HAT-P-7

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HAT-P-7
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 28m 59.353s[1]
Declination +47° 58′ 10.24″[1]
Apparent magnitude (V) 10.46[2]
Characteristics
Spectral type F8[2]
Apparent magnitude (B) ~10.90[2]
Apparent magnitude (V) ~10.46[2]
Apparent magnitude (J) 9.555 ± 0.030[2]
Apparent magnitude (H) 9.344 ± 0.029[2]
Apparent magnitude (K) 9.334 ± 0.018[2]
Astrometry
Proper motion (μ) RA: –17.7 ± 0.9[1] mas/yr
Dec.: 9.9 ± 1.0[1] mas/yr
Distance 1044 +163
−130
ly
(320 +50
−40
pc)
Details
Mass 1.47+0.8
−0.5
 M
Radius 1.84+0.23
−0.11
 R
Surface gravity (log g) 4.02 ± 0.01[3] cgs
Temperature 6441 ± 69[3] K
Metallicity [Fe/H] 0.15 ± 0.08[3] dex
Rotational velocity (v sin i) 5.0 ± 1.2[3] km/s
Other designations
GSC 03547-01402, KIC 10666592, KOI 2, 2MASS J19285935+4758102, TYC 3547-1402-1[2]
Database references
SIMBAD data
Extrasolar Planets
Encyclopaedia
data

HAT-P-7 is a yellow white dwarf star located about 1044 light-years away in the constellation Cygnus. The apparent magnitude of this star is 10.5, which means it is not visible to the naked eye but can be seen with a small telescope on a clear dark night.[2]

Planetary system[edit]

This star has one planet. This star system is within the field of view of the now-operational Kepler Mission planet-hunter spacecraft.[4]

The HAT-P-7 planetary system
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 1.776 +0.077
−0.049
 MJ
0.0377 ± 0.0005 2.2047299 ± (4×10-6) 0 1.421 RJ

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 h i "SIMBAD query result: NAME HAT-P-7 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-22. 
  3. ^ 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. 
  4. ^ Pál, A. et al. (2008). "HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in the Kepler Field". The Astrophysical Journal 680 (2): 1450–1456. arXiv:0803.0746. Bibcode:2008ApJ...680.1450P. doi:10.1086/588010. 

External links[edit]

  • "HAT-P-7". Exoplanets. Retrieved 2009-05-03. 

Coordinates: Sky map 19h 28m 59s, +47° 58′ 10″