NGC 4708
Galaxy in the constellation Virgo
From Wikipedia, the free encyclopedia
NGC 4708 is a peculiar spiral galaxy in the constellation of Virgo. Its velocity with respect to the cosmic microwave background is 4,505±25 km/s, which corresponds to a Hubble distance of 216.7 ± 15.2 Mly (66.44 ± 4.67 Mpc).[1] However, 15 non-redshift measurements give a closer mean distance of 204.76 ± 19.97 Mly (62.780 ± 6.122 Mpc).[2] It was discovered by German-British astronomer William Herschel on 11 March 1788.[3]
| NGC 4708 | |
|---|---|
NGC 4708 imaged by Legacy Surveys | |
| Observation data (J2000 epoch) | |
| Constellation | Virgo |
| Right ascension | 12h 49m 41.4813s[1] |
| Declination | −11° 05′ 34.679″[1] |
| Redshift | 0.013900±0.0000270[1] |
| Heliocentric radial velocity | 4,167±8 km/s[1] |
| Distance | 204.76 ± 19.97 Mly (62.780 ± 6.122 Mpc)[1] |
| Group or cluster | Holm 463 |
| Apparent magnitude (V) | 13.1[1] |
| Characteristics | |
| Type | SA(r)ab pec[1] |
| Size | ~118,100 ly (36.22 kpc) (estimated)[1] |
| Apparent size (V) | 1.2′ × 0.9′[1] |
| Other designations | |
| HOLM 463A, IRAS 12470-1049, 2MASX J12494148-1105350, MCG -02-33-016, PGC 43382[1] | |
NGC 4708 has a possible active galactic 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.[4][5]
NGC 4708 and neighboring galaxy LEDA 970118 are listed together as Holm 463 in Erik Holmberg's A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937.[6]
Supernovae
Three supernovae have been observed in NGC 4708:
- SN 2003ef (Type II, mag. 16.3) was discovered by LOTOSS (Lick Observatory and Tenagra Observatory Supernova Searches) on 11 May 2003.[7][8]
- SN 2005bo (Type Ia, mag. 15.3) was discovered by Tim Puckett and Alex Langoussis on 17 April 2005.[9][10]
- SN 2016cvn (Type Ia, mag. 17.97) was discovered by ATLAS on 5 June 2016.[11][12][13]