NGC 7715
| Galaxy NGC 7715 |
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|---|---|
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| Photo from the Hubble Space Telescope : NGC 7715 is at the top left, NGC 7714 is at the bottom right. | |
| AladinLite | |
| Constellation | fishes |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 23 h 36 m 22.1 s |
| declination | + 02 ° 09 ′ 23 ″ |
| Appearance | |
| Morphological type | In the? pec |
| Brightness (visual) | 14.1 mag |
| Brightness (B-band) | 14.7 mag |
| Angular expansion | 2.70 × 0.4 |
| Position angle | 73 ° |
| Surface brightness | 14.0 mag / arcmin² |
| Physical data | |
| Affiliation | LGG 479 |
| Redshift | 0.009243 +/- 0.000013 |
| Radial velocity | 2771 +/- 4 km / s |
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Stroke distance v rad / H 0 |
(129 ± 8) · 10 6 ly (39.7 ± 2.4) Mpc |
| diameter | 100,000 ly |
| history | |
| discovery | Bindon Stoney |
| Discovery date | November 4, 1850 |
| Catalog names | |
| NGC 7715 • UGC 12700 • PGC 71878 • 2MASX J23362176 + 0209252 • Arp 284 • VV 51b • | |
NGC 7715 is an irregular galaxy of Hubble type in? pec in the constellation Pisces on the ecliptic . It is about 129 million light years away from the Milky Way and about 100,000 light years in diameter .
Due to a close encounter with its neighboring galaxy NGC 7714 about 100 to 200 million years ago, it lost a considerable part of its mass, which led to distortions in both galaxies. Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy pair belongs to the class double galaxies with inflow and attraction .
The object was discovered on November 4, 1850 by Bindon Blood Stoney