NGC 991
| Galaxy NGC 991 |
|
|---|---|
|
|
| SDSS recording | |
| AladinLite | |
| Constellation | whale |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 02 h 35 m 32.7 s |
| declination | -07 ° 09 ′ 16 ″ |
| Appearance | |
| Morphological type | SAB (rs) c |
| Brightness (visual) | 11.7 mag |
| Brightness (B-band) | 12.4 mag |
| Angular expansion | 3 ′ × 2.7 ′ |
| Position angle | 60 ° |
| Surface brightness | 13.8 mag / arcmin² |
| Physical data | |
| Affiliation | LGG 71 |
| Redshift | 0.005110 ± 0.000003 |
| Radial velocity | 1532 ± 1 km / s |
|
Stroke distance v rad / H 0 |
(68 ± 5) x 10 6 ly (20.9 ± 1.5) Mpc |
| history | |
| discovery | William Herschel |
| Discovery date | September 10, 1785 |
| Catalog names | |
| NGC 991 • PGC 9846 • MCG -01-07-023 • IRAS 02330-0722 • KUG 0233-073 • 2MASX J02353199-0709366 • GC 570 • H III 434 • h 239 • HIPASS J0235-07 • LDCE 182 NED002 | |
NGC 991 is a barred spiral galaxy of the Hubble type SBc in the constellation Whale south of the ecliptic . It is estimated to be 68 million light-years away from the Milky Way and has a diameter of about 60,000 ly.
In the same area of the sky there are u. a. the galaxies NGC 1022 and IC 243 .
The Type Ib supernova SN 1984L was observed here.
The galaxy was on 10 September 1785 by the astronomer William Herschel using a 18.7-inch - telescope discovered.
Web links
Commons : NGC 991 - collection of images, videos, and audio files
