WR 140
This July 2022 image by the James Webb Space Telescope's Mid-Infrared Instrument shows WR 140 and its nebula. | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 20m 27.97608s |
| Declination | +43° 51′ 16.2802″ |
| Apparent magnitude (V) | 6.85 |
| Characteristics | |
| Spectral type | WC7pd + O5.5fc |
| Apparent magnitude (J) | 5.547 |
| Apparent magnitude (K) | 5.037 |
| U−B color index | −0.35 |
| B−V color index | +0.40 |
| Variable type | WR |
| Astrometry | |
| Radial velocity (Rv) | 3.10 km/s |
| Proper motion (μ) | RA: −4.275±0.027 mas/yr Dec.: −1.874±0.026 mas/yr |
| Parallax (π) | 0.5378±0.0237 mas |
| Distance | 1,518±21 pc |
| Absolute magnitude (MV) | WR: −6.6 to −4.8 O: −6.11 to −5.94 |
| Orbit | |
| Primary | O |
| Name | WR |
| Period (P) | 2,895.00±0.29 d |
| Semi-major axis (a) | 0.008922±0.000067" (13.55±0.21 au) |
| Eccentricity (e) | 0.8993±0.0013 |
| Inclination (i) | 119.07±0.88° |
| Longitude of the node (Ω) | 353.87±0.67° |
| Periastron epoch (T) | MJD 60,636.23±0.53 |
| Argument of periastron (ω) (secondary) | 227.44±0.52° |
| Semi-amplitude (K1) (primary) | 26.50±0.48 km/s |
| Semi-amplitude (K2) (secondary) | −75.25±0.63 km/s |
| Details | |
| WR | |
| Mass | 10.31±0.45 M☉ |
| Luminosity | 537,000 L☉ |
| Temperature | 70,000 K |
| O | |
| Mass | 29.27±1.14 M☉ |
| Radius | 35 R☉ |
| Luminosity | 1.6 million L☉ |
| Temperature | 35,000 K |
| Other designations | |
| V1687 Cygni, BD+43°3571, HD 193793, HIP 100287, TYC 3164-1678-1, SBC9 1232, WDS J20205+4351, 2MASS J20202798+4351164 | |
| Database references | |
| SIMBAD | data |
WR 140 is a spectroscopic binary containing an O-type star and a Wolf–Rayet star. It is located in the constellation of Cygnus, lying in the sky at the centre of the triangle formed by Deneb, γ Cygni and δ Cygni.