NGC 7253

NGC 7253
The spiral galaxy pair NGC 7253 by the Pan-STARRS survey.
Observation data (J2000 epoch)
ConstellationPegasus
Right ascension22h 19m 28.9s[1]
Declination29° 23′ 30.0″[1]
Redshift0.015738[1]
Heliocentric radial velocity4718 km/s[1]
Distance203.7 Mly (62.46 Mpc) & 200.4 Mly (61.43 Mpc)[1]
Apparent magnitude (V)13.2 & 14.3[1]
Characteristics
TypeDouble 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
Arp 278, UGC 11984 & 11985, MCG +05-52-010 & +05-52-011, PGC 68572 & 68573, CGCG 494-014, VV 242[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.[2] It is listed in Halton Arp's Atlas of Peculiar Galaxies as Arp 278, as an example of gravitationally interacting galaxies.[3]

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/arcsec2, 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.[4]

One supernova has been observed in NGC 7253B: SN 2002jg (type Ia, mag. 17).[5]

See also

References

  1. ^ a b c d e f g h i j k l "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. ^ Arp, Halton (1966). "Atlas of Peculiar Galaxies". The Astrophysical Journal Supplement Series. 14: 1. Bibcode:1966ApJS...14....1A. doi:10.1086/190147.
  4. ^ SIMBAD entry for NGC 7253 Retrieved 17 July 2024.
  5. ^ Transient Name Server entry for SN 2002jg. Retrieved 16 July 2024.

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