NGC 7253

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NGC 7253
NGC 7253 PanS.jpg
The spiral galaxy pair NGC 7253 by the Pan-STARRS survey.
Observation data (J2000 epoch)
Constellation Pegasus
Right ascension 22h 19m 28.9s [1]
Declination 29° 23′ 30.0″ [1]
Redshift 0.015738 [1]
Heliocentric radial velocity 4718 km/s [1]
Distance 203.7  Mly (62.46  Mpc) & 200.4  Mly (61.43  Mpc) [1]
Apparent magnitude  (V)13.2 & 14.3 [1]
Characteristics
Type Double System [1]
Size~135,000  ly (41.40  kpc) & 71,400  ly (21.88  kpc) (estimated) [1]
Apparent size  (V)1.7' x 0.8' & 1.6' x 0.5' [1]
Other designations
VV 242, Arp 278, UGC 11984 & 11985, CGCG 494-14, MCG -5-52-10 & -5-52-11, PGC 68572 & 68573 [1]

NGC 7253 is a pair of spiral galaxies in the constellation Pegasus. It was discovered by the German-British astronomer Albert Marth on 9 September 1863. It is listed in Halton Arp's Atlas of Peculiar Galaxies as Arp 278, as an example of gravitationally interacting galaxies. [2]

Contents

Of the pair, the galaxy to the north is known individually as NGC 7253A. Its velocity relative to the cosmic microwave background is 4,235 ± 24 km/s, which corresponds to a Hubble distance of 62.5 ± 4.4 Mpc (∼204 million light-years). [1] The other galaxy in the pair is known individually as NGC 7253B. Its velocity relative to the cosmic microwave background is 4,165 ± 24 km/s, which corresponds to a Hubble distance of 61.4 ± 4.3 Mpc (∼200 million light-years). [1]

With a surface brightness equal to 14.06 Mag/arcsec 2, NGC 7253B can be described as a low surface brightness galaxy.

According to the Simbad database, NGC 7253 is a candidate for the title of active galaxy nucleus. [3]

One supernova has been observed in NGC 7253B: SN 2002jg (type Ia, mag. 17). [4]

See also

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References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 "NASA/IPAC Extragalactic Database". Results for NGC 7253. Retrieved 16 July 2024.
  2. ↑ Courtney Seligman. "Celestial Atlas Table of Contents, NGC 7250 - 7299" . Retrieved 17 July 2024..
  3. ↑ SIMBAD entry for NGC 7253 Retrieved 17 July 2024.
  4. ↑ Transient Name Server entry for SN 2002jg. Retrieved 16 July 2024.
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