NGC 997 is an interacting galaxy in the constellation of Cetus. The galaxy was discovered by Albert Marth on 10 November 1863.[3] It has a regularly rotating central molecular gas disk, containing a black hole of between 4 x 107 and 1.8 x 109 solar masses.[4] Its speed relative to the cosmological background is 6,270 ± 45 km/s, corresponding to a Hubble distance of 92.5 ± 6.5 Mpc (~302 million ly).[5]
| NGC 997 | |
|---|---|
 NGC 997 and its neighbouring galaxies captured by SDSS | |
| Observation data (J2000 epoch) | |
| Constellation | Cetus |
| Right ascension | 02h 37m 14.50s |
| Declination | ±07° 18′ 28″ |
| Redshift | 0.021688 |
| Heliocentric radial velocity | 6504 km/s |
| Distance | 86.92 Mpc |
| Group or cluster | [CHM2007] HDC 157, [CHM2007] LDC 181, [T2015] nest 200334 |
| Characteristics | |
| Type | E[1] |
| Other designations | |
| NGC 997, MCG+01-07-016, Z 414-27, [CHM2007] LDC 181 J023714.47+0718201, IRAS F02345+0705, NPM1G +07.0083, Z 0234.6+0705, LEDA 9932, UGC 2102, [CCA99] UGC 2102b, 2MASX J02371447+0718201, UZC J023714.4+071822, [CHM2007] HDC 157, J023714.47+0718201 | |
NGC 997 is accompanied by PGC 200205 also designated as NGC 997 NED01,[6] a compact galaxy. No data is available for the latter galaxy. So, this pair may be due to an optical alignment, or they may be two gravitationally interacting galaxies about to merge.
See also
References
External links
Media related to NGC 997 at Wikimedia Commons
