20h21m43.01s, +37° 22′ 13.8″| Berkeley 87 | |
|---|---|
 | |
| Observation data (J2000 epoch) | |
| Right ascension | 20h21m 43.01s[1] |
| Declination | +37° 22′ 13.8″[1] |
| Distance | ~1650 pc |
| Apparent dimensions (V) | 8 |
| Physical characteristics | |
| Other designations | Dolidze 7, OCl 161, C 2019+372, OCISM 34, MWSC 3325 |
| Associations | |
| Constellation | Cygnus |
| See also: Open cluster, List of open clusters | |
Berkeley 87 is an open cluster in a heavily obscured region of the Milky WayinCygnus.[2] The rare WO type Wolf–Rayet star WR 142 is a member of Berkeley 87.[3]
This cluster contains HD 229059 which, as of August 2021, is the nearest known star to Earth with a bolometric luminosity greater than 1 million L☉.[citation needed]
| Star name | Effective temperature | Absolute magnitude | Bolometric magnitude | Mass (M☉) | Spectral type |
|---|---|---|---|---|---|
| WR 142 (Berkeley 87–29) | 200000 K | -3.13 | -10.1 | 28.6 | WO2 |
| HD 229059 (Berkeley 87–3) | 26300 K | -7.7 | -10.3 | 69 | B1Ia |
| Berkeley 87-25 | 35700 K | -5.6 | -9.1 | 39 | O8.5III |
| Berkeley 87-15 | 37800 K | -5 | -8.6 | 34 | B[e] |
| Berkeley 87-4 | 29500 K | -5 | -7.9 | 23 | B0.2III |
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