NGC 3995
| Galaxy NGC 3995 |
|
|---|---|
|
|
| NGC 3995 (center) & NGC 3994 (right), SDSS image | |
| AladinLite | |
| Constellation | Big Bear |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 11 h 57 m 44.1 s |
| declination | + 32 ° 17 ′ 39 ″ |
| Appearance | |
| Morphological type | SAm / HII |
| Brightness (visual) | 12.1 mag |
| Brightness (B-band) | 12.7 mag |
| Angular expansion | 2.6 ′ × 0.9 ′ |
| Position angle | 33 ° |
| Surface brightness | 12.9 mag / arcmin² |
| Physical data | |
| Affiliation | LGG 259 |
| Redshift | 0.010854 ± 0.000017 |
| Radial velocity | (3254 ± 5) km / s |
|
Stroke distance v rad / H 0 |
(145 ± 10) · 10 6 ly (44.6 ± 3.1) Mpc |
| history | |
| discovery | Heinrich d'Arrest |
| Discovery date | February 5, 1864 |
| Catalog names | |
| NGC 3995 • UGC 6944 • PGC 37624 • CGCG 186-075 • MCG + 06-26-061 • KUG 1155 + 325B • 2MASX J11574411 + 3217389 • Arp 313 • VV 249a • HOLM 309A • LDCE 852 NED007 | |
NGC 3995 is a spiral radio galaxy with extensive star formation regions of the Hubble type SBm in the constellation Great Bear in the northern sky . It is estimated to be 145 million light years from the Milky Way and about 55,000 light years in diameter. Together with NGC 3991 and NGC 3994 , it forms the galaxy trio Arp 313 or Holm 309 .
Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy triplet belongs to the class of galaxy groups .
In the same area of the sky are u. a. the galaxies NGC 3966 , IC 2978 , IC 2979 , IC 2981 .
The supernovae SN 1988ac (type Ib / c?) And SN 2000ez (type II) were observed here.
The object was discovered on February 5, 1864 by Heinrich d'Arrest .
literature
- Jeff Kanipe and Dennis Webb: The Arp Atlas of Peculiar Galaxies - A Chronicle and Observer's Guide , Richmond 2006, ISBN 978-0-943396-76-7
