| NGC 891 | |
|---|---|
 NGC 891 | |
| Observation data (J2000 epoch) | |
| Constellation | Andromeda |
| Right ascension | 02h 22m 33.4s[1] |
| Declination | +42° 20′ 57″[1] |
| Redshift | 528 ± 4 km/s[1] |
| Distance | 27.3 ± 1.8 Mly (8.4 ± 0.5 Mpc)[2] |
| Apparent magnitude (V) | 10.8[1] |
| Characteristics | |
| Type | SA(s)b?[1] |
| Apparent size (V) | 13′.5 × 2′.5[1] |
| Other designations | |
| UGC 1831, PGC 9031,[1] Caldwell 23 | |
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.[3] The galaxy is a member of the NGC 1023 group of galaxies in the Local Supercluster. It has an H II nucleus.[4]
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.
In 1999, the Hubble Space Telescope imaged NGC 891 in infrared.
In 2005, due to its attractiveness and scientific interest, NGC 891 was selected to be the first light image of the Large Binocular Telescope.[5][6] In 2012, it was again used as a first light image of the Lowell Discovery Telescope with the Large Monolithic Imager.[7]
Supernova SN 1986J was discovered on August 21, 1986 at apparent magnitude 14.[8]
- ^ a b c d e f g "NASA/IPAC Extragalactic Database". Results for NGC 891. Retrieved 2006-11-18.
- ^ J. L. Tonry; A. Dressler; J. P. Blakeslee; E. A. Ajhar; et al. (2001). "The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances". Astrophysical Journal. 546 (2): 681–693. arXiv:astro-ph/0011223. Bibcode:2001ApJ...546..681T. doi:10.1086/318301. S2CID 17628238.
- ^ Seligman, Courtney. "NGC 891". Celestial Atlas. Retrieved 8 November 2018.
- ^ Ho, Luis C.; Filippenko, Alexei V.; Sargent, Wallace L. W. (October 1997). "A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies". Astrophysical Journal Supplement. 112 (2): 315–390. arXiv:astro-ph/9704107. Bibcode:1997ApJS..112..315H. doi:10.1086/313041. S2CID 17086638.
- ^ "First Light Information". Large Binocular Telescope Observatory. 2008. Archived from the original on 9 July 2013. Retrieved 10 January 2015.
- ^ "LBT "First Light" Image of NGC 891". Archived from the original on 2015-02-28. Retrieved 2015-02-28.
- ^ Vitron, Tom. "Lowell's NSF-funded Large Monolithic Imager sees first light". Lowell Observatory. Archived from the original on 2 November 2012. Retrieved 27 September 2012.
- ^ "List of Supernovae". Harvard-Smithsonian Center for Astrophysics (IAU). Retrieved 2010-05-19.