HAT-P-8

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HAT-P-8
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pegasus
Right ascension 22h 52m 09.865s[1]
Declination +35° 26′ 49.63″[1]
Apparent magnitude (V) 10.17[2]
Characteristics
Spectral type F[3]
Apparent magnitude (B) 10.77 ± 0.04[2]
Apparent magnitude (V) 10.36 ± 0.03[2]
Apparent magnitude (J) 9.214 ± 0.022[2]
Apparent magnitude (H) 9.004 ± 0.018[2]
Apparent magnitude (K) 8.953 ± 0.013[2]
Astrometry
Proper motion (μ) RA: 75.1 ± 0.8[1] mas/yr
Dec.: 14.8 ± 0.7[1] mas/yr
Distance 750 ± 50 ly
(230 ± 15 pc)
Details
Mass 1.28 ± 0.04[3] M
Radius 1.58+0.08
−0.06
[3] R
Surface gravity (log g) 4.19 ± 0.03[4] cgs
Temperature 6223 ± 67[4] K
Metallicity [Fe/H] -0.04 ± 0.08[4] dex
Rotational velocity (v sin i) 12.6 ± 1.0[4] km/s
Age 3.4 ± 1 Gyr
Other designations
GSC 02757-01152, 2MASS J22520985+3526495, TYC 2757-1152-1, UCAC2 44236767
Database references
SIMBAD data
Extrasolar Planets
Encyclopaedia
data

HAT-P-8 is a magnitude 10 star located 750 light-years away in Pegasus.[2]

Planetary system[edit]

In 2008 the HATNet Project announced the discovery of extrasolar planet HAT-P-8b around this star. This planet is hot jupiter gas giant planet.[3]

The HAT-P-8 planetary system
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 1.52+0.18−0.16 MJ 0.0487 ± 0.00026 3.07632 ± 0.000004 ~0

See also[edit]

References[edit]

  1. ^ a b c d 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
  2. ^ a b c d e f g "SIMBAD query result: NAME HAT-P-8 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-24. 
  3. ^ a b c d Latham, David W. et al. (2009). "Discovery of a Transiting Planet and Eight Eclipsing Binaries in HATNet Field G205". The Astrophysical Journal 704 (2): 1107–1119. arXiv:0812.1161. Bibcode:2009ApJ...704.1107L. doi:10.1088/0004-637X/704/2/1107. 
  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. 

External links[edit]

Coordinates: Sky map 22h 52m 09.862s, +35° 26′ 49.59″