HAT-P-12

HAT-P-12

Observation data Epoch J2000      Equinox J2000
Constellation	Canes Venatici[1]
Right ascension	13^h 57^m 33.47^s[2]
Declination	+43° 29′ 36.8″[2]
Apparent magnitude (V)	12.84
Characteristics
Spectral type	K5[3]
Apparent magnitude (J)	10.794 ±0.023[2]
Apparent magnitude (H)	10.236 ±0.022[2]
Apparent magnitude (K)	10.108 ±0.016[2]
Astrometry
Proper motion (μ)	RA: -132 ± 2[2] mas/yr Dec.: -38 ± 1[2] mas/yr
Distance	464.77 (+13.7 −10.8) ly (142.5 (+4.2 −3.3) pc)
Absolute magnitude (MV)	12.35 ± 0.23
Details
Mass	0.73 ± 0.02[3] M☉
Radius	0.70 (+0.02 −0.01)[3] R☉
Luminosity	0.21 (+0.02 −0.01)[3] L☉
Temperature	4650 ± 60[3] K
Metallicity [Fe/H]	−0.29 ± 0.05[3] dex
Rotation	0.5 ± 0.4 kms^−1[3]
Age	2.5 ± 2.0[3] Gyr
Other designations
SDSS J135733.42+432936.5, GSC 03033-00706, 2MASS J13573347+4329367
Database references
SIMBAD	data
Exoplanet Archive	data
Extrasolar Planets Encyclopaedia	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)

HAT-P-12 is a magnitude 13 star approximately 465 light years away in the constellation Canes Venatici.^[2]

Planetary system

An exoplanet, HAT-P-12b, was discovered orbiting the star by the transit method in 2009.^[3]

The HAT-P-12 planetary system^[3]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.211 ± 0.012 MJ	0.0384 ± 0.0003	3.2130598 ± 0.000006	0	—	—

See also

• HATNet Project or HAT
• List of extrasolar planets

References

1. Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034.Vizier query form
2. "SIMBAD query result: NAME HAT-P-12 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-05-18.
3. Hartman, J. D.; et al. (2009). "HAT-P-12b: A Low-density sub-Saturn mass planet transiting a metal-poor K dwarf". The Astrophysical Journal. 706 (1): 785–796. arXiv:0904.4704. Bibcode:2009ApJ...706..785H. doi:10.1088/0004-637X/706/1/785.

External links

• "HAT-P-12". Exoplanets. Retrieved 2009-05-18.

Coordinates: 13^h 57^m 33^s, +43° 29′ 37″