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]
| NGC 3746 | |
|---|---|
 Image of NGC 3746 located bottom right below NGC 3745 which was taken by Mount Lemmon Observatory | |
| Observation data | |
| 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 | |
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]