NGC 2708

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NGC 2708
NGC 2708 PanS.jpg
The spiral galaxy NGC 2708
Observation data (J2000 epoch)
Constellation Hydra
Right ascension 08h 56m 08.0688s [1]
Declination −03° 21′ 36.467″ [1]
Redshift 0.006698 [1]
Heliocentric radial velocity 2008 ± 5 km/s [1]
Distance 111.4 ± 7.9  Mly (34.15 ± 2.41  Mpc) [1]
Group or cluster NGC 2708 Group (LGG 164)
Apparent magnitude  (V)12.0 [1]
Characteristics
Type SAB(s)b pec? [1]
Size~98,800  ly (30.29  kpc) (estimated) [1]
Apparent size  (V)2.7′ × 1.4′ [1]
Other designations
IRAS 08535-0309, 2MASX J08560804-0321363, NGC 2727, MCG +00-23-015, PGC 25097, CGCG 005-034 [1]

NGC 2708 is a spiral galaxy in the constellation of Hydra. Its velocity with respect to the cosmic microwave background is 2315 ± 22 km/s, which corresponds to a Hubble distance of 34.15 ± 2.41 Mpc (∼111 million light-years). [1] It was discovered by German-British astronomer William Herschel on 6 January 1785. [2] This galaxy was also observed by British astronomer John Herschel on 12 March 1826, and later listed as NGC 2727. [2]

Contents

The SIMBAD database lists NGC 2708 as a Seyfert II galaxy, [3] i.e. a galaxy with a quasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.

One supernova has been observed in NGC 2708: SN 2023bee (type Ia, mag. 17.2621) was discovered by the Distance Less Than 40 Mpc Survey (DLT40) on 1 February 2023. [4]

NGC 2708 Group

According to A.M. Garcia, NGC 2708 is the namesake of the four member NGC 2708 group (also known as LGG 164). The other three galaxies are: NGC 2695, NGC 2699, and NGC 2706. [5]

See also

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<span class="mw-page-title-main">NGC 1493</span> Galaxy in the constellation Horologium

NGC 1493 is a barred spiral galaxy in the constellation of Horologium. Its velocity with respect to the cosmic microwave background is 1004 ± 4 km/s, which corresponds to a Hubble distance of 48.3 ± 3.4 Mly (14.81 ± 1.04 Mpc). In addition, six non redshift measurements give a distance of 35.38 ± 1.71 Mly (10.848 ± 0.525 Mpc). The galaxy was discovered by Scottish astronomer James Dunlop on 2 September 1826.

<span class="mw-page-title-main">NGC 4273</span> Galaxy in the constellation Virgo

NGC 4273 is a barred spiral galaxy in the constellation of Virgo. Its velocity with respect to the cosmic microwave background is 2727 ± 24 km/s, which corresponds to a Hubble distance of 131.2 ± 9.3 Mly (40.23 ± 2.84 Mpc). However, 20 non-redshift measurements give a distance of 94.72 ± 4.68 Mly (29.040 ± 1.435 Mpc). It was discovered by German-British astronomer William Herschel on 17 April 1786.

References

  1. 1 2 3 4 5 6 7 8 9 10 11 "Results for NGC 2708". NASA/IPAC Extragalactic Database. NASA and Caltech . Retrieved 8 August 2024.
  2. 1 2 Seligman, Courtney. "New General Catalogue Objects: NGC 2708". Celestial Atlas. Retrieved 10 September 2024.
  3. ↑ "NGC 2708". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 10 September 2024.
  4. ↑ "SN 2023bee". Transient Name Server. IAU . Retrieved 10 September 2024.
  5. ↑ Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47. Bibcode:1993A&AS..100...47G.
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