HD 142245 is a hierarchical triple star system about 318 light-years away.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 52m 56.2803s[1] |
| Declination | +15° 25′ 50.5399″[1] |
| Apparent magnitude (V) | 7.45 |
| Characteristics | |
| Evolutionary stage | subgiant |
| Spectral type | K0IV+M1[2] |
| 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[3] |
| 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[4]) |
| Details[5] | |
| HD 142245 A | |
| Mass | 1.52±0.05[2] M☉ |
| Radius | 4.8±0.1[6] R☉ |
| Luminosity | 11.4[6] L☉ |
| Surface gravity (log g) | 3.21±0.14 cgs |
| Temperature | 4838±36[7] K |
| Metallicity | 0.20±0.02[7] |
| Age | 2.855±0.514 Gyr |
| HD 142245 BC | |
| Mass | 0.56[4] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
editIn 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]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| HD 142245 A b | ≥1.9±0.2 MJ | 2.77±0.09 | 1299±48 | 0.32 | — | — |
References
edit- ^ 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