Astronomy:HAT-P-6

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Short description: Star in the constellation Andromeda
HAT-P-6 / Sterrennacht
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda[1]
Right ascension  23h 39m 05.8103s[2]
Declination +42° 27′ 57.505″[2]
Apparent magnitude (V) +10.47[3]
Characteristics
Spectral type F8V[4]
B−V color index 0.41[3]
Variable type planetary transit[5]
Astrometry
Radial velocity (Rv)−22.13(44)[6] km/s
Proper motion (μ) RA: −20.202(18)[2] mas/yr
Dec.: 2.996(18)[2] mas/yr
Parallax (π)3.6459 ± 0.0221[2] mas
Distance895 ± 5 ly
(274 ± 2 pc)
Absolute magnitude (MV)+3.36(16)[5]
Details
Mass1.29 ± 0.06[7] M☉
Radius1.46 ± 0.06[7] R☉
Luminosity3.57+0.52
−0.43[5] L☉
Surface gravity (log g)4.22 ± 0.03[8] cgs
Temperature6,570 ± 80[7] K
Metallicity [Fe/H]–0.13 ± 0.08[7] dex
Rotational velocity (v sin i)8.7 ± 1.0[7] km/s
Age2.3+0.5−0.7[7] Gyr
Other designations
Sterrennacht, TYC 3239-992-1, GSC 03239-00992, 2MASS J23390581+4227575[9]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

HAT-P-6 also named Sterrennacht[10] is a star in the constellation Andromeda, located approximately 895 light years or 274 parsecs away from the Earth. It is an F-type star, implying that it is hotter and more massive than the 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 +3.36 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.[11]

The name Sterrennacht (Starry Night) was selected in the NameExoWorlds held by the IAU after a painting by Van Gogh.[10]

Planetary system

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.[5] The inclination of the orbit with respect to the stellar rotation axis is roughly 166º.[12]

The HAT-P-6 planetary system[5][7]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b / Nachtwacht 1.106+0.039
−0.040 MJ 		0.05239+0.00080
−0.00082 		3.852985±0.000005 <0.044 166±10[12]° 1.330±0.061 RJ

See also

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. doi:10.1086/132034. Bibcode: 1987PASP...99..695R. Vizier query form
  2. ↑ 2.0 2.1 2.2 2.3 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.
  3. ↑ 3.0 3.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy & Astrophysics 355: L27–L30, Bibcode: 2000A&A...355L..27H. 
  4. ↑ Faedi, F.; Staley, T.; Gómez Maqueo Chew, Y.; Pollacco, D.; Dhital, S.; Barros, S. C. C.; Skillen, I.; Hebb, L. et al. (2013). "Lucky imaging of transiting planet host stars with LuckyCam". Monthly Notices of the Royal Astronomical Society 433 (3): 2097. doi:10.1093/mnras/stt885. Bibcode: 2013MNRAS.433.2097F. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 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. doi:10.1086/527358. Bibcode: 2008ApJ...673L..79N. 
  6. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 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. ↑ 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. 
  9. ↑ "HAT-P-6". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HAT-P-6. 
  10. ↑ 10.0 10.1 "Approved names" (in en). http://www.nameexoworlds.iau.org/final-results. 
  11. ↑ 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. doi:10.1088/0004-6256/146/1/9. Bibcode: 2013AJ....146....9A. 
  12. ↑ 12.0 12.1 Hébrard, Guillaume; Ehrenreich, David; Bouchy, François; Delfosse, Xavier; Moutou, Claire; Arnold, Luc; Boisse, Isabelle; Bonfils, Xavier et al. (2011). "The retrograde orbit of the HAT-P-6b exoplanet". Astronomy and Astrophysics 527: L11. doi:10.1051/0004-6361/201016331. Bibcode: 2011A&A...527L..11H. 

External links

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



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