IC 4182

IC 4182 is a Magellanic spiral galaxy in the constellation Canes Venatici. The galaxy lies about 14 million light years away from Earth, which means, given its apparent dimensions, that IC 4182 is approximately 28,000 light years across.^[1] It was discovered by German astronomer Max Wolf on 21 March 1903.^[3][2]

IC 4182
IC 4182 imaged by Kitt Peak National Observatory
Observation data (J2000 epoch)
Constellation	Canes Venatici
Right ascension	13h 05m 48.7008s[1]
Declination	+37° 36′ 12.996″[1]
Redshift	0.001071 ± 0.000003 [1]
Heliocentric radial velocity	321 ± 1 km/s[1]
Distance	13.7 ± 2.6 Mly (4.2 ± 0.79 Mpc)[1]
Apparent magnitude (V)	11.4[2]
Characteristics
Type	SA(s)m [1]
Size	~27,900 ly (8.55 kpc) (estimated)[1]
Apparent size (V)	6.0′ × 5.5′[1]
Other designations
IRAS F13035+3752, UGC 8188, MCG +06-29-031, PGC 45314, CGCG 189-020[1]

IC 4182 is seen nearly face-on. It has a low surface brightness disk with patch of star formation and no spiral pattern.^[4] The galaxy is close enough for its brightest stars to be resolvable through large telescopes, having a photometric blue filter apparent magnitude of 19.2,^[5] and a visual magnitude of around 20 for the brightest blue stars and around 21 for the brightest red stars.^[6] The density of ultraviolet sources decreases monotonically with radius.^[7]

A light curve for SN 1937C, plotted from data published by Baade & Zwicky (1938)^[5]

IC 4182 has been the home of one supernova, SN 1937C (type Ia, mag. 8.4).^[8] Fritz Zwicky discovered the supernova, which was located 30 arcseconds north and 40 arcseconds east of the nucleus, on 24 August 1937.^[2] The supernova was a few days post maximum.^[5] The peak apparent B-magnitude was estimated to have been 8.7.^[9] The galaxy was observed by the Hubble Space Telescope, leading to the discovery of Cepheid variable stars within it. SN 1937C then became the first type Ia supernova to have its distance calibrated with Cepheid stars, and then used as standard candles to calculate the Hubble constant.^[10]

The galaxy is considered to be a member of the M94 Group,^[11] while Garcia considered the galaxy to be a member of the LGG 334 group, along with NGC 5005 and NGC 5033.^[12]