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:

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

Related Research Articles

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NGC 7331, also known as Caldwell 30, is an unbarred spiral galaxy about 40 million light-years (12 Mpc) away in the constellation Pegasus. It was discovered by William Herschel in 1784. NGC 7331 is the brightest galaxy in the field of a visual grouping known as the NGC 7331 Group of galaxies. In fact, the other members of the group, NGC 7335, NGC 7336, NGC 7337 and NGC 7340, lie far in the background at distances of approximately 300–350 million light years.

<span class="mw-page-title-main">NGC 7479</span> Galaxy in the constellation Pegasus

NGC 7479 is a barred spiral galaxy about 105 million light-years away in the constellation Pegasus. William Herschel discovered it in 1784. NGC 7479 is also recognized as a Seyfert galaxy and a LINER undergoing starburst activity not only on the nucleus and the outer arms, but also across the bar of the galaxy, where most of the stars were formed in the last 100 million years. Polarization studies of this galaxy indicate that it recently underwent a minor merger and that it is unique in the radio continuum, with arms opening in a direction opposite to the optical arms. This feature, along with the asymmetrical arms of the galaxy and the intense star formation activity are attributed to a merger with a smaller galaxy. This galaxy is similar in both size and morphology to the barred spiral NGC 1300.

<span class="mw-page-title-main">NGC 4567 and NGC 4568</span> Interacting galaxy pair in the constellation Virgo

NGC 4567 and NGC 4568 are a set of unbarred spiral galaxies about 60 million light-years away in the constellation Virgo. They were both discovered by William Herschel in 1784. They are part of the Virgo Cluster of galaxies.

<span class="mw-page-title-main">NGC 7714</span> Galaxy in the constellation Pisces

NGC 7714 is a spiral galaxy in the constellation Pisces. Its velocity with respect to the cosmic microwave background is 2430 ± 26 km/s, which corresponds to a Hubble distance of 116.9 ± 8.3 Mly (35.85 ± 2.54 Mpc). In addition, five non-redshift measurements give a distance of 92.24 ± 8.69 Mly (28.280 ± 2.664 Mpc). It was discovered by British astronomer John Herschel on 18 September 1830.

<span class="mw-page-title-main">NGC 3938</span> Galaxy in the constellation Ursa Major

NGC 3938 is an unbarred spiral galaxy in the Ursa Major constellation. It was discovered on 6 February 1788 by William Herschel. It is one of the brightest spiral galaxies in the Ursa Major South galaxy group and is roughly 67,000 light years in diameter. It is approximately 43 million light years away from Earth. NGC 3938 is classified as type Sc under the Hubble sequence, a loosely wound spiral galaxy with a smaller and dimmer bulge. The spiral arms of the galaxy contain many areas of ionized atomic hydrogen gas, more so towards the center.

<span class="mw-page-title-main">NGC 6221</span> Galaxy in the constellation Ara

NGC 6221 is a barred spiral galaxy located in the constellation Ara. In de Vaucouleurs' galaxy morphological classification scheme, it is classified as SB(s)bc and was discovered by British astronomer John Herschel on 3 May 1835. NGC 6221 is located at about 69 million light years from Earth.

<span class="mw-page-title-main">NGC 1084</span> Galaxy in the constellation Eridanus

NGC 1084 is an unbarred spiral galaxy in the constellation Eridanus. It is located at a distance of about 63 million light-years away from the Milky Way. The galaxy was discovered by William Herschel on 10 January 1785. It has multiple spiral arms, which are not well defined. It belongs in the same galaxy group with NGC 988, NGC 991, NGC 1022, NGC 1035, NGC 1042, NGC 1047, NGC 1052 and NGC 1110. This group is in turn associated with the Messier 77 group.

<span class="mw-page-title-main">NGC 908</span> Spiral galaxy in the constellation Cetus

NGC 908 is an unbarred spiral galaxy in the constellation Cetus. It was discovered on 20 September 1786 by William Herschel. This galaxy is 56 million light years away from Earth. It is the main galaxy in the NGC 908 group, which also includes NGC 899, NGC 907, and IC 223.

<span class="mw-page-title-main">NGC 1961</span> Galaxy in the constellation Camelopardis

NGC 1961 is a spiral galaxy in the constellation Camelopardalis. It was discovered by William Herschel on 3 December 1788. It is at a distance of about 200 million light years from Earth, which, given its apparent dimensions, means that NGC 1961 is more than 220,000 light years across.

<span class="mw-page-title-main">NGC 132</span> Spiral galaxy in the constellation Cetus

NGC 132 is a spiral galaxy in the constellation Cetus. Its velocity with respect to the cosmic microwave background is 5015 ± 25 km/s, which corresponds to a Hubble distance of 241.3 ± 16.9 Mly (73.97 ± 5.19 Mpc). In addition, three non redshift measurements give a distance of 250.81 ± 2.14 Mly (76.900 ± 0.656 Mpc). It was discovered on 25 December 1790 by German-British astronomer William Herschel.

<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 521</span> Spiral galaxy in the constellation Cetus

NGC 521, also occasionally referred to as PGC 5190 or UGC 962, is a barred spiral galaxy located approximately 224 million light-years from the Solar System in the constellation Cetus. It was discovered on 8 October 1785 by astronomer William Herschel.

<span class="mw-page-title-main">NGC 681</span> Spiral galaxy in the constellation Cetus

NGC 681 is an intermediate spiral galaxy in the constellation of Cetus, located approximately 66.5 million light-years from Earth.

<span class="mw-page-title-main">NGC 6907</span> Galaxy in the constellation Capricornus

NGC 6907 is a spiral galaxy located in the constellation Capricornus. It is located at a distance of about 120 million light-years from Earth, which, given its apparent dimensions, means that NGC 6907 is about 115,000 light-years across. It was discovered by William Herschel on July 12, 1784. The total infrared luminosity of the galaxy is 1011.03 L☉, and thus it is categorised as a luminous infrared galaxy.

<span class="mw-page-title-main">NGC 788</span> Galaxy in the constellation Cetus

NGC 788 is a lenticular galaxy located in the constellation Cetus. Its velocity with respect to the cosmic microwave background is 3938 ± 30 km/s, which corresponds to a Hubble distance of 189.4 ± 13.4 Mly (58.08 ± 4.10 Mpc). It was discovered in a sky survey by Wilhelm Herschel on September 10, 1785.

<span class="mw-page-title-main">NGC 7541</span> Galaxy in the constellation Pisces

NGC 7541 is a barred spiral galaxy located around 104 million light-years away in the constellation Pisces. It was discovered in 1785 by William Herschel, and it is 106,000 light-years across. NGC 7541 is known to have lots of star-forming regions.

<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. It was discovered by German-British astronomer William Herschel on 20 March 1786.

<span class="mw-page-title-main">NGC 664</span> Galaxy in the constellation Pisces

NGC 664 is a spiral galaxy in the constellation of Pisces. Its velocity with respect to the cosmic microwave background is 5137 ± 21 km/s, which corresponds to a Hubble distance of 247.1 ± 17.3 Mly (75.77 ± 5.31 Mpc). In addition, six non redshift measurements give a distance of 218.91 ± 3.66 Mly (67.117 ± 1.123 Mpc). It was discovered by British astronomer John Herschel on 24 September 1830.

<span class="mw-page-title-main">NGC 735</span> Galaxy in the constellation Triangulum

NGC 735 is a spiral galaxy in the constellation of Triangulum. Its velocity with respect to the cosmic microwave background is 4374 ± 18 km/s, which corresponds to a Hubble distance of 210.4 ± 14.7 Mly (64.52 ± 4.52 Mpc). In addition, eight non redshift measurements give a distance of 227.21 ± 7.99 Mly (69.662 ± 2.449 Mpc). The galaxy was discovered by German-British astronomer William Herschel on 13 September 1784).

<span class="mw-page-title-main">NGC 4246</span> Galaxy in the constellation Virgo

NGC 4246 is a spiral galaxy in the constellation of Virgo. Its velocity with respect to the cosmic microwave background is 4064 ± 24 km/s, which corresponds to a Hubble distance of 195.5 ± 13.7 Mly (59.94 ± 4.21 Mpc). However, 20 non-redshift measurements give a distance of 172.01 ± 10.57 Mly (52.740 ± 3.241 Mpc). It was discovered by German-British astronomer William Herschel on 13 April 1784. It was also observed by German astronomer Arnold Schwassmann on 30 October 1899 and listed in the Index Catalogue as IC 3113.

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. ↑ 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.
  7. ↑ "SN 1998dt". Transient Name Server. IAU . Retrieved 12 December 2024.
  8. ↑ "SN 2020obd". Transient Name Server. IAU . Retrieved 5 September 2024.
  9. ↑ 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.
  10. 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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