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NGC 3746
NGC 3746
	Image of NGC 3746 located bottom right below NGC 3745 which was taken by Mount Lemmon Observatory
Observation data (J2000 epoch)
Constellation	Leo
Right ascension	11hr 37m 43.622s
Declination	+22d 00m 35.38s
Redshift	0.030072
Heliocentric radial velocity	9,015 km/s
Distance	449 Mly (137.66 Mpc)
Group or cluster	Copeland Septet
Apparent magnitude (V)	15.0
Characteristics
Type	SB(r)b, RET
Size	165,000 ly
Other designations
	PGC 35997, UGC 6597, CGCG 127-006, MCG +04-28-005, Copeland Septet NED02, 2MASX J11374364+2200349, HCG 057B, 2MASS J11374363+2200353, WBL 343-001, NSA 139936, SDSS J113743.62+220035.3, LEDA 35997

NGC 3746 is a large barred spiral galaxy with a ring structure^[1] located in the Leo constellation.^[2] It is located 449 million light-years from the Solar System and has an approximate diameter of 165,000 light-years.^[3] NGC 3746 was discovered by Ralph Copeland on 9 February 1874 with subsequent observations made by Hermann Kobold, Lawrence Parsons and John Louis Emil Dreyer.^[4]

The luminosity class of NGC 3746 is II and it has a broad H II region with a recessed core (RET).^[3]

Supernovae

Two supernovae have been discovered in NGC 3746 so far: SN 2002ar and SN 2005ba.

SN 2002ar

SN 2002ar^[5] was discovered by Dr W.D. Li from the University of California, Berkeley via unfiltered CCD images which was taken by the 0.8-m Katzman Automatic Imagining Telescope on 3 and 4 February 2002.^[6] It was located 3".3 east and 0".5 south of the nucleus.^[6] The supernova was Type la.^[7]^[5]

SN 2005ba

SN 2005ba^[8] was discovered on 1 April 2005 by Norwegian scientists Arne Danielsen, Mikkel Steine, and Stale Kildahl via unfiltered images taken from a 'Celestron 14' reflector at Veggli, Norway.^[9] It was located 14".6 west and 4".0 north of the nucleus.^[10] The supernova was Type II.^[11]^[8]

Copeland Septet

NGC 3746 is a member of the Copeland Septet which comprises 7 galaxies discovered by Copeland in 1874.^[12] The other 6 members are NGC 3748, NGC 3754, NGC 3753, NGC 3750, NGC 3745 and NGC 3751. Together, they are known as Hickson 57 and Arp 320.^[13]