NGC 3746
Galaxy in the constellation Leo
From Wikipedia, the free encyclopedia
NGC 3746 is a large barred spiral galaxy with a ring structure[2] located in the Leo constellation.[3] It is located 449 million light-years from the Solar System and has an approximate diameter of 45,000 light-years.[1] 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 | |
|---|---|
NGC 3746 (center) with NGC 3745 (left), imaged by Kitt Peak National Observatory | |
| Observation data (J2000 epoch) | |
| Constellation | Leo |
| Right ascension | 11h 37m 43.6312s[1] |
| Declination | +22° 00′ 35.153″[1] |
| Redshift | 0.030072[1] |
| Heliocentric radial velocity | 9,015 ± 2 km/s[1] |
| Distance | 449.2 ± 31.5 Mly (137.72 ± 9.65 Mpc)[1] |
| Group or cluster | Copeland Septet |
| Apparent magnitude (V) | 15.01[1] |
| Characteristics | |
| Type | SB(r)b[1] |
| Size | ~44,400 ly (13.62 kpc) (estimated)[1] |
| Apparent size (V) | 1.1′ × 0.5′[1] |
| Other designations | |
| Copeland Septet NED02, HCG 057B, 2MASS J11374363+2200353, 2MASX J11374364+2200349, UGC 6597, LEDA 35997, MCG +04-28-005, PGC 35997, CGCG 127-006, SDSS J113743.62+220035.3[1] | |
The luminosity class of NGC 3746 is II and it has a broad H II region with a recessed core (RET).[1]
Copeland Septet
NGC 3746 is a member of the Copeland Septet which comprises 7 galaxies discovered by Copeland in 1874.[5] The other 6 members are NGC 3745, NGC 3748, NGC 3750, NGC 3751, NGC 3753, and NGC 3754. Together, they are known as Hickson 57 and Arp 320.[6]
Supernovae
Two supernovae have been discovered in NGC 3746:
- SN 2002ar (Type Ia, mag. 16.5)[7] 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.[8] It was located 3".3 east and 0".5 south of the nucleus.[8][9]
- SN 2005ba (Type II, mag. 17.5)[10] 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.[11] It was located 14".6 west and 4".0 north of the nucleus.[12][13]