NGC 172
| Galaxy NGC 172 |
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|---|---|
![NGC 172 & LEDA 812139 (r) [1] SDSS image](https://de.wikipedia.org/wiki/Datei:NGC172_-_SDSS_DR14.jpg)
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| NGC 172 & LEDA 812139 (r) SDSS image | |
| AladinLite | |
| Constellation | whale |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 00 h 37 m 13.61 s |
| declination | -22 ° 35 ′ 13.3 ″ |
| Appearance | |
| Morphological type | SB (r) bc? / sp / HII |
| Brightness (visual) | 13.6 mag |
| Brightness (B-band) | 14.4 mag |
| Angular expansion | 2 ′, 0 × 0 ′, 3 |
| Position angle | 12 ° |
| Surface brightness | 12.9 mag / arcmin² |
| Physical data | |
| Redshift | 0.010164 ± 0.000010 |
| Radial velocity | 3047 ± 3 km / s |
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Stroke distance v rad / H 0 |
(137 ± 9) x 10 6 ly (42.0 ± 2.9) Mpc |
| history | |
| discovery | Frank Muller |
| Discovery date | 1886 |
| Catalog names | |
| NGC 172 • PGC 2228 • ESO 474-005 • MCG -04-02-027 • IRAS 00348-2251 • 2MASX J00371359-2235132 • SGC 003445-2251.6 • HIPASS J0037-22 • KTS 4B • NVSS J003712-223525 • WISEA J003713. 62-223512.7 | |
NGC 172 is a barred spiral galaxy of the Hubble-type SBbc with extensive star formation areas in the constellation Whale south of the celestial equator . It is estimated to be 137 million light years from the Milky Way and about 80,000 light years across . Together with NGC 168 and NGC 177 it forms the (optical?) Galaxy trio KTS 4 .
In the same area of the sky is u. a. the galaxy NGC 167 .
The object was discovered in 1886 by the astronomer Frank Muller .