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
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 within close proximity to 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.

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]

Supernovae

Two supernovae have been observed in NGC 945. 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] SN 2020obd (type II, mag. 17.3) was discovered on 6 July 2020. [8]

NGC 945 group

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

Related Research Articles

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<span class="mw-page-title-main">NGC 1032</span> Spiral galaxy in the constellation Cetus

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<span class="mw-page-title-main">NGC 157</span> Galaxy in the constellation Cetus

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<span class="mw-page-title-main">NGC 298</span> Spiral galaxy located in the constellation Cetus

NGC 298 is a spiral galaxy in the constellation Cetus. It was discovered on September 27, 1864, by Albert Marth. NGC 298 is situated close to the celestial equator and, as such, it is at least partly visible from both hemispheres in certain times of the year. Given its B magnitude of 14.7, NGC 298 is visible with the help of a telescope having an aperture of 20 inches or more.

<span class="mw-page-title-main">NGC 991</span> Intermediate spiral galaxy in the constellation Cetus

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<span class="mw-page-title-main">NGC 941</span> Spiral galaxy in the constellation Cetus

NGC 941 is an intermediate spiral galaxy in the constellation Cetus. It is an estimated 16.83 MPc from the Milky Way and has a diameter of approximately 55,000 light years. The galaxies NGC 926, NGC 934, NGC 936, NGC 955 are located in the same sky area. NGC 941 was discovered by the astronomer William Herschel on 6 January 1785.

<span class="mw-page-title-main">NGC 606</span> Galaxy in the constellation Pisces

NGC 606 is a barred spiral galaxy located in the Pisces constellation about 470 million light-years from the Milky Way. It was discovered by the French astronomer Édouard Stephan in 1881.

<span class="mw-page-title-main">NGC 1325</span> Galaxy in the constellation Eridanus

NGC 1325 is a flocculent spiral galaxy situated in the constellation of Eridanus. Located about 75 million light years away, it is a member of the Eridanus cluster of galaxies, a cluster of about 200 galaxies. It was discovered by William Herschel on 19 December 1799.

<span class="mw-page-title-main">NGC 7329</span> Galaxy in the constellation Tucana

NGC 7329 is a large barred spiral galaxy located in the constellation Tucana. NGC 7329 was discovered by British astronomer John Herschel in 1835.

<span class="mw-page-title-main">NGC 5777</span> Galaxy in the constellation Draco

NGC 5777 is a large edge-on spiral galaxy located in the constellation Draco. Its speed relative to the cosmic microwave background is 2,210 ± 5 km/s, which corresponds to a Hubble distance of 32.6 ± 2.3 Mpc. NGC 5777 was discovered by German-British astronomer William Herschel in 1789.

<span class="mw-page-title-main">NGC 7828</span> Galaxy in the constellation Cetus

NGC 7828 is a peculiar galaxy in the constellation Cetus. The galaxy lies about 300 million light years away from Earth, which means, given its apparent dimensions, that NGC 7828 is approximately 75,000 light years across. It was discovered by American astronomer Francis Leavenworth in 1886. NGC 7828 forms a pair with its neighbor NGC 7829. The galaxy is included in Halton Arp's Atlas of Peculiar Galaxies in the elliptical galaxies emanating material category as Arp 144.

<span class="mw-page-title-main">NGC 5683</span> Galaxy in the constellation Boötes

NGC 5683 is a type S0-a lenticular galaxy with a bar located in the Boötes constellation. It is 513 million light-years away from the Solar System and has an approximate diameter of 256,000 light-years meaning it is larger compared to the Milky Way. NGC 5683 was discovered by George Johnstone Stoney on April 13, 1850.

<span class="mw-page-title-main">NGC 7222</span> Large barred spiral galaxy in the constellation Aquarius

NGC 7222 is a large barred spiral galaxy with a ring structure, located in the constellation Aquarius. It is located 570 million light-years away from the Solar System and was discovered by German astronomer, Albert Marth on August 11, 1864.

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

NGC 2935 is a large intermediate spiral galaxy located in the constellation Hydra. Its speed relative to the cosmic microwave background is 2,601 ± 23 km/s, which corresponds to a Hubble distance of 38.4 ± 2.7 Mpc. NGC 2935 was discovered by German-British astronomer William Herschel in 1786.

<span class="mw-page-title-main">NGC 4017</span> Spiral radio galaxy in the constellation Coma Berenices

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.

<span class="mw-page-title-main">NGC 958</span> Galaxy in the constellation Cetus

NGC 958 is a barred spiral galaxy in the constellation of Cetus. Its velocity with respect to the cosmic microwave background is 5505 ± 17 km/s, which corresponds to a Hubble distance of 81.20 ± 5.69 Mpc. However, 19 non-redshift measurements give a distance of 58.93 ± 12.91 Mpc. The galaxy was discovered by German-British astronomer William Herschel on 20 September 1784.

<span class="mw-page-title-main">NGC 2927</span> Galaxy in the constellation Leo

NGC 2927 is a barred spiral galaxy in the constellation of Leo. Its velocity with respect to the cosmic microwave background is 7830 ± 20 km/s, which corresponds to a Hubble distance of 115.49 ± 8.09 Mpc. In addition, three non-redshift measurements give a distance of 120.667 ± 0.882. The galaxy was discovered by German astronomer Heinrich d'Arrest on 21 February 1863.

<span class="mw-page-title-main">NGC 3052</span> Galaxy in the constellation Hydra

NGC 3052 is a intermediate spiral galaxy in the constellation of Hydra. Its velocity with respect to the cosmic microwave background is 4122 ± 24 km/s, which corresponds to a Hubble distance of 60.79 ± 4.27 Mpc. However, 19 non redshift measurements give a distance of 42.563 ± 6.434 Mpc. The galaxy was discovered by German-British astronomer William Herschel on 7 February 1785.

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. ↑ "SN 2020obd". Transient Name Server. IAU . Retrieved 5 September 2024.
  9. 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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