NGC 2993
| Galaxy NGC 2993 |
|
|---|---|
|
|
| Image taken with an 80 cm telescope | |
| AladinLite | |
| Constellation | Water snake |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 09 h 45 m 48.3 s |
| declination | -14 ° 22 ′ 06 ″ |
| Appearance | |
| Morphological type | Sa / pec / HII |
| Brightness (visual) | 12.6 mag |
| Brightness (B-band) | 13.5 likes |
| Angular expansion | 1.3 ′ × 0.9 ′ |
| Position angle | 95 ° |
| Surface brightness | 12.6 mag / arcmin² |
| Physical data | |
| Redshift | 0.008106 ± 0.000022 |
| Radial velocity | (2430 ± 7) km / s |
|
Stroke distance v rad / H 0 |
(100 ± 7) x 10 6 ly (30.7 ± 2.2) Mpc |
| history | |
| discovery | William Herschel |
| Discovery date | February 8, 1785 |
| Catalog names | |
| NGC 2993 • PGC 27991 • MCG -02-25-015 • IRAS 09434-1408 • 2MASX J09454832-1422060 • Arp 245 • GC 1919 • H III 278 • h 637 • | |
NGC 2993 is a Hubble-type Sa spiral galaxy in the constellation Water Snake south of the celestial equator , an estimated 100 million light years 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 galaxies showing signs of splitting .
The object was discovered on February 8, 1785 by the German-British astronomer William Herschel .
Web links
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