WR 142
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 21m 44.345s |
| Declination | +37° 22′ 30.56″ |
| Apparent magnitude (V) | 12.94 |
| Characteristics | |
| Spectral type | WO2 |
| Apparent magnitude (J) | 9.538 |
| Apparent magnitude (H) | 8.889 |
| Apparent magnitude (K) | 8.596 |
| U−B color index | −0.29 |
| B−V color index | +1.43 |
| Astrometry | |
| Proper motion (μ) | RA: −6.270 mas/yr Dec.: −3.422 mas/yr |
| Parallax (π) | 0.5755±0.0284 mas |
| Distance | 1,650+110 −90 pc |
| Absolute magnitude (MV) | −3.13 |
| Details | |
| Mass | 28.6 M☉ |
| Radius | 0.80 R☉ |
| Luminosity (bolometric) | 912,000 L☉ |
| Temperature | 200,000 K |
| Metallicity [Fe/H] | 0.0 dex |
| Rotational velocity (v sin i) | 1,000 km/s |
| Other designations | |
| WR 142, 2MASS J20214434+3722306, GSC 02684-00001, Sand 5, St 3, UCAC2 44891902 | |
| Database references | |
| SIMBAD | data |
WR 142 is a Wolf-Rayet star in the constellation Cygnus, an extremely rare star on the WO oxygen sequence. It is a luminous and very hot star, highly evolved and close to exploding as a supernova. It is suspected to be a binary star with a companion orbiting about 1 AU away.