Perseus OB1 is an OB association in the Northern Celestial Hemisphere in the constellation Perseus. It is centered around the double cluster (NGC 869 and NGC 884),[6] and has lent its name to the Perseus Arm of the Milky Way.[8] The brightest member of the association is the blue supergiant 9 Persei.[4]
Perseus OB1 | |
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Observation data (J2000 epoch) | |
Constellation | Perseus |
Right ascension | 02h 21m [1][2] |
Declination | +57.6°[1][2] |
Mean distance | 6.0 kly (1.83 kpc)[3] |
Span | 1,000 × 750 light years[4] |
Radial velocity | −43.4[5] km/s |
Physical characteristics | |
Members | 149[6] |
OB stars | ≥65[7] |
Other designations | Per OB1[1] |