NGC 721
| Galaxy NGC 721 |
|
|---|---|
|
|
| AladinLite | |
| Constellation | Andromeda |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 01 h 54 m 45.4 s |
| declination | + 39 ° 23 ′ 01 ″ |
| Appearance | |
| Morphological type | SB (rs) bc |
| Brightness (visual) | 13.3 mag |
| Brightness (B-band) | 14.1 mag |
| Angular expansion | 1.7 ′ × 1 ′ |
| Position angle | 135 ° |
| Surface brightness | 13.7 mag / arcmin² |
| Physical data | |
| Redshift | 0.018670 +/- 0.000033 |
| Radial velocity | 5597 +/- 10 km / s |
|
Stroke distance v rad / H 0 |
(256 ± 18) · 10 6 ly (78.6 ± 5.5) Mpc |
| history | |
| discovery | Heinrich Louis d'Arrest |
| Discovery date | August 27, 1862 |
| Catalog names | |
| NGC 721 • UGC 1376 • PGC 7097 • CGCG 522-056 • MCG + 06-05-43 • IRAS 01517 + 39087 • 2MASX J01544546 + 3923006 • GC 433 • | |
NGC 721 is a barred spiral galaxy in the constellation Andromeda , which is about 256 million light years from the Milky Way .
It was discovered on August 27, 1862 by the German-Danish astronomer Heinrich Louis d'Arrest .
Web links
- SIMBAD Astronomical Database
- Auke Slotegraaf: NGC 721. Deep Sky Observer's Companion, accessed November 7, 2015 .