NGC 945
| NGC 945 | |
|---|---|
 NGC 945 (right) and NGC 948 (left) | |
| Observation data (J2000epoch) | |
| Right ascension | 02h 28m 36s |
| Declination | -10° 32′20″ |
| Apparent magnitude(B) | 1202h 28m 36s |
| Surface brightness | 23.01 mag/arcsec2 |
| Other designations | |
| IRAS02261-1045,2MASXJ02283732-1032211,MCG-02-07-013,PGC009426 | |
NGC 945is abarred spiral galaxyin the constellationCetus,[1]located south of thecelestial equator.It is estimated to be 200 million light-years from theMilky Way,and about 135,000 light-years in diameter.[2]The object was discovered byastronomerWilliam Herschelon November 28, 1785. It is within close proximity to NGC 948, with which it forms agravitationally bound pair of galaxies.In the same area of the sky there are the galaxiesNGC 942,NGC 943,NGC 950,andIC 230.
NGC 948
[edit]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 astronomerLewis Swiftin 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 alow surface brightness galaxy(LSB).[5]
Supernovae
[edit]Twosupernovaehave been observed in NGC 945.SN1998dtwas discovered in NGC 945 on September 1, 1998, by T. Shefler of the University of California at Berkeley[6]as part of theLOSS(Lick Observatory Supernova Search) program at theLick observatory.This supernova is classified as atype Ib.[7]SN2020obd(typeII,mag. 17.3) was discovered on 6 July 2020.[8]
NGC 945 group
[edit]NGC 945 is the brightest galaxy in a group of at least 7 members that bears its name.[9]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.[9]
See also
[edit]References
[edit]- ^"NGC 945 - Galaxy in Cetus | TheSkyLive".theskylive.Retrieved2024-04-16.
- ^Ford, Dominic."NGC945 (Galaxy)".In-The-Sky.org.Retrieved2024-04-16.
- ^"NGC 948 - Spiral Galaxy in Cetus | TheSkyLive".theskylive.Retrieved2024-04-16.
- ^"NGC/IC Project Restoration Efforts".ngcicproject.observers.org.Retrieved2024-04-16.
- ^"Astrovalleyfield".astrovalleyfield.ca.Retrieved2024-05-03.
- ^Srivastav, S.; Smith, K. W.; McBrien, O.; Smartt, S. J.; Gillanders, J.; Clark, P.; Fulton, M.; O'Neill, D.; Young, D. R.; McCollum, M.; Townsend, A.; Chen, T. W.; Anderson, J.; Denneau, L.; Flewelling, H. (2020-07-01)."ATLAS20say (AT2020obd): discovery of a candidate supernova in NGC 945 (56 Mpc)".Transient Name Server AstroNote.133:1.Bibcode:2020TNSAN.133....1S.
- ^Shefler, T.; Halderson, E.; Modjaz, M.; King, J. Y.; Li, W. D.; Treffers, R. R.; Filippenko, A. V. (1998-09-01)."Supernova 1998dt in NGC 945".International Astronomical Union Circular(7006): 3.Bibcode:1998IAUC.7006....3S.ISSN0081-0304.
- ^"SN2020obd ".Transient Name Server.IAU.Retrieved5 September2024.
- ^abGarcia, A. M. (1993-07-01)."General study of group membership. II. Determination of nearby groups".Astronomy and Astrophysics Supplement Series.100:47–90.Bibcode:1993A&AS..100...47G.ISSN0365-0138.
