NGC 3746

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]

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]

The luminosity class of NGC 3746 is II and it has a broad H II region with a recessed core (RET). ^[1]

Copeland Septet

Copeland Septet with NGC 3746 in bottom right, imaged by Mount Lemmon Observatory

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]}

References

1. "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2024-05-01.
2. "HyperLeda -object description". atlas.obs-hp.fr. Retrieved 2024-05-01.
3. Astronomy, Go. "NGC 3746 | galaxy in Leo | NGC List | GO ASTRONOMY". Go-Astronomy.com. Retrieved 2024-05-01.
4. "New General Catalog Objects: NGC 3700 - 3749". cseligman.com. Retrieved 2024-05-01.
5. Bakich, Michael E. (2024-01-01). "Copeland's Septet". Astronomy Magazine. Retrieved 2024-05-01.
6. "Copeland's Septet (Hickson Compact Group 57) – Constellation Guide". www.constellation-guide.com. Retrieved 2024-05-01.
7. "SN 2002ar | Transient Name Server". www.wis-tns.org. Retrieved 2024-05-01.
8. Li, W. D. (2002). "Supernova 2002ar in NGC 3746". International Astronomical Union Circular (7819): 1. Bibcode:2002IAUC.7819....1L.
9. Filippenko, A. V.; Chornock, R. (2002-02-01). "Supernovae 2002ao, 2002ap, 2002ar, 2002au, 2002av". International Astronomical Union Circular (7825): 1. Bibcode:2002IAUC.7825....1F. ISSN   0081-0304.
10. "SN 2005ba | Transient Name Server". www.wis-tns.org. Retrieved 2024-05-01.
11. Kildahl, S.; Danielsen, A.; Steine, M.; Trondal, O. (2005-04-01). "Supernova 2005ba in NGC 3746". International Astronomical Union Circular (8503): 2. Bibcode:2005IAUC.8503....2K. ISSN   0081-0304.
12. "Bright Supernovae - 2005". www.rochesterastronomy.org. Retrieved 2024-05-01.
13. Foley, R. J.; Ganeshalingam, M.; Wong, D. S.; Swift, B. J.; Filippenko, A. V. (2005-04-01). "Supernova 2005ba in NGC 3746". International Astronomical Union Circular (8510): 2. Bibcode:2005IAUC.8510....2F. ISSN   0081-0304.