HAT-P-12

HAT-P-12 is a magnitude 13 Metal-Poor K Dwarf star approximately 468 light years away in the constellation Canes Venatici.[3][2]

HAT-P-12
Observation data
Epoch J2000      Equinox J2000
Constellation Canes Venatici[1]
Right ascension 13h 57m 33.4669s[2]
Declination +43° 29′ 36.6025″[2]
Apparent magnitude (V) 12.84
Characteristics
Spectral type K5[3]
Apparent magnitude (J) 10.794 ±0.023[4]
Apparent magnitude (H) 10.236 ±0.022[4]
Apparent magnitude (K) 10.108 ±0.016[4]
Astrometry
Radial velocity (Rv)−40.4589±0.0023[5] km/s
Proper motion (μ) RA: −134.791±0.030[2] mas/yr
Dec.: −44.294±0.035[2] mas/yr
Parallax (π)6.9763 ± 0.0220[2] mas
Distance468 ± 1 ly
(143.3 ± 0.5 pc)
Absolute magnitude (MV)12.35 ± 0.23
Details
Mass0.73 ± 0.02[3] M☉
Radius0.70 (+0.02
−0.01)[3] R☉
Luminosity0.21 (+0.02
−0.01)[3] L☉
Temperature4650 ± 60[3] K
Metallicity [Fe/H]−0.29 ± 0.05[3] dex
Rotation0.5 ± 0.4 kms−1[3]
Age2.5 ± 2.0[3] Gyr
Other designations
Gaia DR2 1499514786891168640, GSC 03033-00706, 2MASS J13573347+4329367[4]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

Planetary system

In 2009 an exoplanet, HAT-P-12b, was discovered by the HATNet Project orbiting this star. The planet was discovered using the transit method and confirmed by follow up radial velocity measurements.[3] Transit-timing variations suggest the possible presence of additional non-transiting planets in the system.[6]

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 — 0.95+2.85
−0.02 RJ
c[6] (unconfirmed) 0.218 MJ — 8.853 0.15499 73.5° —

See also
  • 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. 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.
  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. S2CID 14540643.
  4. "HAT-P-12". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-12-19.
  5. Mancini, L.; et al. (2018). "The GAPS programme with HARPS-N at TNG. XVI. Measurement of the Rossiter-McLaughlin effect of transiting planetary systems HAT-P-3, HAT-P-12, HAT-P-22, WASP-39, and WASP-60". Astronomy and Astrophysics. 613. Table C.2. arXiv:1802.03859. Bibcode:2018A&A...613A..41M. doi:10.1051/0004-6361/201732234.
  6. Non-Sinusoidal Transit Timing Variations for the Exoplanet HAT-P-12b, 2020, arXiv:2012.08820


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