Hoag's Object | |
---|---|
Observation data (J2000 epoch) | |
Constellation | Serpens Caput |
Right ascension | 15h 17m 14.4s[1] |
Declination | +21° 35′ 08″[1] |
Redshift | 12740±50 km/s[1][2] |
Distance | 612.8±9.4 Mly (187.9±2.9 Mpc)[2][a] |
Apparent magnitude (B) | 16.2[1] |
Characteristics | |
Type | (RP)E0 or (RP)SA0/a[3] |
Size | 45.41 kiloparsecs (148,000 light-years)[1][4] (diameter; D25 isophote) |
Apparent size (V) | 0.28′ × 0.28′[1] |
Notable features | Ring galaxy |
Other designations | |
PGC 54559,[1] PRC D-51[1] |
Hoag's Object is an unusual ring galaxy in the constellation of Serpens Caput.[5] It is named after Arthur Hoag, who discovered it in 1950 and identified it as either a planetary nebula or a peculiar galaxy.[6] The galaxy has a D25 isophotal diameter of 45.41 kiloparsecs (148,000 light-years).[1]
OConnelletal1974
was invoked but never defined (see the help page).