NGC 4990
| Galaxy NGC 4990 |
|
|---|---|
|
|
| High-resolution image of the spiral galaxy NGC 4990 taken with the Hubble Space Telescope | |
| AladinLite | |
| Constellation | Virgin |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 13 h 09 m 17.3 s |
| declination | -05 ° 16 ′ 22 ″ |
| Appearance | |
| Morphological type | S0 / HII |
| Brightness (visual) | 13.9 likes |
| Brightness (B-band) | 14.9 mag |
| Angular expansion | 1.0 ′ × 0.8 ′ |
| Position angle | 55 ° |
| Surface brightness | 13.5 mag / arcmin² |
| Physical data | |
| Redshift | 0.010574 +/- 0.000023 |
| Radial velocity | 3170 +/- 7 km / s |
|
Stroke distance v rad / H 0 |
(138 ± 10) · 10 6 ly (42.3 ± 3.0) Mpc |
| history | |
| discovery | Heinrich d'Arrest |
| Discovery date | March 23, 1865 |
| Catalog names | |
| NGC 4990 • PGC 45608 • MCG -01-34-004 • IRAS 13067-0500 • 2MASX J13091728-0516219 • Mrk 1344 • GC 5718 • LDCE 0947 NED002 • LEDA 45608 | |
NGC 4990 , also known as the Cocoon Galaxy , is a 13.9 mag bright lens-shaped galaxy with an active nucleus of the Hubble type S0 in the constellation Virgo north of the ecliptic . It has extensive HII regions with a high rate of star formation . The galaxy is estimated to be 138 million light years away from the Milky Way and has a diameter of around 40,000 ly.
In the same area of the sky are the galaxies NGC 4975 , NGC 4989 , IC 855 , among others .
The object was discovered on March 23, 1865 by Heinrich Louis d'Arrest .
Web links
- NGC 4990. SIMBAD, accessed February 23, 2015 .
- NGC 4990. DSO Browser, accessed February 23, 2015 .
- Auke Slotegraaf: NGC 4990. Deep Sky Observer's Companion, accessed on February 23, 2015 .