NGC 4651
Galaxy NGC 4651 |
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NGC 4651, the Umbrella Galaxy | |
AladinLite | |
Constellation | Berenike's hair |
Position equinox : J2000.0 , epoch : J2000.0 |
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Right ascension | 12 h 43 m 42.6 s |
declination | + 16 ° 23 ′ 36 ″ |
Appearance | |
Morphological type | SA (rs) c LINER |
Brightness (visual) | 10.6 mag |
Brightness (B-band) | 11.3 mag |
Angular expansion | 4 ′ × 2.7 ′ |
Position angle | 80 ° |
Surface brightness | 13.0 mag / arcmin² |
Physical data | |
Affiliation | LGG 289 |
Redshift | 0.002625 ± 0.000007 |
Radial velocity | (+798 ± 2) km / s |
Stroke distance v rad / H 0 |
(34 ± 2) x 10 6 ly (10.3 ± 0.7) Mpc |
history | |
discovery | William Herschel |
Discovery date | December 30, 1783 |
Catalog names | |
NGC 4651 • UGC 7901 • PGC 42833 • CGCG 100-004 • MCG + 03-33-001 • IRAS 12412 + 1639 • 2MASX J12434262 + 1623362 • Arp 189 • VV 56 • GC 3184 • H II 12 • h 1409 • Kara 549 |
NGC 4651 = Arp 189 , also called Umbrella Galaxy , is a spiral galaxy of the Hubble type SA (rs) c pec in the constellation Haar der Berenike in the northern sky . It is about 34 million light years from the Milky Way . It has a filament-like structure of ancient stars that extends eastward for more than 50,000 light-years like a jet and ends in an umbrella-like appendage. Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class of narrow filament galaxies .
Apparently, six to ten billion years ago, a dwarf galaxy got into the gravitational field and was slowly pulled apart by the tidal forces along its orbit around its bigger sister. This leads to a loose group of stars winding around the parent galaxy as a stellar current , moving particularly slowly at the apex and having the highest star density there.
The object was discovered on December 30, 1783 by the German-British astronomer Friedrich Wilhelm Herschel .
Web links
literature
- Jeff Kanipe, Dennis Webb: The Arp Atlas of Peculiar Galaxies - A Chronicle and Observer's Guide. Richmond 2006, ISBN 978-0-943396-76-7 .
Individual evidence
- ↑ a b c d e NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ a b c d e SEDS : NGC 4651
- ↑ Nadja Podbregar: Milky Way twin is a cannibal. Astronomers detect the remains of intertwined dwarf galaxies in the umbrella galaxy. In: scinexx . MMCD NEW MEDIA, July 2, 2014, accessed July 25, 2014 .
- ↑ Stars and Space . December 2011, p. 12f.
- ↑ Seligman