Astronomy:NGC 945

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NGC 945
NGC 945 (right) and NGC 948 (left)
Observation data (J2000 epoch)
Right ascension02h 28m 36s
Declination-10° 32′ 20″
Apparent magnitude (B)1202h 28m 36s
Other designations
IRAS 02261-1045, 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

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

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

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

References

  1. ↑ "NGC 945 - Galaxy in Cetus | TheSkyLive.com". https://theskylive.com/sky/deepsky/ngc945-object. 
  2. ↑ Ford, Dominic. "NGC945 (Galaxy)" (in en). https://in-the-sky.org//data/object.php?id=NGC945. 
  3. ↑ "NGC 948 - Spiral Galaxy in Cetus | TheSkyLive.com". https://theskylive.com/sky/deepsky/ngc948-object. 
  4. ↑ "NGC/IC Project Restoration Efforts". https://ngcicproject.observers.org/NGC/NGC_09xx/NGC_0948.htm. 
  5. ↑ "Astrovalleyfield". http://astrovalleyfield.ca/AstronomieCompl/NGC%20et%20autres/WolfgangS/N0900_exc_web.htm. 
  6. ↑ 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. ISSN 0081-0304. Bibcode: 1998IAUC.7006....3S. https://ui.adsabs.harvard.edu/abs/1998IAUC.7006....3S. 
  7. ↑ "SN 1998dt". IAU. https://www.wis-tns.org/object/1998dt. 
  8. ↑ "SN 2020obd". IAU. https://www.wis-tns.org/object/2020obd. 
  9. ↑ Srivastav, S.; Smith, K. W.; McBrien, O.; Smartt, S. J.; Gillanders, J.; Clark, P.; Fulton, M.; O'Neill, D. et al. (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. https://ui.adsabs.harvard.edu/abs/2020TNSAN.133....1S. 
  10. ↑ 10.0 10.1 Garcia, A. M. (1993-07-01). "General study of group membership. II. Determination of nearby groups.". Astronomy and Astrophysics Supplement Series 100: 47–90. ISSN 0365-0138. Bibcode: 1993A&AS..100...47G. https://ui.adsabs.harvard.edu/abs/1993A&AS..100...47G. 



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