NGC 4617
Galaxy in the constellation Canes Venatici
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NGC 4617 is a spiral galaxy in the constellation of Canes Venatici. Its velocity with respect to the cosmic microwave background is 4,831±13 km/s, which corresponds to a Hubble distance of 232.4 ± 16.3 Mly (71.25 ± 4.99 Mpc).[1] However, four non-redshift measurements give a closer mean distance of 198.96 ± 2.10 Mly (61.000 ± 0.644 Mpc).[2] It was discovered by German-British astronomer William Herschel on 9 March 1788.[3][4]
| NGC 4617 | |
|---|---|
NGC 4617 imaged by SDSS | |
| Observation data (J2000 epoch) | |
| Constellation | Canes Venatici |
| Right ascension | 12h 41m 05.8961s[1] |
| Declination | +50° 23′ 36.233″[1] |
| Redshift | 0.015506±0.00000634[1] |
| Heliocentric radial velocity | 4,649±2 km/s[1] |
| Distance | 198.96 ± 2.10 Mly (61.000 ± 0.644 Mpc)[1] |
| Apparent magnitude (V) | 13.9g[1] |
| Characteristics | |
| Type | Sb[1] |
| Size | ~179,400 ly (55.01 kpc) (estimated)[1] |
| Apparent size (V) | 2.61′ × 0.62′[1] |
| Other designations | |
| IRAS F12387+5040, UGC 7847, MCG +09-21-028, PGC 42530, CGCG 270-013[1] | |
NGC 4617 is an active galaxy nucleus candidate, 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.[5]
Supernovae
Two supernovae have been observed in NGC 4617:
