NGC 4861
| Galaxy NGC 4861 |
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|---|---|
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| Image of NGC 4861 from the Hubble Space Telescope | |
| AladinLite | |
| Constellation | Hunting dogs |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 12 h 59 m 02.3 s |
| declination | + 34 ° 51 ′ 34 ″ |
| Appearance | |
| Morphological type | SB (s) m: / HII / Sbrst |
| Brightness (visual) | 13.5 likes |
| Brightness (B-band) | 14.1 mag |
| Angular expansion | 4 ′, 2 × 1 ′, 6 |
| Position angle | 15 ° |
| Surface brightness | 15.4 mag / arcmin² |
| Physical data | |
| Redshift | 0.002785 ± 0.000003 |
| Radial velocity | (835 ± 1) km / s |
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Stroke distance v rad / H 0 |
(39 ± 3) x 10 6 ly (11.9 ± 0.8) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | May 1, 1785 |
| Catalog names | |
| NGC 4861 • IC 3961 • UGC 8098 • PGC 44536 • CGCG 189-005 • MCG + 06-29-03 • KUG 1256 + 351 • Arp 266A • VV 797a • GC 3340 • H IV 30 • h 1499 • I Zw 49 | |
NGC 4861 = IC 3961 = Arp 266 is a barred spiral galaxy of the Hubble type SB (s) m: in the constellation Hunting Dogs in the northern sky , which is about 39 million light years away from the Milky Way . Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class of galaxies with irregular clusters .
Many of the physical properties (such as mass, size and rotational speed) of the galaxy NGC 4861 speak for a classification as a spiral galaxy . In appearance, however, it is more like an irregular dwarf galaxy .
The object was discovered on May 1, 1785 by the German-British astronomer Friedrich Wilhelm Herschel . On March 21, 1903, Max Wolf rediscovered the object, which was recorded in the index catalog as IC 3961 .
Web links
- astronews.com: Picture of the day January 24, 2017
- Arp Atlas of Peculiar Galaxies
- Seligman Arp
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