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HD 142245
Observation data; Epoch J2000 Equinox J2000
Constellation	Serpens
Right ascension	15h 52m 56.2803s
Declination	+15° 25′ 50.5399″
Apparent magnitude (V)	7.45
Characteristics
Evolutionary stage	subgiant
Spectral type	K0IV+M1
Astrometry
Radial velocity (Rv)	6.92 km/s
Proper motion (μ)	RA: -57.477 mas/yr ; Dec.: -21.764 mas/yr
Parallax (π)	10.2562 ± 0.0411 mas
Distance	318 ± 1 ly ; (97.5 ± 0.4 pc)
Orbit
Primary	HD 142245 A
Companion	HD 142245 BC
Semi-major axis (a)	2.5"; (237 AU)
Details
HD 142245 A
Mass	1.52±0.05 M☉
Radius	4.8±0.1 R☉
Luminosity	11.4 L☉
Surface gravity (log g)	3.21±0.14 cgs
Temperature	4838±36 K
Metallicity	0.20±0.02
Age	2.855±0.514 Gyr
HD 142245 BC
Mass	0.56 M☉
Other designations
	BD+15 2925, Gaia DR2 1193193836691820032, HD 142245, HIP 77783, TYC 1496-1841-1, 2MASS J15525629+1525507
Database references
SIMBAD	data

HD 142245 is a hierarchical triple star system about 318 light-years away.

The primary subgiant star HD 142245 A belongs to the spectral class of K0. Its age is much younger than Sun`s at 2.855±0.514 billion years.^[7] The primary star is slightly enriched by heavy elements, having 160% of solar abundance.^[7]

In 2014, the co-moving binary stellar companion HD 142245 BC was detected. It consists of pair of red dwarf stars with composite spectral class M1, orbiting each other on 4 AU orbit.^[4]

No other stellar companions were found at projected separations from 5.48 to 153.34 AU around HD 142245 A.^[2]

Planetary system

In 2011 one superjovian planet HD 142245 A b on a mildly eccentric orbit around star HD 142245 A was discovered utilizing the radial velocity method.^[8]

The HD 142245 planetary system^[9]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
HD 142245 A b	≥1.9±0.2 $M$ _J	2.77±0.09	1299±48	0.32	—	—

References

^ ^a ^b ^c "HD 142245". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 October 2020.
^ ^a ^b ^c Wittrock, Justin M.; Kane, Stephen R.; Horch, Elliott P.; Howell, Steve B.; Ciardi, David R.; Everett, Mark E. (2017), "Exclusion of Stellar Companions to Exoplanet Host Stars", The Astronomical Journal, 154 (5): 184, arXiv:1709.05315, Bibcode:2017AJ....154..184W, doi:10.3847/1538-3881/aa8d69, S2CID 55789971
^ 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.
^ ^a ^b ^c M. Mugrauer, C. Ginski, "High-contrast imaging search for stellar and substellar companions of exoplanet host stars", 2014
^ Sousa, S. G.; Adibekyan, V.; Delgado-Mena, E.; Santos, N. C.; Andreasen, D. T.; Ferreira, A. C. S.; Tsantaki, M.; Barros, S. C. C.; Demangeon, O.; Israelian, G.; Faria, J. P.; Figueira, P.; Mortier, A.; Brandao, I.; Montalto, M.; Rojas-Ayala, B.; Santerne, A. (2018), "SWEET-Cat updated New homogenous spectroscopic parameters", Astronomy & Astrophysics, A58: 620, arXiv:1810.08108, Bibcode:2018A&A...620A..58S, doi:10.1051/0004-6361/201833350, S2CID 119374557
^ ^a ^b Bonfanti, A.; Ortolani, S.; Piotto, G.; Nascimbeni, V. (2015), "Revising the ages of planet-hosting stars", Astronomy & Astrophysics, 575: A18, arXiv:1411.4302, Bibcode:2015A&A...575A..18B, doi:10.1051/0004-6361/201424951, S2CID 54555839
^ ^a ^b ^c ^d Ghezzi, Luan; Montet, Benjamin T.; Johnson, John Asher (2018), "Retired a Stars Revisited: An Updated Giant Planet Occurrence Rate as a Function of Stellar Metallicity and Mass", The Astrophysical Journal, 860 (2): 109, arXiv:1804.09082, Bibcode:2018ApJ...860..109G, doi:10.3847/1538-4357/aac37c, S2CID 118969017
^ John Asher Johnson; Clanton, Christian; Howard, Andrew W.; Bowler, Brendan P.; Henry, Gregory W.; Marcy, Geoffrey W.; Crepp, Justin R.; Endl, Michael; Cochran, William D.; MacQueen, Phillip J.; Wright, Jason T.; Isaacson, Howard (2011), "Retired a Stars and Their Companions. Vii. 18 New Jovian Planets", The Astrophysical Journal Supplement Series, 197 (2): 26, arXiv:1108.4205, Bibcode:2011ApJS..197...26J, doi:10.1088/0067-0049/197/2/26, S2CID 15088371
^ Planet HD 142245 A b on exoplanet.eu