| NGC 7280 | |
|---|---|
 NGC 7280 imaged bySloan Digital Sky Survey | |
| Observation data (J2000epoch) | |
| Constellation | Pegasus |
| Right ascension | 22h 26m 27.5764s[1] |
| Declination | +16° 08′ 53.493″[1] |
| Redshift | 0.006164 ± 0.000013[1] |
| Heliocentric radial velocity | 1,848 ± 4 km/s[1] |
| Distance | 75.5 ± 7.1Mly (23.15 ± 2.2Mpc)[1] |
| Apparent magnitude (V) | 12.1[2] |
| Characteristics | |
| Type | SAB(r)0+[1] |
| Size | ~48,000 ly (14.7 kpc) (estimated)[1] |
| Apparent size (V) | 2.2′ × 1.5′[1] |
| Other designations | |
| UGC 12035,MCG +03-57-005,PGC 68870,CGCG 452-011[1] | |
NGC 7280 is alenticular galaxy in the constellationPegasus. The galaxy lies about 75 millionlight years away from Earth, which means, given its apparent dimensions, that NGC 7280 is approximately 50,000 light years across.[1] It was discovered byWilliam Herschel on October 15, 1784.[3]
NGC 7280 is a lenticular galaxy which is noted for having an inner gaseouspolar ring.[4] Dust lanes or rings are visible around the nucleus perpendicular to the major axis of the galaxy.[5] The stellar population in the nucleus is younger than the surrounding area, with an estimated age of 1.5 ± 0.5 billion years, and has highermetallicity. A circumnuclear stellar disk about 1 arcsecond across has been detected by theHubble Space Telescope.[6] The galaxy also features an intermediate bar.[6][7] Beyond the central region the gas and stars counter-rotate. The gas is also asymmetrically distributed. The gas was probably accreted recently because it exhibits shock-waveexcitation. There is no activestar formation detectable and there is noH-alpha emission from the nucleus.[4] The galaxy is rich in hydrogen, with an estimated hydrogen mass of109 M☉.[6]
NGC 7280 is the foremost galaxy of the NGC 7280 Group, along with PGC 141021, UGCA 429, and UGC 12090.[8] NGC 7280 interacts with UGCA 429, which lies 3.8 arcminutes away, as there is a hydrogen tail extending from the opposite side from NGC 7280.[9]
