NGC 3780
Galaxy in the constellation Ursa Major
From Wikipedia, the free encyclopedia
NGC 3780 is a spiral galaxy in the constellation of Ursa Major. Its velocity with respect to the cosmic microwave background is 2,557±12 km/s, which corresponds to a Hubble distance of 123.0 ± 8.6 Mly (37.71 ± 2.65 Mpc).[1] However, 10 non-redshift measurements give a closer mean distance of 109.65 ± 9.10 Mly (33.620 ± 2.789 Mpc).[2] It was discovered by German-British astronomer William Herschel on 14 April 1789.[3]
| NGC 3780 | |
|---|---|
NGC 3780 imaged by SDSS | |
| Observation data (J2000 epoch) | |
| Constellation | Ursa Major |
| Right ascension | 11h 39m 22.3603s[1] |
| Declination | +56° 16′ 14.452″[1] |
| Redshift | 0.007976±0.00000667[1] |
| Heliocentric radial velocity | 2,391±2 km/s[1] |
| Distance | 109.65 ± 9.10 Mly (33.620 ± 2.789 Mpc)[1] |
| Group or cluster | NGC 3780 group (LGG 247) |
| Apparent magnitude (V) | 12.16[1] |
| Characteristics | |
| Type | SA(s)c[1] |
| Size | ~98,900 ly (30.32 kpc) (estimated)[1] |
| Apparent size (V) | 3.1′ × 2.5′[1] |
| Other designations | |
| IRAS 11366+5632, UGC 6615, MCG +09-19-150, PGC 36138, CGCG 292-014[1] | |
NGC 3780 is a is a LINER galaxy, i.e. a galaxy whose nucleus has an emission spectrum characterized by broad lines of weakly ionized atoms.[4][5] It also has an active galaxy nucleus, i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.[6][4]
NGC 3780 group
According to A. M. Garcia, NGC 3780 is the namesake of a small group of galaxies. The NGC 3780 group (also known as LGG 247) includes at least four galaxies, including NGC 3888, UGC 6596, and UGC 6774.[7][8]
Supernovae
Three supernovae have been observed in NGC 3780:
- SN 1978H (Type II, mag. 16.5) was discovered by Swiss astronomer Paul Wild on 7 November 1978.[9][10][11]
- SN 1992bt (Type II, mag. 16) was discovered by the Leuschner Observatory Supernova Search on 19 December 1992.[12][13][14]
- SN 2024btj (Type II, mag. 18.53) was discovered by the Xingming Observatory Sky Survey (XOSS) on 5 February 2024.[15][16]
