|Observation data (J2000 epoch)|
|Right ascension||06h 44m 49.1s|
|Declination||−27° 38′ 19″|
|Redshift||0.006334 +/- 0.000010 |
|Helio radial velocity||1899 ± 3 km/s|
|Distance||74.6 ± 16 Mly (22.9 ± 5.0 Mpc)|
|Apparent magnitude (V)||10.5|
|Apparent size (V)||6′.3 × 3′.1|
|UGCA 131, ESO 427- G 002, AM 0642-273, MCG -05-16-020, PGC 19531|
NGC 2280 is a spiral galaxy located in the constellation Canis Major. It is located at a distance of circa 75 million light years from Earth, which, given its apparent dimensions, means that NGC 2280 is about 135,000 light years across. It was discovered by John Herschel on February 1, 1835. One supernova has been observed in NGC 2280, SN 2001fz, a type II supernova discovered by the Beijing Astronomical Observatory Supernova Survey on November 15, 2001. It had a peak magnitude of 17.4.
NGC 2280 has a small bright nucleus. The spiral arms emanate from the bulge and are narrow and of high surface magnitude in the inner part of the disk. At the outer disk the arms become broader and of lower surface magnitude and appear to have more knots. The east arm can be traced through ∼540° while the west one fades after ∼360°. The spiral pattern of the galaxy is undisturbed, with regular flow pattern and no evidence for a bar or oval distortion. In the nucleus of NGC 2280 lies a supermassive black hole whose mass is estimated to be between 4 and 15 million M☉ (106.88 ± 0.31 M☉) by measuring the galaxy's pitch angle.
NGC 2280 belongs to the NGC 2280 galaxy group, also known as LGG 138. Other members of the group are the possibly merging lenticular galaxies NGC 2292 and NGC 2293, NGC 2295, ESO 490−G010 and ESO 490−G045. Because of its large angular diameter, about one degree, the group was identified when redshift information were available, by Garcia et al, in 1993. Although there are some smaller galaxies near NGC 2280 that based on redshift could be its companions, there are no significant indications of recent interactions or tidal distortions, like warps. Gerard de Vaucouleurs had placed NGC 2280 in the same group with NGC 2139, NGC 2207, NGC 2217, and NGC 2223.
- "NASA/IPAC Extragalactic Database". Results for NGC 2280. Retrieved 2016-01-18.
- Seligman, Courtney. "NGC 2280 (= PGC 19531)". Celestial Atlas. Retrieved 19 November 2018.
- "Circular No. 7759". Central Bureau for Astronomical Telegrams. International Astronomical Union. 21 November 2001.
- "Circular No. 7753". Central Bureau for Astronomical Telegrams. International Astronomical Union. 17 November 2001.
- List of Supernovae IAU Central Bureau for Astronomical Telegrams. Retrieved 29 December 2015.
- Eskridge, Paul B.; Frogel, Jay A.; Pogge, Richard W.; Quillen, Alice C.; Berlind, Andreas A.; Davies, Roger L.; DePoy, D. L.; Gilbert, Karoline M.; Houdashelt, Mark L.; Kuchinski, Leslie E.; Ramirez, Solange V.; Sellgren, K.; Stutz, Amelia; Terndrup, Donald M.; Tiede, Glenn P. (November 2002). "Near‐Infrared and Optical Morphology of Spiral Galaxies". The Astrophysical Journal Supplement Series. 143 (1): 73–111. doi:10.1086/342340.
- Mitchell, Carl J.; Williams, T. B.; Spekkens, Kristine; Lee-Waddell, K.; Naray, Rachel Kuzio de; Sellwood, J. A. (2 March 2015). "The Rings Survey. I. Hα and H I Velocity Maps of Galaxy NGC 2280". The Astronomical Journal. 149 (3): 116. Bibcode:2015AJ....149..116M. doi:10.1088/0004-6256/149/3/116.
- Davis, Benjamin L.; Berrier, Joel C.; Johns, Lucas; Shields, Douglas W.; Hartley, Matthew T.; Kennefick, Daniel; Kennefick, Julia; Seigar, Marc S.; Lacy, Claud H. S. (20 June 2014). "The Black Hole Mass Function Derived from Local Spiral Galaxies". The Astrophysical Journal. 789 (2): 124. doi:10.1088/0004-637X/789/2/124.
- Barnes, D. G.; Webster, R. L. (July 2001). "A study of neutral hydrogen in five small galaxy groups". Monthly Notices of the Royal Astronomical Society. 324 (4): 859–876. doi:10.1046/j.1365-8711.2001.04273.x.
- de Vaucouleurs, G. (1975). "NEARBY GROUPS OF GALAXIES". Galaxies and the Universe. University of Chicago Press.