Astronomy:NGC 7722

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NGC 7722
A disc-shaped galaxy. It glows brightly at the centre and shines a faint white light all around it. The disc is made up of tightly-packed rings of dust, some darker and some lighter. Wide, long lanes of dark reddish dust cross the galaxy in front of its edge, blocking out some of its light; the long strands twist and break apart at each side. A couple of nearby stars and distant galaxies are also visible on the black background.
NGC 7722 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationPegasus
Right ascension 23h 38m 41.2192s[1]
Declination+15° 57′ 17.207″[1]
Redshift0.013353±0.00000667[1]
Helio radial velocity4,003±2 km/s[1]
Distance175.0 ± 12.3 Mly (53.67 ± 3.78 Mpc)[1]
Group or clusterNGC 7711 group (LGG 477)
Apparent magnitude (V)13.3g[1]
Characteristics
TypeS0/a[1]
Size~122,600 ly (37.58 kpc) (estimated)[1]
Apparent size (V)1.69′ × 1.19′[1]
Other designations
IRAS 23361+1540, UGC 12718, MCG+03-60-017, PGC 71993[1]

NGC 7722 is a lenticular galaxy in the constellation of Pegasus. Its velocity with respect to the cosmic microwave background is 3,639±26 km/s, which corresponds to a Hubble distance of 175.0 ± 12.3 Mly (53.67 ± 3.78 Mpc).[1] It was discovered by German astronomer Heinrich Louis d'Arrest on 12 August 1864.[2]

NGC 7722 is a LINER galaxy, i.e. a galaxy whose nucleus has an emission spectrum characterized by broad lines of weakly ionized atoms.[3][4]

NGC 7711 group

NGC 7722 is part of the NGC 7711 group (also known as LGG 477). This galaxy group contains seven members, including NGC 7691, NGC 7711, UGC 12633, UGC 12640, UGC 12653, and UGC 12673.[5][6]

Supernova

One supernova has been observed in NGC 7722:

See also

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Results for object NGC 7722". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+7722. 
  2. ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 7722". https://cseligman.com/text/atlas/ngc77.htm#7722. 
  3. ↑ Toba, Y.; Oyabu, S.; Matsuhara, H.; Malkan, M. A.; Gandhi, P.; Nakagawa, T.; Isobe, N.; Shirahata, M. et al. (2014). "Luminosity and Redshift Dependence of the Covering Factor of Active Galactic Nuclei viewed with WISE and Sloan Digital Sky Survey". The Astrophysical Journal 788 (1): 45. doi:10.1088/0004-637X/788/1/45. Bibcode: 2014ApJ...788...45T. 
  4. ↑ "NGC 7722". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+7722. 
  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. 
  6. ↑ "LGG 477". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=LGG+477. 
  7. ↑ "SN 2020ssf". IAU. https://www.wis-tns.org/object/2020ssf. 

Coordinates: Sky map 23h 38m 41.2192s, +15° 57′ 17.207″



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