure | 10.7°C /1020mbar |
| Thermal sky temp./weather | -51°C Zenit |
| Seeing | 4/10 |
| Telescope | TS RC 14" 2845mm f/8.0 |
| Camera | Sony A7Ra mod @ T sensor=14.0°C |
| Expose frames | ISO 3200, RAW 20x90s, 18 darks |
| Total expose |
30 min |
| Filter | no |
| Mount | HPS 10Micron GM 3000 |
| Guiding Cam | no |
| Software | DSS 3.3.4, Photoshop CC |
| Remarks |
C 2019 Peter Cerveny