HAT-P-3

HAT-P-3, is a metal-rich K star located about 441 light-years away in the constellation Ursa Major. At a magnitude of about 11.5 it is not visible to the naked eye but is visible in a small to medium-sized amateur telescope. It is believed to be a relatively young star and has a slightly enhanced level of chromospheric activity.[4][9]

HAT-P-3

Observation data Epoch 2000      Equinox 2000
Constellation	Ursa Major[1]
Right ascension	13^h 44^m 22.5939^s[2]
Declination	+48° 01′ 43.2063″[2]
Apparent magnitude (V)	11.577 ± 0.067[3]
Characteristics
Spectral type	K[4]
Apparent magnitude (B)	12.53 ± 0.20[5]
Apparent magnitude (V)	11.577 ± 0.067[3]
Apparent magnitude (I)	10.504 ± 0.079[3]
Apparent magnitude (J)	9.936±0.022[6]
Apparent magnitude (H)	9.542±0.028[6]
Apparent magnitude (K)	9.448±0.025[6]
Astrometry
Radial velocity (Rv)	−23.8±0.1[4] km/s
Proper motion (μ)	RA: −19.746±0.034[2] mas/yr Dec.: −24.008±0.038[2] mas/yr
Parallax (π)	7.4031 ± 0.0262[2] mas
Distance	441 ± 2 ly (135.1 ± 0.5 pc)
Absolute magnitude (MV)	5.87 ± 0.15[7]
Details
Mass	0.917 ± 0.030[7] M☉
Radius	0.799 ± 0.039[7] R☉
Luminosity	0.435 ± 0.053[7] L☉
Surface gravity (log g)	4.58 ± 0.03[8] cgs
Temperature	5224 ± 69[8] K
Metallicity [Fe/H]	0.41 ± 0.08[8] dex
Rotational velocity (v sin i)	1.5 ± 1.0[8] km/s
Age	1.6 ^+2.9 −1.3[7] Myr
Other designations
GSC 03466-00819, 2MASS J13442258+4801432, 1SWASP J134422.58+480143.2, TYC 3466-819-1[5]
Database references
SIMBAD	data

The star HAT-P-3 is named Dombay. The name was selected in the NameExoWorlds campaign by Russia, during the 100th anniversary of the IAU. Dombay is a resort region in the North Caucasus mountains.[10][11]

Planetary system

This star is home to the extrasolar planet HAT-P-3b discovered by the HATNet Project using the transit method.[4]

The HAT-P-3 planetary system[7][12]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.609+0.021 −0.022 MJ	0.03899+0.00062 −0.00065	2.8997360±0.0000020	<0.0100	87.07 ± 0.55°	0.827 ± 0.055 RJ

See also

• List of transiting extrasolar planets

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. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
2. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
3. Droege, Thomas F.; et al. (2006). "TASS Mark IV Photometric Survey of the Northern Sky". The Publications of the Astronomical Society of the Pacific. 118 (850): 1666–1678. arXiv:astro-ph/0610529. Bibcode:2006PASP..118.1666D. doi:10.1086/510197. JSTOR 10.1086/510197.Vizier catalog entry
4. Torres, G.; et al. (2007). "HAT-P-3b: A Heavy-Element-rich Planet Transiting a K Dwarf Star". The Astrophysical Journal Letters. 666 (2): L121–L124. arXiv:0707.4268. Bibcode:2007ApJ...666L.121T. doi:10.1086/521792.
5. "TYC 3466-819-1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2013-10-29.
6. Skrutskie, M. F.; et al. (2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708.Vizier catalog entry
7. Chan, Tucker; et al. (2011). "The Transit Light-curve Project. XIV. Confirmation of Anomalous Radii for the Exoplanets TrES-4b, HAT-P-3b, and WASP-12b". The Astronomical Journal. 141 (6). 179. arXiv:1103.3078. Bibcode:2011AJ....141..179C. doi:10.1088/0004-6256/141/6/179.
8. 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.
9. Todorov, Kamen O.; et al. (2013). "Warm Spitzer Photometry of Three Hot Jupiters: HAT-P-3b, HAT-P-4b and HAT-P-12b". The Astrophysical Journal. 770 (2). 102. arXiv:1305.0833. Bibcode:2013ApJ...770..102T. doi:10.1088/0004-637X/770/2/102.
10. "Approved names". NameExoworlds. Retrieved 2020-01-02.
11. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
12. 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

• "HAT-P-3". Exoplanets. Archived from the original on 2009-11-25. Retrieved 2009-05-18.