NGC 1232
| Galaxy NGC 1232 |
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|---|---|
|
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| Photo of the Very Large Telescope , NGC 1232 and PGC 11834 (left) | |
| AladinLite | |
| Constellation | Eridanus |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 03 h 09 m 45.51 s |
| declination | -20 ° 34 ′ 45.5 ″ |
| Appearance | |
| Morphological type | SAB (rs) c |
| Brightness (visual) | 9.8 likes |
| Brightness (B-band) | 10.5 mag |
| Angular expansion | 7.4 ′ × 6.5 ′ |
| Position angle | 108 ° |
| Surface brightness | 13.9 mag / arcmin² |
| Physical data | |
| Affiliation |
Eridanus group SSRS group 78 |
| Redshift | 0.005347 ± 0.000003 |
| Radial velocity | 1603 ± 1 km / s |
|
Stroke distance v rad / H 0 |
(68 ± 5) · 10 6 ly (21 ± 1.5) Mpc |
| diameter | 200,000 ly |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | October 20, 1784 |
| Catalog names | |
| NGC 1232 • PGC 11819 • ESO 547-014 • MCG -04-08-032 • IRAS 03074-2045 • 2MASX J03094551-2034454 • SGC 030730-2046.1 • Arp 41 • GC 651 • H II 258 • h 2509 • HIPASS J0309- 20 • LDCE 251 NED002 | |
NGC 1232 is a bar-spiral galaxy of the Hubble type SBc in the constellation Eridanus in the southern sky . It has a brightness of 9.8 mag and an angular extent of 7.4 × 6.5 '. The galaxy is around 68 million light years away from the Milky Way and is around 160,000 light years across .
Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class spiral galaxies with a companion of low surface brightness on one arm (Arp catalog) . With its apparent companion PGC 11834 (unofficially called NGC 1232A ), NGC 1232 forms the object Arp 41 .
Detailed observations suggest the presence of significant amounts of dark matter .
The object was discovered on October 20, 1784 by the German-British astronomer Wilhelm Herschel .
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
- NGC 1232 at GoBlack
- Antilhue - Chile
- ESO
- Great Spiral Galaxy NGC 1232 - Astronomy Picture of the Day of August 24, 2008.
- Arp Atlas of Peculiar Galaxies
- Seligman Arp
- Aladin Lite