NGC 78 is a pair of galaxies in the constellation Pisces.[2] NGC 78A, which is the more southern galaxy, is a barred spiral galaxy.[2] NGC 78B, which is the more northern galaxy, is an elliptical galaxy.[4] Although the designations NGC 78A and 78B are used today, the designation NGC 78 was formerly used mainly for the northern galaxy.[5]
| NGC 78 | |
|---|---|
 SDSS image of NGC 78A (bottom right) and 78B (top left) | |
| Observation data (J2000 epoch) | |
| Constellation | Pisces |
| Right ascension | 00h 20m 27.482s[1] |
| Declination | +00° 50′ 00.96″[1] |
| Redshift | 0.018283[2] |
| Heliocentric radial velocity | 5079 km/s[2] |
| Apparent magnitude (B) | 14.5[3] |
| Characteristics | |
| Type | SB0/a?(r)[2] |
| Size | 84,100 ly (25,790 pc)[2][note 1] |
| Apparent size (V) | 1.3′ × 0.897′[2][note 1] |
| Other designations | |
| NGC 78A: UGC 193, MGC+00-02-004, PGC 1306[3] NGC 78B: UGC 194, MGC+00-02-005, PGC 1309[4] | |
Discovery
editNGC 78 was discovered no later than 1876 by Carl Frederick Pechüle.[5] It was described as "very faint, small, round" by John Louis Emil Dreyer, the compiler of the New General Catalogue.[5] Because the two galaxies have different recessional velocities, the two galaxies are most likely not interacting.[5]
References
edit- ^ a b Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331.
- ^ a b c d e f g "NED results for object NGC 0078A". National Aeronautics and Space Administration / Infrared Processing and Analysis Center. Retrieved 6 September 2017.
- ^ a b "NGC 78A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 6 September 2017.
- ^ a b "NGC 78B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 6 September 2017.
- ^ a b c d "New General Catalog Objects: NGC 50 - 99". cseligman.com. Retrieved 6 September 2017.
Notes
editExternal links
edit
Media related to NGC 78 at Wikimedia Commons
