NGC 7769 is a spiral galaxy in the constellation of Pegasus. Its velocity with respect to the cosmic microwave background is 3855 ± 25 km/s, which corresponds to a Hubble distance of 56.85 ± 4.00 Mpc (∼185 million light-years).[1] It was discovered by German-British astronomer William Herschel on 18 September 1784.[2]

NGC 7769
The spiral galaxy NGC 7769.
Observation data (J2000 epoch)
ConstellationPegasus
Right ascension23h 51m 03.97s[1]
Declination+20° 09′ 01.5″[1]
Redshift0.014046[1]
Heliocentric radial velocity6580 ± 10 km/s[1]
Distance185.4 ± 13.0 Mly (56.85 ± 4.00 Mpc)[1]
Apparent magnitude (V)12.0[1]
Characteristics
Type(R)SA(rs)b[1]
Size~176,600 ly (54.14 kpc) (estimated)[1]
Apparent size (V)3.2' x 2.7'[1]
Other designations
IRAS 23485+1952, 2MASX J23510396+2009014, UGC 12808, MCG +03-60-030, PGC 72615, CGCG 455-054[1]

NGC 7769, together with NGC 7770 and NGC 7771, forms the galaxy trio Holm 820.[3] It also is listed as part of the five-member group LGG 483, also known as the NGC 7771 Group, which contains the 3 galaxies from Holm 820, NGC 7786, and UGC 12828.[4]

NGC 7769 is a LINER galaxy, i.e. it has a type of nucleus that is defined by its spectral line emission which has weakly ionized or neutral atoms, while the spectral line emission from strongly ionized atoms is relatively weak.[1]

Two supernovae have been observed in NGC 7769: SN 2019iex (type II, mag. 17.6)[5] and SN 2024grb (type II, mag. 18.2).[6]

See also

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References

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  1. ^ a b c d e f g h i j k l "NASA/IPAC Extragalactic Database". Results for NGC 7769. Retrieved 2 August 2024.
  2. ^ Celestial Atlas entry for NGC 7769. Retrieved 2 August 2024.
  3. ^ The Webb Deep-Sky Society entry for NGC 7771 Trio in Pegasus. Retrieved 2 August 2024.
  4. ^ 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.
  5. ^ Transient Name Server entry for SN 2019iex. Retrieved 2 August 2024.
  6. ^ Transient Name Server entry for SN 2024grb. Retrieved 2 August 2024.
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