WR 140

WR 140

This image shows WR 140 and its nebula with JWST Mid-Infrared Instrument, taken in July 2022.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cygnus
Right ascension 20h 20m 27.97608s[1]
Declination +43° 51′ 16.2802″[1]
Apparent magnitude (V) 6.85[2]
Characteristics
Spectral type WC7pd + O5.5fc[3]
Apparent magnitude (J) 5.547[4]
Apparent magnitude (K) 5.037[5]
U−B color index −0.35[2]
B−V color index +0.40[2]
Variable type WR[6]
Astrometry
Radial velocity (Rv)3.10[7] km/s
Proper motion (μ) RA: -4.275 ±0.027 mas/yr[8]
Dec.: -1.874 ±0.026 mas/yr[8]
Parallax (π)0.5378 ± 0.0237 mas[8]
Distance1518 ± 21[9] pc
Absolute magnitude (MV)WR: −6.6 to −4.8
O: −6.11 to −5.94[10]
Orbit[9]
PrimaryO
CompanionWR
Period (P)2895.00±0.29 d
Semi-major axis (a)8.922±0.067"
(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 60636.23±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
Mass10.31 ± 0.45[9] M☉
Luminosity537,000[11] L☉
Temperature70,000[11] K
O
Mass29.27 ± 1.14[9] M☉
Radius35[11] R☉
Luminosity1,600,000[11] L☉
Temperature35,000[11] 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
SIMBADdata

WR 140 is a visually moderately bright Wolf–Rayet star placed within the spectroscopic binary star, SBC9 1232,[7] whose primary star is an evolved spectral class O4–5 star.[7] 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.

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  7. ^ a b c Cite error: The named reference rv was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference edr3 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Thomas2021 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference monnier was invoked but never defined (see the help page).
  11. ^ a b c d e Cite error: The named reference williams was invoked but never defined (see the help page).