NGC 945
| NGC 945 | |
|---|---|
 NGC 945 (right) and NGC 948 (left) | |
| Observation data (J2000 epoch) | |
| Right ascension | 02h 28m 36s |
| Declination | -10° 32′ 20″ |
| Apparent magnitude (B) | 1202h 28m 36s |
| Surface brightness | 23.01 mag/arcsec2 |
| Other designations | |
| IRAS 02261-1045, 2MASX J02283732-1032211, MCG -02-07-013, PGC 009426 | |
NGC 945 is a barred spiral galaxy in the constellation Cetus,[1] located south of the celestial equator. It is estimated to be 200 million light-years from the Milky Way, and about 135,000 light-years in diameter.[2] The object was discovered by astronomer William Herschel on November 28, 1785. It is near NGC 948, with which it forms a gravitationally bound pair of galaxies. In the same area of the sky there are the galaxies NGC 942, NGC 943, NGC 950, and IC 230.
NGC 948
[edit | edit source]NGC 948 is a spiral galaxy located extremely close to NGC 945.[3] Its speed relative to the cosmic microwave background is 4,259 ± 17 km/s,[4] which corresponds to a Hubble distance of 62.8 ± 4.4 Mpc (~205 million ly). NGC 948 was discovered by American astronomer Lewis Swift in 1886. The luminosity class of NGC 948 is III and it has a broad HI line. With a surface brightness equal to 14.17 mag/am2, NGC 948 is classified as a low surface brightness galaxy (LSB).[5]
Supernovae
[edit | edit source]Two supernovae have been observed in NGC 945:
- SN 1998dt (type Ib, mag. 17.7) was discovered by T. Shefler of the University of California at Berkeley on 1 September 1998, as part of the LOSS (Lick Observatory Supernova Search) program at the Lick observatory.[6][7]
- SN 2020obd (type II, mag. 17.3) was discovered by ATLAS on 6 July 2020.[8][9]
NGC 945 group
[edit | edit source]NGC 945 is the brightest galaxy in a group of at least 7 members that bears its name.[10] The other six galaxies in the NGC 945 group are NGC 948, NGC 950, NGC 977, MCG -2-7-20, MCG -2-7-32 and MCG -2-7-337.[10]
See also
[edit | edit source]References
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