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NGC 5939
NGC 5939
	The spiral galaxy NGC 5939
Observation data (J2000 epoch)
Constellation	Ursa Minor
Right ascension	15h 24m 45.9753s
Declination	+68° 43′ 50.69″
Redshift	0.022235
Heliocentric radial velocity	6666 ± 4 km/s
Distance	321.6 ± 22.5 Mly (98.59 ± 6.90 Mpc)
Group or cluster	NGC 5939 Group
Apparent magnitude (V)	13.1
Characteristics
Type	S?
Size	~102,500 ly (31.44 kpc) (estimated)
Apparent size (V)	0.9′ × 0.5′
Other designations
	IRAS 15244+6854, 2MASX J15244604+6843501, UGC 9854, MCG +12-15-007, PGC 55022, CGCG 338-008

NGC 5939 is a spiral galaxy in the constellation of Ursa Minor. Its velocity with respect to the cosmic microwave background is 6684 ± 4 km/s, which corresponds to a Hubble distance of 98.59 ± 6.90 Mpc (∼322 million light-years).^[1] It was discovered by American astronomer Lewis Swift on 11 July 1883.^[2]

Supernovae

Three supernovae have been observed in NGC 5939:

SN 2004ax (type Ib/c, mag. 17.7) was discovered by the Lick Observatory Supernova Search (LOSS) on 21 March 2004.^[3]^[4] The spectrum indicated this might be a calcium-rich supernova.^[5]
SN 2019gss (type II-P, mag. 19.28) was discovered by the Zwicky Transient Facility on 30 may 2019.^[6]
SN 2023gps (type Ia, mag. 20) was discovered by the Automatic Learning for the Rapid Classification of Events (ALeRCE) on 23 April 2023.^[7]

NGC 5939 is part of a trio of galaxies: The other two galaxies in the group are IC 1129 and UGC 9896.^[8]

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k "Results for object NGC 5939". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 10 August 2024.
^ Seligman, Courtney. "NGC 5939". Celestial Atlas. Retrieved 10 August 2024.
^ Singer, D.; Li, W.; Boles, T. (2004). "Supernovae 2004ax and 2004ay". International Astronomical Union Circular (8311): 1. Bibcode:2004IAUC.8311....1S.
^ "SN 2004ax". Transient Name Server. IAU. Retrieved 16 December 2024.
^ Filippenko, A. V.; Desroches, L.; Ganeshalingam, M.; Chornock, R.; Serduke, F. J. D. (2004). "Supernovae 2004ax, 2004aw, 2004bh, 2004bi, 2004bj, and 2004bk". International Astronomical Union Circular (8331): 2. Bibcode:2004IAUC.8331....2F.
^ "SN 2019gss". Transient Name Server. IAU. Retrieved 16 December 2024.
^ "SN 2023gps". Transient Name Server. IAU. Retrieved 16 December 2024.
^ Mahtessian, Abraham (July 1998). "Groups of galaxies. III. Some empirical characteristics" (PDF). Astrophysics. 41 #3: 308–321. doi:10.1007/BF03036100. Retrieved 10 August 2024.