NGC 5996
| Galaxy NGC 5996 |
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|---|---|
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| NGC 5996 & NGC 5994, SDSS image | |
| AladinLite | |
| Constellation | Snake |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 15 h 46 m 58.9 s |
| declination | + 17 ° 53 ′ 03 ″ |
| Appearance | |
| Morphological type | SBc / HII / Sbrst |
| Brightness (visual) | 12.5 mag |
| Brightness (B-band) | 13.2 mag |
| Angular expansion | 1.7 ′ × 0.9 ′ |
| Position angle | 33 ° |
| Surface brightness | 12.8 mag / arcmin² |
| Physical data | |
| Redshift | 0.010998 ± 0.000007 |
| Radial velocity | 3297 ± 2 km / s |
|
Stroke distance v rad / H 0 |
(151 ± 10) · 10 6 ly (46.3 ± 3.2) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | March 21, 1784 |
| Catalog names | |
| NGC 5996 • UGC 10033 • PGC 56023 • CGCG 107-036 NED02 • MCG + 03-40-039 • IRAS 15447 + 1802 • 2MASX J15465887 + 1753031 • Arp 72 • Mrk 691 • VV 16 • GC 4139 • H II 97 • h 1938 • HOLM 721A | |
NGC 5996 is a 12.5 mag bright spiral galaxy with a high rate of star formation of the Hubble type Sc in the constellation Snake north of the ecliptic . It is estimated to be 151 million light years away from the Milky Way and has a diameter of around 75,000 ly. The galaxy is in gravitational interaction with NGC 5994 , with which it forms the constellation Arp 72 . 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 small companion of high surface brightness on one arm (Arp catalog) .
The galaxies IC 1135 and IC 1142 are located in the same area of the sky .
The Type Ia supernova candidate ASASSN -15db was observed here.
The object was discovered on March 21, 1784 by Wilhelm Herschel with an 18.7-inch reflector telescope, who described it as “pF, S, r, preceding two pretty bright stars”.
Web links
- NGC 5996. SIMBAD, accessed May 22, 2016 .
- NGC 5996. DSO Browser, accessed May 22, 2016 .
- ARP ATLAS OF PECULIAR GALAXIES
- Seligman Arp