HD 142245

HD 142245
Observation data; Epoch J2000 Equinox ICRS
Constellation	Serpens
Right ascension	15h 52m 56.28008s
Declination	+15° 25′ 50.5379″
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: −57.312 mas/yr ; Dec.: −21.641 mas/yr
Parallax (π)	10.2374±0.0224 mas
Distance	318.6 ± 0.7 ly ; (97.7 ± 0.2 pc)
Absolute magnitude (MV)	+2.27
Orbit
Primary	HD 142245 A
Secondary	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	4,838±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, HD 142245, HIP 77783, TYC 1496-1841-1, 2MASS J15525629+1525507, Gaia DR2 1193193836691820032
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. The primary star is slightly enriched by heavy elements, having 160% of solar abundance.

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.

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

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.

The HD 142245 planetary system
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

1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H.
↑ Bonsor, Amy; Kennedy, Grant M.; Wyatt, Mark C.; Johnson, John A.; Sibthorpe, Bruce (2014). "Herschel observations of debris discs orbiting planet-hosting subgiants". Monthly Notices of the Royal Astronomical Society. 437 (4): 3288. arXiv:1311.2947. Bibcode:2014MNRAS.437.3288B. doi:10.1093/mnras/stt2128.
1 2 3 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.
1 2 3 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.
1 2 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.
1 2 3 4 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.
↑ "HD 142245". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 October 2020.
↑ 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

[xhip-1] 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.

[dr3-2] 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[tycho2-3] Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H.

[subgiant-4] Bonsor, Amy; Kennedy, Grant M.; Wyatt, Mark C.; Johnson, John A.; Sibthorpe, Bruce (2014). "Herschel observations of debris discs orbiting planet-hosting subgiants". Monthly Notices of the Royal Astronomical Society. 437 (4): 3288. arXiv:1311.2947. Bibcode:2014MNRAS.437.3288B. doi:10.1093/mnras/stt2128.

[Wittrock2017-5] 1 2 3 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.

[Mugrauer2014-6] 1 2 3 M. Mugrauer, C. Ginski, "High-contrast imaging search for stellar and substellar companions of exoplanet host stars", 2014

[Souse2018-7] 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.

[Bonfanti2014-8] 1 2 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.

[Ghezzi2018-9] 1 2 3 4 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.

[SIMBAD-10] "HD 142245". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 October 2020.

[Johnson2011-11] 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.

[12] Planet HD 142245 A b on exoplanet.eu