WASP-12
Star in the constellation Auriga From Wikipedia, the free encyclopedia
WASP-12 is a magnitude 11 yellow dwarf star located approximately 1347 light-years away[2] in the constellation Auriga.[4] WASP-12 has a mass and radius similar to the Sun and is known for being orbited by a planet that is extremely hot and has a retrograde orbit around WASP-12. WASP-12 forms a triple star system with two red dwarf companions. Both of them have spectral types of M3V and are only 38% and 37% as massive as the Sun, respectively.[7]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 06h 30m 32.7966s[2] |
| Declination | +29° 40′ 20.264″[2] |
| Apparent magnitude (V) | 11.560±0.068[3] |
| Characteristics | |
| Spectral type | G0V or F[citation needed] |
| Apparent magnitude (B) | 12.138±0.019[3] |
| Apparent magnitude (R) | ~11.6[4] |
| Apparent magnitude (J) | 10.477±0.021[5] |
| Apparent magnitude (H) | 10.228±0.022[5] |
| Apparent magnitude (K) | 10.188±0.020[5] |
| Astrometry | |
| Proper motion (μ) | RA: −1.519(19) mas/yr[2] Dec.: −6.761(15) mas/yr[2] |
| Parallax (π) | 2.4213±0.0166 mas[2] |
| Distance | 1,347 ± 9 ly (413 ± 3 pc) |
| Details | |
| Mass | 1.434+0.11 −0.09[6] M☉ |
| Radius | 1.657+0.046 −0.044[6] R☉ |
| Luminosity | 4.05+0.54 −0.53[6] L☉ |
| Temperature | 6360+130 −140[6] K |
| Metallicity | +0.33+0.14 −0.17[6] |
| Other designations | |
| TYC 1891-1178-1, 2MASS J06303279+2940202, UCAC2 42216354, Gaia DR2 3435282862461427072[4] | |
| Database references | |
| SIMBAD | data |
Planetary system
In 2008, the extrasolar planet WASP-12b was discovered orbiting WASP-12 by the transit method.[8] Its high carbon-to-oxygen ratio indicates that rocky planets might have formed in the star system, and it may be a carbon planet.[9] It is subject to intensive photo-evaporation, and may be completely destroyed within one billion years from now.[10]
In 2015, no indications of additional planets were found in the WASP-12 system.[6]
- Artist's conception of WASP-12 & WASP-12b
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| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.41±0.1 MJ | 0.0229±0.0008 | 1.091423±0.000003 | 0.049±0.015 | 86.0±3.0[11]° | 1.736±0.092[11] RJ |
See also
References
External links
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