Perseus OB1
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), and has lent its name to the Perseus Arm of the Milky Way. The brightest member of the association is the blue supergiant 9 Persei.
| Perseus OB1 | |
|---|---|
| Observation data (J2000 epoch) | |
| Constellation | Perseus |
| Right ascension | 02h 21m |
| Declination | +57.6° |
| Mean distance | 6.0 kly (1.83 kpc) |
| Span | 1,000 × 750 light years |
| Radial velocity | −43.4 km/s |
| Physical characteristics | |
| Members | 149 |
| OB stars | ≥65 |
| Other designations | Per OB1 |
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