NGC 7720
| Galaxy NGC 7720 |
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|---|---|
![NGC 7720 with LEDA 71991 (?), LEDA 85575, LEDA 85570, 2MASX J23382548 + 2701496, LEDA 85563 (from left to right) [1]](https://de.wikipedia.org/wiki/Datei:NGC7720_-_SDSS_DR14.jpg)
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| NGC 7720 with LEDA 71991 (?) , LEDA 85575 , LEDA 85570, 2MASX J23382548 + 2701496 , LEDA 85563 (vLnR) | |
| AladinLite | |
| Constellation | Pegasus |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 23 h 38 m 29.385 s |
| declination | + 27 ° 01 ′ 53.25 ″ |
| Appearance | |
| Morphological type | cD; E + / LERG / Sy1 |
| Brightness (visual) | 12.3 mag |
| Brightness (B-band) | 13.4 mag |
| Angular expansion | 1.6 '× 1.3' |
| Position angle | 18 ° |
| Surface brightness | 13.1 mag / arcmin² |
| Physical data | |
| Affiliation | Abell 2634 WBL 721 |
| Redshift | 0.030221 ± 0.000047 |
| Radial velocity | 9060 ± 14 km / s |
|
Stroke distance v rad / H 0 |
(413 ± 29) · 10 6 ly (126.6 ± 8.9) Mpc |
| history | |
| discovery | William Herschel |
| Discovery date | September 10, 1784 |
| Catalog names | |
| NGC 7720 • UGC 12716 • PGC 71985 • CGCG 476-091 • MCG + 04-55-036 • GC 4996 • H III 146 • h 2259 • 2MASS J23382938 + 2701532 • GALEX ASC J233829.38 + 270155.6 • KPG 588 | |
NGC 7720 is a CD galaxy with an active nucleus of the Hubble type E2 in the constellation Pegasus in the northern sky . It is estimated to be 413 million light years from the Milky Way and approximately 195,000 light years in diameter. Together with PGC 85570 ( NGC 7720B ), it forms an interacting pair of galaxies.
In the same area of the sky are u. a. the galaxies NGC 7726 , NGC 7728 , IC 5341 , IC 5342 .
The object was discovered by Wilhelm Herschel on September 10, 1784 .
