WR 142 information

WR 142
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Cygnus
Right ascension	20h 21m 44.3s
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.

^ ^a ^b ^c ^d ^e Zacharias, N.; et al. (2003). "The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2)". CDS/ADC Collection of Electronic Catalogues. 1289: 0. Bibcode:2003yCat.1289....0Z.
^ ^a ^b Sander, A.; Hamann, W. -R.; Todt, H. (2012). "The Galactic WC stars". Astronomy & Astrophysics. 540: A144. arXiv:1201.6354. Bibcode:2012A&A...540A.144S. doi:10.1051/0004-6361/201117830. S2CID 119182468.
^ ^a ^b Tramper, F.; Straal, S. M.; Sanyal, D.; Sana, H.; de Koter, A.; Gräfener, G.; Langer, N.; Vink, J. S.; de Mink, S. E.; Kaper, L. (2015). "Massive stars on the verge of exploding: The properties of oxygen sequence Wolf-Rayet stars". Astronomy & Astrophysics. 581 (110): A110. arXiv:1507.00839v1. Bibcode:2015A&A...581A.110T. doi:10.1051/0004-6361/201425390. S2CID 56093231.
^ Turner, D. G.; Forbes, D. (1982). "Berkeley 87, a heavily-obscured young cluster associated with the ON2 star-formation complex and containing the WO star Stephenson 3". Publications of the Astronomical Society of the Pacific. 94: 789. Bibcode:1982PASP...94..789T. doi:10.1086/131065. ISSN 0004-6280.
^ Van Der Hucht, Karel A.; Conti, Peter S.; Lundström, Ingemar; Stenholm, Björn (1981). "The Sixth Catalogue of galactic Wolf-Rayet stars, their past and present". Space Science Reviews. 28 (3): 227–306. Bibcode:1981SSRv...28..227V. doi:10.1007/BF00173260. ISSN 0038-6308. S2CID 121477300.
^ ^a ^b ^c Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ Crowther, Paul A.; Rate, Gemma (2020). "Unlocking Galactic Wolf–Rayet stars with Gaia DR2 – I. Distances and absolute magnitudes". Monthly Notices of the Royal Astronomical Society. 493 (1): 1512–1529. arXiv:1912.10125. Bibcode:2020MNRAS.493.1512R. doi:10.1093/mnras/stz3614. S2CID 209444955.
^ ^a ^b ^c ^d ^e Sander, A. A. C.; Hamann, W.-R.; Todt, H.; Hainich, R.; Shenar, T.; Ramachandran, V.; Oskinova, L. M. (2019). "The Galactic WC and WO stars". Astronomy & Astrophysics. 621: A92. arXiv:1807.04293. Bibcode:2019A&A...621A..92S. doi:10.1051/0004-6361/201833712. S2CID 67754788.

[ucac-1] Zacharias, N.; et al. (2003). "The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2)". CDS/ADC Collection of Electronic Catalogues. 1289: 0. Bibcode:2003yCat.1289....0Z.

[wc-2] Sander, A.; Hamann, W. -R.; Todt, H. (2012). "The Galactic WC stars". Astronomy & Astrophysics. 540: A144. arXiv:1201.6354. Bibcode:2012A&A...540A.144S. doi:10.1051/0004-6361/201117830. S2CID 119182468.

[wo-3] Tramper, F.; Straal, S. M.; Sanyal, D.; Sana, H.; de Koter, A.; Gräfener, G.; Langer, N.; Vink, J. S.; de Mink, S. E.; Kaper, L. (2015). "Massive stars on the verge of exploding: The properties of oxygen sequence Wolf-Rayet stars". Astronomy & Astrophysics. 581 (110): A110. arXiv:1507.00839v1. Bibcode:2015A&A...581A.110T. doi:10.1051/0004-6361/201425390. S2CID 56093231.

[turner-4] Turner, D. G.; Forbes, D. (1982). "Berkeley 87, a heavily-obscured young cluster associated with the ON2 star-formation complex and containing the WO star Stephenson 3". Publications of the Astronomical Society of the Pacific. 94: 789. Bibcode:1982PASP...94..789T. doi:10.1086/131065. ISSN 0004-6280.

[wr-5] Van Der Hucht, Karel A.; Conti, Peter S.; Lundström, Ingemar; Stenholm, Björn (1981). "The Sixth Catalogue of galactic Wolf-Rayet stars, their past and present". Space Science Reviews. 28 (3): 227–306. Bibcode:1981SSRv...28..227V. doi:10.1007/BF00173260. ISSN 0038-6308. S2CID 121477300.

[dr2-6] Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[gemma-7] Crowther, Paul A.; Rate, Gemma (2020). "Unlocking Galactic Wolf–Rayet stars with Gaia DR2 – I. Distances and absolute magnitudes". Monthly Notices of the Royal Astronomical Society. 493 (1): 1512–1529. arXiv:1912.10125. Bibcode:2020MNRAS.493.1512R. doi:10.1093/mnras/stz3614. S2CID 209444955.

[sander2019-8] Sander, A. A. C.; Hamann, W.-R.; Todt, H.; Hainich, R.; Shenar, T.; Ramachandran, V.; Oskinova, L. M. (2019). "The Galactic WC and WO stars". Astronomy & Astrophysics. 621: A92. arXiv:1807.04293. Bibcode:2019A&A...621A..92S. doi:10.1051/0004-6361/201833712. S2CID 67754788.

Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Cygnus
Right ascension	20^h 21^m 44.3^s^[1]
Declination	+37° 22′ 30.56″^[1]
Apparent magnitude (V)	12.94^[2]
Characteristics
Spectral type	WO2^[3]
Apparent magnitude (J)	9.538^[1]
Apparent magnitude (H)	8.889^[1]
Apparent magnitude (K)	8.596^[1]
U−B color index	−0.29^[4]
B−V color index	+1.43^[5]
Astrometry

Proper motion (μ)	RA: −6.270^[6] mas/yr Dec.: −3.422^[6] mas/yr
Parallax (π)	0.5755 ± 0.0284 mas^[6]
Distance	1,650+110 −90^[7] pc
Absolute magnitude (M_V)	−3.13^[8]

Details

Mass	28.6^[8] `M`_☉
Radius	0.80^[8] `R`_☉
Luminosity (bolometric)	912,000^[8] `L`_☉
Temperature	200,000^[8] K
Metallicity [Fe/H]	0.0^[3] dex
Rotational velocity (v sin i)	1,000^[2] km/s

Other designations
WR 142, 2MASS J20214434+3722306, GSC 02684-00001, Sand 5, St 3, UCAC2 44891902
Database references
SIMBAD	data

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