Astronomy:HAT-P-7

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Short description: Star
HAT-P-7
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cygnus
Right ascension  19h 28m 59.3539s[1]
Declination +47° 58′ 10.217″[1]
Apparent magnitude (V) 10.46[2]
Characteristics
Spectral type F6V[3]
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]
Variable type planetary transit[4]
Astrometry
Proper motion (μ) RA: −18.325(14)[1] mas/yr
Dec.: 8.851(14)[1] mas/yr
Parallax (π)2.9991 ± 0.0114[1] mas
Distance1,088 ± 4 ly
(333 ± 1 pc)
Details
Mass1.47+0.8−0.5 M☉
Radius1.84+0.23−0.11 R☉
Surface gravity (log g)4.02 ± 0.01[5] cgs
Temperature6441 ± 69[5] K
Metallicity [Fe/H]0.15 ± 0.08[5] dex
Rotational velocity (v sin i)5.0 ± 1.2[5] km/s
Other designations
BD+47°2846, KOI-2, KIC 10666592, TYC 3547-1402-1, GSC 03547-01402, 2MASS J19285935+4758102[2]
Database references
SIMBADdata

HAT-P-7 is a F-type main sequence star located about 1088 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

This star has only one known planet, HAT-P-7b. This star system was within the initial field of view of the Kepler planet-hunting spacecraft[4] and was given the designation KOI-2 and later Kepler-2.

The HAT-P-7 planetary system[6][7][8]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 1.806±0.036 MJ 0.03813±0.00036 2.20473539167±0.00000001654[9] <0.0040 — 1.64±0.11 RJ

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 "HAT-P-7". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HAT-P-7. 
  3. ↑ Faedi, F. et al. (2013). "Lucky imaging of transiting planet host stars with LuckyCam". Monthly Notices of the Royal Astronomical Society 433 (3): 2097–2106. doi:10.1093/mnras/stt885. Bibcode: 2013MNRAS.433.2097F. 
  4. ↑ 4.0 4.1 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. doi:10.1086/588010. Bibcode: 2008ApJ...680.1450P. 
  5. ↑ 5.0 5.1 5.2 5.3 Torres, Guillermo et al. (2012). "Improved Spectroscopic Parameters for Transiting Planet Hosts". The Astrophysical Journal 757 (2): 161. doi:10.1088/0004-637X/757/2/161. Bibcode: 2012ApJ...757..161T. 
  6. ↑ Morris, Brett M. et al. (2013). "Kepler's Optical Secondary Eclipse of HAT-P-7b and Probable Detection of Planet-induced Stellar Gravity Darkening". The Astrophysical Journal Letters 764 (2): L22. doi:10.1088/2041-8205/764/2/L22. Bibcode: 2013ApJ...764L..22M. 
  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. doi:10.1051/0004-6361/201629882. Bibcode: 2017A&A...602A.107B. 
  8. ↑ Rhodes, Michael D.; Puskullu, Caglar; Budding, Edwin; Banks, Timothy S. (2020). "Exoplanet System Kepler-2 with comparisons to Kepler-1 and 13". Astrophysics and Space Science 365 (4): 77. doi:10.1007/s10509-020-03789-3. Bibcode: 2020Ap&SS.365...77R. 
  9. ↑ Battley, Matthew P et al. (10 March 2021). "Revisiting the Kepler field with TESS: Improved ephemerides using TESS 2 min data". Monthly Notices of the Royal Astronomical Society 503 (3): 4092–4104. doi:10.1093/mnras/stab701. Bibcode: 2021MNRAS.503.4092B. 

External links

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



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