I Zwicky 18
| I Zwicky 18 | |
|---|---|
| Observation data (J2000 epoch) | |
| Constellation | Ursa Major |
| Right ascension | 09h 34m 02.0s |
| Declination | +55° 14′ 28″ |
| Redshift | 0.002585 |
| Heliocentric radial velocity | 774 km/s |
| Distance | 60.137 ± 13.604 Mly (18.438 ± 4.171 Mpc) |
| Apparent magnitude (V) | 15.98 |
| Characteristics | |
| Type | cI;Blue Compact Gal, WR, and AGN |
| Size | 5,150 ly × 3,650 ly (1.58 kpc × 1.12 kpc) (diameter; 25.0 B-mag arcsec−2) |
| Apparent size (V) | 2.0′ × 2.0′ |
| Other designations | |
| I ZW 018, 2MASS J09340202+5514272, UGCA 166, LEDA 27182, Mrk 116, PGC 27182, SDSS J093401.92+551427.9 | |
I Zwicky 18 is a blue compact dwarf and Wolf–Rayet galaxy located about 18.44 megaparsecs (60.14 million light-years) away in the constellation Ursa Major. The galaxy was first identified by Swiss astronomer Fritz Zwicky in a 1930s photographic survey of galaxies. It also possesses an active galactic nucleus.