| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 17m 08.11932s[1] |
| Declination | +41° 07′ 26.99366″[1] |
| Apparent magnitude (V) | 15.44 |
| Characteristics | |
| Evolutionary stage | Wolf-Rayet |
| Spectral type | WN9h[2] |
| B−V color index | 1.81[3] |
| Astrometry | |
| Proper motion (μ) | RA: −4.568[4] mas/yr Dec.: −4.834[4] mas/yr |
| Parallax (π) | 0.0893 ± 0.0131 mas[4] |
| Distance | 4200[3] pc |
| Details | |
| Mass | 13[3] M☉ |
| Radius | 9.4[3] R☉ |
| Luminosity | 200,000[3] L☉ |
| Temperature | 40,000[3] K |
| Age | 6.7[3] Myr |
| Other designations | |
HBHA 4202-22, 2MASS J20170811+4107270 | |
| Database references | |
| SIMBAD | data |
WR 138a is a Wolf-Rayet star in the constellation Cygnus. It is of a very late spectral type of WN9h.[2] The WR is also at the centre of a ring nebula (typical of WRs) and is a runaway.[3]
gaia was invoked but never defined (see the help page).flagey was invoked but never defined (see the help page).gvaramadze was invoked but never defined (see the help page).edr3 was invoked but never defined (see the help page).