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Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Auriga
Right ascension  06h 30m 32.7943s[1]
Declination +29° 40′ 20.287″[1]
Apparent magnitude (V) +11.69
Spectral type G0
Apparent magnitude (B) 12.14±0.021[2]
Apparent magnitude (V) 11.57 ±0.016[2]
Apparent magnitude (R) ~11.6[2]
Apparent magnitude (J) 10.477 ±0.021[2]
Apparent magnitude (H) 10.228 ±0.022[2]
Apparent magnitude (K) 10.188 ±0.020[2]
Proper motion (μ) RA: 0.432±1.908[1] mas/yr
Dec.: −8.283±1.918[1] mas/yr
Parallax (π)2.58 ± 0.27[1] mas
Distanceapprox. 1,300 ly
(approx. 390 pc)
Mass1.35 ± 0.14 M
Radius1.57 ± 0.07 R
Temperature6300 −100+200 K
Metallicity0.3 −0.15+0.05
Other designations
2MASS J06303279+2940202, UCAC2 42216354[2]
Database references
Extrasolar Planets

WASP-12 is a magnitude 11 yellow dwarf star located approximately 1300 light-years away in the constellation Auriga.[2] WASP-12 has a mass and radius similar to the Sun, its planet WASP-12b has a retrograde orbit around WASP-12. Two red dwarf companions have been detected around WASP-12. Both have spectral types of M3V and are only 38% and 37% as massive as the Sun, respectively.[3]

Planetary system[edit]

In 2008, the extrasolar planet WASP-12b was discovered orbiting WASP-12 by the transit method,[4] its high carbon-to-oxygen ratio indicates that rocky planets that might have formed in the star system; it may be a carbon planet.[5]

The WASP-12 planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 1.41 ±0.1 MJ 0.0229 ±0.0008 1.091423 ± 3e-06 0.049 ±0.015 86.0 ± 3.0[6]° 1.736 ± 0.092[6] RJ

See also[edit]


  1. ^ a b c d e Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.Gaia Data Release 1 catalog entry
  2. ^ a b c d e f g h "SIMBAD query result: WASP-12 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-24.
  3. ^ Bechter, Eric B.; Crepp, Justin R.; Ngo, Henry; Knutson, Heather A.; Batygin, Konstantin; Hinkley, Sasha; Muirhead, Philip S.; Johnson, John Asher; Howard, Andrew W.; Montet, Benjamin T.; Matthews, Christopher T.; Morton, Timothy D. (2014). "WASP-12b AND HAT-P-8b ARE MEMBERS OF TRIPLE STAR SYSTEMS". The Astrophysical Journal. 788: 2. arXiv:1307.6857. Bibcode:2014ApJ...788....2B. doi:10.1088/0004-637X/788/1/2.
  4. ^ Hebb; Collier-Cameron, A.; Loeillet, B.; Pollacco, D.; Hébrard, G.; Street, R. A.; Bouchy, F.; Stempels, H. C.; et al. (2009). "WASP-12b: THE HOTTEST TRANSITING EXTRASOLAR PLANET YET DISCOVERED". The Astrophysical Journal. 693 (2): 1920–1928. arXiv:0812.3240. Bibcode:2009ApJ...693.1920H. doi:10.1088/0004-637X/693/2/1920.
  5. ^ Madhusudhan, Nikku; Harrington, Joseph; Stevenson, Kevin B.; Nymeyer, Sarah; Campo, Christopher J.; Wheatley, Peter J.; Deming, Drake; Blecic, Jasmina; et al. (December 8, 2010). "A high C/O ratio and weak thermal inversion in the atmosphere of exoplanet WASP-12b". Nature. 469 (7328): 64–7. arXiv:1012.1603. Bibcode:2011Natur.469...64M. doi:10.1038/nature09602. PMID 21150901..
  6. ^ a b Staff (2015). "Planet WASP-12 b". exoplanet.eu. Retrieved 4 August 2017.

External links[edit]

Coordinates: Sky map 06h 30m 32.794s, +29° 40′ 20.29″