NGC 1961

NGC 1961 is a spiral galaxy in the constellation Camelopardalis. It was discovered by German-British astronomer William Herschel on 3 December 1788.^[2] It was also observed by Guillaume Bigourdan on 22 December 1891, causing it to be listed in the Index Catalogue as IC 2133.^[2] Its velocity with respect to the cosmic microwave background for is 3,909±2 km/s, which corresponds to a Hubble distance of 188.0 ± 13.2 Mly (57.65 ± 4.04 Mpc).^[1] However, seven non redshift measurements give a much closer distance of 145.42 ± 27.36 Mly (44.586 ± 8.390 Mpc).^[3]

NGC 1961
NGC 1961 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
Constellation	Camelopardalis
Right ascension	05h 42m 04.6477s[1]
Declination	+69° 22′ 42.375″[1]
Redshift	0.013122[1]
Heliocentric radial velocity	3934 ± 1 km/s[1]
Distance	145.42 ± 27.36 Mly (44.586 ± 8.390 Mpc)[1]
Apparent magnitude (V)	10.9
Characteristics
Type	SAB(rs)c [1]
Size	~240,100 ly (73.62 kpc) (estimated)[1]
Apparent size (V)	4.6′ × 3.0′[1]
Other designations
IRAS 05365+6921, IC 2133, Arp 184, UGC 3334, MCG +12-06-007, PGC 17625, CGCG 329-008[1]

The galaxy has been distorted, however no companion has been detected nor double nuclei that could show a recent merger. Its outer arms are highly irregular. Two long straight arms extend from the north side of the galaxy.^[4] A luminous X-ray corona has been detected around the galaxy.^[5][6] NGC 1961 is the central member of the small group of nine galaxies, the NGC 1961 group.^[4]

Supernovae

Four supernovae have been observed in NGC 1961:

• SN 1998eb (Type Ia, mag. 17.8) was discovered by the Lick Observatory Supernova Search (LOSS) on 17 August 1998.^[7][8]
• SN 2001is (Type Ib, mag. 17.6) was discovered by BAO and LOTOSS (Lick Observatory and Tenagra Observatory Supernova Searches) on 22 December 2001.^[9][10]
• SN 2013cc (Type II, mag. 17) was discovered by Kōichi Itagaki on 28 April 2013.^[11][12]
• SN 2021vaz (Type II, mag. 17.5) was discovered by Kōichi Itagaki on 5 August 2021.^[13][14]

Gallery

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  NGC 1961 by GALEX
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  NGC 1961 by Mount Lemmon Observatory
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  NGC 1961 by DSS
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  NGC 1961 by Hubble Space Telescope