NGC 3995
Galaxy NGC 3995 |
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NGC 3995 (center) & NGC 3994 (right), SDSS image | |
AladinLite | |
Constellation | Big Bear |
Position equinox : J2000.0 , epoch : J2000.0 |
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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