NGC 7172
| Galaxy NGC 7172 |
|
|---|---|
 |
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| Photo from the Hubble Space Telescope | |
| AladinLite | |
| Constellation | Southern fish |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 22 h 02 m 01.9 s |
| declination | -31 ° 52 ′ 11 ″ |
| Appearance | |
| Morphological type | Sa / Sy2 / HII |
| Brightness (visual) | 11.8 mag |
| Brightness (B-band) | 12.7 mag |
| Angular expansion | 2.4 ′ × 1.3 ′ |
| Position angle | 100 ° |
| Surface brightness | 12.9 mag / arcmin² |
| Physical data | |
| Affiliation | HCG 90 NGC 7154 group NGC 7172 group LGG 450 |
| Redshift | 0.008683 ± 0.000040 |
| Radial velocity | (2603 ± 12) km / s |
|
Stroke distance v rad / H 0 |
(118 ± 8) · 10 6 ly (36.2 ± 2.5) Mpc |
| history | |
| discovery | John Herschel |
| Discovery date | September 23, 1834 |
| Catalog names | |
| NGC 7172 • PGC 67874 • ESO 466-G038 • MCG -05-52-007 • IRAS 21591-3206 • 2MASX J22020189-3152116 • SGC 215907-3206.6 • HCG 90A • GC 4729 • h 3908 • NVSS J220201-315210 • LDCE 1496 NED007 | |
NGC 7172 is a spiral galaxy with an active nucleus of the Hubble type Sa in the constellation Southern Pisces. It is estimated to be 118 million light years from the Milky Way and about 85,000 light years across. Together with NGC 7173 , NGC 7174 and NGC 7176 it forms the Hickson Compact Group 90 .
The object was discovered on September 23, 1834 by the British astronomer John Herschel .
Web links
Commons : NGC 7172 - collection of images, videos, and audio files
- SIMBAD Astronomical Database
- Spektrum .de: amateur recordings [1]