NGC 4490
| Galaxy NGC 4490 |
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|---|---|
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| Photo from the Hubble Space Telescope | |
| AladinLite | |
| Constellation | Hunting dogs |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 12 h 30 m 36.239 s |
| declination | + 41 ° 38 ′ 38.03 ″ |
| Appearance | |
| Morphological type | SB (s) d / pec / HII |
| Brightness (visual) | 9.5 likes |
| Brightness (B-band) | 10.2 mag |
| Angular expansion | 6.4 ′ × 3.2 ′ |
| Position angle | 125 ° |
| Surface brightness | 12.6 mag / arcmin² |
| Physical data | |
| Affiliation | Messier 106 group NGC 4258 group LGG 290 |
| Redshift | 0.001885 ± 0.000010 |
| Radial velocity | (565 ± 3) km / s |
|
Stroke distance v rad / H 0 |
(27 ± 2) x 10 6 ly (8.36 ± 0.59) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | January 14, 1788 |
| Catalog names | |
| NGC 4490 • UGC 7651 • PGC 41333 • CGCG 216-008 • MCG + 07-26-14 • IRAS 12281 + 4155 • KUG 1228 + 419 • 2MASX J12303636 + 4138370 • Arp 269 • VV 30a • GC 3042 • H I 198 • h 1308 • NSA 141527 • KPG 341B • Holm 414A, • LDCE 867 NED117 | |
NGC 4490 is a barred spiral galaxy of the Hubble type SBcd with extensive star formation areas in the constellation Hounds in the northern sky . It is estimated to be 27 million light years from the Milky Way and about 50,000 light years across. Together with NGC 4485 , it forms the interacting galaxy pair Arp 269 or Holm 414 , which is connected by a so-called tidal arm that protrudes around 24,000 light years into space. She is also considered a member of the NGC 4258 group ( LGG 290 ).
Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This pair of galaxies belongs to the class double galaxies with linked arms .
The supernovae SN 1982F (Type II-P) and SN 2008ax (Type IIb) were observed here.
The object was discovered on January 14, 1788 by the German-British astronomer Wilhelm Herschel .
The galaxies NGC 4490 (left) and NGC 4485 (right) recorded with the 81 cm reflecting telescope of the Mount Lemmon Observatory
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
Web links
- SIMBAD Astronomical Database
- Interacting Galaxies NGC4485 / 90
- Chandra
- Arp Atlas of Peculiar Galaxies
- Seligman Arp
- Photos of galaxies Stargazer Observatory, see section on NGC 4490 + NGC 4485 (high-resolution image from an amateur observatory with semi-professional optics)
- Spektrum.de : Amateur recordings [1] [2] [3]
- Aladin Lite