NGC 4684
| Galaxy NGC 4684 |
|
|---|---|
|
|
| SDSS | |
| AladinLite | |
| Constellation | Virgin |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 12 h 47 m 17.5 s |
| declination | -02 ° 43 ′ 39 ″ |
| Appearance | |
| Morphological type | SB (r) 0+ / HII |
| Brightness (visual) | 11.5 likes |
| Brightness (B-band) | 12.4 mag |
| Angular expansion | 2.8 ′ × 1.1 ′ |
| Position angle | 23 ° |
| Surface brightness | 12.6 mag / arcmin² |
| Physical data | |
| Redshift | 0.005204 ± 0.000017 |
| Radial velocity | 1560 ± 5 km / s |
|
Stroke distance v rad / H 0 |
(66 ± 5) x 10 6 ly (20.1 ± 1.4) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | April 17, 1784 |
| Catalog names | |
| NGC 4684 • UGC 7951 • PGC 43149 • MCG + 00-33-011 • IRAS 12447-0227 • GC 3214 • H II 181 • h 1426 • LDCE 904 NED247 | |
NGC 4684 is an 11.5 mag bright, lens-shaped galaxy of the Hubble-type SB0 / a in the constellation Virgo on the ecliptic . It is an estimated 66 million light years away from the Milky Way and about 60,000 light years in diameter.
In the same area of the sky is u. a. the galaxy NGC 4691 .
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”.