NGC 7722
NGC 7722 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
Constellation	Pegasus
Right ascension	23h 38m 41.2192s[1]
Declination	+15° 57′ 17.207″[1]
Redshift	0.013353±0.00000667[1]
Heliocentric radial velocity	4,003±2 km/s[1]
Distance	175.0 ± 12.3 Mly (53.67 ± 3.78 Mpc)[1]
Group or cluster	NGC 7711 group (LGG 477)
Apparent magnitude (V)	13.3g[1]
Characteristics
Type	S0/a[1]
Size	~122,600 ly (37.58 kpc) (estimated)[1]
Apparent size (V)	1.69′ × 1.19′[1]
Other designations
IRAS 23361+1540, 2MASX J23384119+1557174, UGC 12718, MCG +03-60-017, PGC 71993, CGCG 455-035[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 [fr], UGC 12633 [d], UGC 12640 [d], UGC 12653 [d], and UGC 12673 [d].^[5][6]

Supernova

One supernova has been observed in NGC 7722:

• SN 2020ssf (Type Ia, mag. 17.94) was discovered by the Zwicky Transient Facility on 6 September 2020.^[7]

See also

• List of NGC objects (7001–7840)

References

External links

• Media related to NGC 7722 at Wikimedia Commons
• NGC 7722 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images