WR 138a

WR 138a
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]
Distance4200[3] pc
Details
Mass13[3] M☉
Radius9.4[3] R☉
Luminosity200,000[3] L☉
Temperature40,000[3] K
Age6.7[3] Myr
Other designations
HBHA 4202-22, 2MASS J20170811+4107270
Database references
SIMBADdata

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]

  1. ^ a b Cite error: The named reference gaia was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference flagey was invoked but never defined (see the help page).
  3. ^ a b c d e f g h Cite error: The named reference gvaramadze was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference edr3 was invoked but never defined (see the help page).