NGC 945

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NGC 945
NGC 945 NGC 948 legacy dr10.jpg
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

NGC 945 is a barred spiral galaxy in the constellation Cetus. [1] It is 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] Together with NGC 948, it forms a gravitationally bound pair of galaxies. In the same area of the sky there are, among other things: the galaxies NGC 942, NGC 943, NGC 950, IC 230. The Type Ib supernova SN 1998dt was observed here. The object was discovered by astronomer William Herschel on November 28, 1785. It is within close proximity to NGC 948.

Contents

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]

Supernova

The supernova SN 1998dt was discovered in NGC 945 on September 1, 1998, by T. Shefler of the University of California at Berkeley [6] as part of the LOSS (Lick Observatory Supernova Search) program at the Lick observatory. This supernova is classified as a type Ib. [7]

NGC 945 group

NGC 945 is the brightest galaxy in a group of at least 7 members that bears its name. [8] 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. [8]

See also

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<span class="mw-page-title-main">NGC 747</span> Galaxy in the constellation Cetus

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<span class="mw-page-title-main">NGC 2935</span> Large galaxy in constellation Hydra

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NGC 4017 is an intermediate spiral radio galaxy located in the constellation Coma Berenices. Its speed relative to the cosmic microwave background is 3,748 ± 21 km/s, which corresponds to a Hubble distance of 55.3 ± 3.9 Mpc. NGC 4017 was discovered by German-British astronomer William Herschel in 1785.

<span class="mw-page-title-main">NGC 5504</span> Spiral galaxy in the constellation Boötes

NGC 5504 is an intermediate barred spiral galaxy located in the constellation Boötes. Its speed relative to the cosmic microwave background is 5,482 ± 17 km/s, which corresponds to a Hubble distance of 80.9 ± 5.7 Mpc. NGC 5504 was discovered by French astronomer Édouard Stephan in 1880.

References

  1. ↑ "NGC 945 - Galaxy in Cetus | TheSkyLive.com". theskylive.com. Retrieved 2024-04-16.
  2. ↑ Ford, Dominic. "NGC945 (Galaxy)". In-The-Sky.org. Retrieved 2024-04-16.
  3. ↑ "NGC 948 - Spiral Galaxy in Cetus | TheSkyLive.com". theskylive.com. Retrieved 2024-04-16.
  4. ↑ "NGC/IC Project Restoration Efforts". ngcicproject.observers.org. Retrieved 2024-04-16.
  5. ↑ "Astrovalleyfield". astrovalleyfield.ca. Retrieved 2024-05-03.
  6. ↑ 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.
  7. ↑ 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. ISSN   0081-0304.
  8. 1 2 Garcia, 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. ISSN   0365-0138.
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