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NGC 5939
The spiral galaxy NGC 5939
Observation data (J2000 epoch)
Constellation	Ursa Minor
Right ascension	15 24 45.9753
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). It was discovered by American astronomer Lewis Swift on 11 July 1883.

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. The spectrum indicated this might be a calcium-rich supernova.
• SN 2019gss (type II-P, mag. 19.28) was discovered by the Zwicky Transient Facility on 30 may 2019.
• SN 2023gps (type Ia, mag. 20) was discovered by the Automatic Learning for the Rapid Classification of Events (ALeRCE) on 23 April 2023.

NGC 5939 Group

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

See also

• List of NGC objects (5001–6000)

References

1. ^ "Results for object NGC 5939". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 10 August 2024.
2. Seligman, Courtney. "NGC 5939". Celestial Atlas. Retrieved 10 August 2024.
3. Singer, D.; Li, W.; Boles, T. (2004). "Supernovae 2004ax and 2004ay". International Astronomical Union Circular (8311): 1. Bibcode:2004IAUC.8311....1S.
4. "SN 2004ax". Transient Name Server. IAU. Retrieved 16 December 2024.
5. 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.
6. "SN 2019gss". Transient Name Server. IAU. Retrieved 16 December 2024.
7. "SN 2023gps". Transient Name Server. IAU. Retrieved 16 December 2024.
8. 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.

External links

• NGC 5939 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

v t e Constellation of Ursa Minor
List of stars in Ursa Minor Ursa Minor in Chinese astronomy
Stars	Bayer α (Polaris) β (Kochab) γ (Pherkad) δ (Yildun) ε ζ η θ λ π π Flamsteed 3 4 5 6 8 (Baekdu) 9 10 11 (γ) 12 14 17 19 20 24 Variable R S T U V W Z RR RU RW SS UY VX HR 5184 5596 HD 150706 Other Calvera H1504+65 LP 40-365 WD 1337+705 WISE 1506+7027
Exoplanets β Ursae Minoris b 8 Ursae Minoris b (Halla) 11 Ursae Minoris b TOI-4138 b
Galaxies	NGC 5034 5144 5939 6217 6251 6331 Other 3C 309.1
Galaxy clusters Abell 2256
Category

• NGC objects
• Principal Galaxies Catalogue objects
• MCG objects
• UGC objects
• IRAS catalogue objects
• Ursa Minor
• Astronomical objects discovered in 1883
• Discoveries by Lewis Swift
• Spiral galaxies