NGC 4691
| Galaxy NGC 4691 |
|
|---|---|
|
|
| Image of the galaxy NGC 4691 with the help of the 81 cm reflecting telescope of the Mount Lemmon Observatory | |
| AladinLite | |
| Constellation | Virgin |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 12 h 48 m 13.6 s |
| declination | -03 ° 19 ′ 58 ″ |
| Appearance | |
| Morphological type | SB0-a / AGN / HII |
| Brightness (visual) | 11.1 mag |
| Brightness (B-band) | 11.7 mag |
| Angular expansion | 2.7 ′ × 2.5 ′ |
| Position angle | 85 ° |
| Surface brightness | 13.0 mag / arcmin² |
| Physical data | |
| Affiliation | NGC 4691 group |
| Redshift | 0.003703 +/- 0.000023 |
| Radial velocity | 1110 +/- 7 km / s |
|
Stroke distance v rad / H 0 |
(45 ± 3) x 10 6 ly (13.9 ± 1.0) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | April 17, 1784 |
| Catalog names | |
| NGC 4691 • UGCA 299 • PGC 43238 • MCG + 00-33-013 • IRAS 12456-0303 • GC 3221 • H II 182 • h 1432 • LEDA 43238 • LDCE 904 NED249 | |
NGC 4691 is an active Lenticular galaxy with extensive star formation from Hubble type SB0-a in the constellation Virgo north of the ecliptic . It is estimated to be 45 million light years from the Milky Way and about 40,000 light years in diameter .
The galaxies NGC 4684 and NGC 4720 are located in the same area of the sky .
The Type Ib supernova SN 1997X was observed here.
The object was discovered on April 17, 1784 by Wilhelm Herschel with an 18.7-inch reflector telescope, who described it as “pF, pL, E, r”.