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Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Andromeda[1]
Right ascension  23h 39m 05.8108s[2]
Declination +42° 27′ 57.502″[2]
Apparent magnitude (V) +10.54
Spectral type F
Variable type planetary transit
Proper motion (μ) RA: −20.2±0.6[3] mas/yr
Dec.: 2.6±0.5[3] mas/yr
Parallax (π)3.59 ± 0.35[2] mas
Distance910 ± 90 ly
(280 ± 30 pc)
Absolute magnitude (MV)+4.03
Mass1.29 ± 0.06 M
Radius1.46 ± 0.06 R
Luminosity3.55 L
Surface gravity (log g)4.22 ± 0.03[4] cgs
Temperature6687 ± 71[4] K
Metallicity [Fe/H]–0.11 ± 0.08[4] dex
Rotational velocity (v sin i)8.9 ± 1.2[4] km/s
Other designations
GSC 03239-00992, 2MASS J23390581+4227575, TYC 3239-992-1
Database references
Extrasolar Planets

HAT-P-6 is a star in the constellation Andromeda, located approximately 910 light years or 280 parsecs away from the Earth. It is an F-type star, implying that it is hotter and more massive than our Sun. The apparent magnitude of the star is +10.54, which means that it can only be visible through the telescope. The absolute magnitude of +4.03 is brighter than the Sun's +4.83, meaning that the star itself is brighter than the Sun.[5] A search for a binary companion star using adaptive optics at the MMT Observatory turned out negative.[6]

Planetary system[edit]

The companion planet HAT-P-6b is a transiting planet discovered on October 15, 2007 by the HATNet Project. The planet's true mass is slightly more than Jupiter at only 5.7%, but the radius is 33% greater, making the planet's density of 0.45 g/cm3. Its large size compared to mass comes from the great amount of heat received from the nearby star that expands the planet's atmosphere, categorizing as "hot Jupiter". The orbital period is 3.852985 days and the distance from its star is 0.05235 AU. The inclination of the orbit is 85.51º.[5]

The HAT-P-6 planetary system[5][7]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 1.106+0.039
3.852985±0.000005 <0.044

See also[edit]


  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. ^ a b c 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
  3. ^ a b Zacharias, N.; et al. (2013). "The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". The Astronomical Journal. 145 (2). 44. arXiv:1212.6182. Bibcode:2013AJ....145...44Z. doi:10.1088/0004-6256/145/2/44.Vizier catalog entry
  4. ^ a b c d Torres, Guillermo; et al. (2012). "Improved Spectroscopic Parameters for Transiting Planet Hosts". The Astrophysical Journal. 757 (2). 161. arXiv:1208.1268. Bibcode:2012ApJ...757..161T. doi:10.1088/0004-637X/757/2/161.
  5. ^ a b c Noyes, R. W.; et al. (2008). "HAT-P-6b: A Hot Jupiter Transiting a Bright F Star". The Astrophysical Journal Letters. 673 (1): L79–L82. arXiv:0710.2894. Bibcode:2008ApJ...673L..79N. doi:10.1086/527358.
  6. ^ Adams, E. R.; et al. (2013). "Adaptive Optics Images. II. 12 Kepler Objects of Interest and 15 Confirmed Transiting Planets". The Astronomical Journal. 146 (1). 9. arXiv:1305.6548. Bibcode:2013AJ....146....9A. doi:10.1088/0004-6256/146/1/9.
  7. ^ Bonomo, A. S.; et al. (2017). "The GAPS Programme with HARPS-N at TNG . XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy and Astrophysics. 602. A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882.

External links[edit]

Coordinates: Sky map 23h 39m 05.8061s, +42° 27′ 57.513″