NGC 731
| Galaxy NGC 731 / NGC 757 |
|
|---|---|
|
|
| SDSS recording | |
| AladinLite | |
| Constellation | whale |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 01 h 54 m 56.2 s |
| declination | -09 ° 00 ′ 39 ″ |
| Appearance | |
| Morphological type | E + : |
| Brightness (visual) | 12.1 mag |
| Brightness (B-band) | 13.1 mag |
| Angular expansion | 1.7 ′ × 1.7 ′ |
| Surface brightness | 13.3 mag / arcmin² |
| Physical data | |
| Redshift | 0.012782 +/- 0.000030 |
| Radial velocity | 3832 +/- 9 km / s |
|
Stroke distance v rad / H 0 |
(172 ± 12) · 10 6 ly (52.7 ± 3.7) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | January 10, 1785 |
| Catalog names | |
| NGC 731/757 • PGC 7118 • MCG -02-05-073 • 2MASX J01545624-0900391 • GC 440 • H III 266 • GALEX ASC J015456.08-090037.6 | |
NGC 731 = NGC 757 is an elliptical galaxy of the Hubble type E0 in the constellation Whale south of the celestial equator . It is estimated to be 172 million light years away from the Milky Way and has a diameter of about 85,000 ly.
In the same area of the sky are the galaxies NGC 713 , NGC 747 , NGC 755 , NGC 763 , among others .
The object was discovered on January 10, 1785 by the German-British astronomer Wilhelm Herschel (as NGC 731) and in 1886 by the American astronomer Ormond Stone (as NGC 757).
Web links
- Auke Slotegraaf: NGC 731. Deep Sky Observer's Companion, accessed November 7, 2015 .
- SIMBAD Astronomical Database