NGC 7640 is a barred spiral galaxy in the constellation of Andromeda. Discovered on October 17, 1786, by the English astronomer William Herschel, NGC 7640 is an 11th magnitude barred spiral galaxy. Also known as LEDA 71220, UGC 12554 and IRAS 23197+4034, this galaxy is located in the constellation Andromeda, 38.8 million light-years from Earth. Galaxies of this type are recognizable by their spiral arms, which fan out not from a circular core, but from an elongated bar cutting through the galaxy's centre. NGC 7640 might not look much like a spiral, but this is due to the orientation of the galaxy with respect to an observer on Earth. There is evidence that this galaxy has experienced an interaction with another galaxy in the (astronomically) recent past.[2]
| NGC 7640 | |
|---|---|
 NGC 7640 (photographed by the Hubble Space Telescope | |
| Observation data (J2000 epoch) | |
| Constellation | Andromeda |
| Right ascension | 23h 22m 06.58s[1] |
| Declination | +40° 50′ 43.5″[1] |
| Redshift | 0.001231 ± 0.000004[1] |
| Heliocentric radial velocity | +369 ± 1 km/s[1] |
| Distance | 29.72 ± 0.5 Mly[1] |
| Apparent magnitude (V) | 11.1 |
| Absolute magnitude (V) | 11.86[1] |
| Characteristics | |
| Type | SB(s)c |
| Apparent size (V) | 10.5′ × 2′[1] |
| Other designations | |
| NGC 7640 | |
It is not immediately obvious this is a spiral galaxy from the photograph because it is edge on.[2]
References edit
External links edit
Media related to NGC 7640 at Wikimedia Commons
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