A | B | C | D | E | F | G | H | CH | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
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 |
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]
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
- ^ 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
Text je dostupný za podmienok Creative Commons Attribution/Share-Alike License 3.0 Unported; prípadne za ďalších podmienok. Podrobnejšie informácie nájdete na stránke Podmienky použitia.
Antropológia
Aplikované vedy
Bibliometria
Dejiny vedy
Encyklopédie
Filozofia vedy
Forenzné vedy
Humanitné vedy
Knižničná veda
Kryogenika
Kryptológia
Kulturológia
Literárna veda
Medzidisciplinárne oblasti
Metódy kvantitatívnej analýzy
Metavedy
Metodika
Text je dostupný za podmienok Creative
Commons Attribution/Share-Alike License 3.0 Unported; prípadne za ďalších
podmienok.
Podrobnejšie informácie nájdete na stránke Podmienky
použitia.
www.astronomia.sk | www.biologia.sk | www.botanika.sk | www.dejiny.sk | www.economy.sk | www.elektrotechnika.sk | www.estetika.sk | www.farmakologia.sk | www.filozofia.sk | Fyzika | www.futurologia.sk | www.genetika.sk | www.chemia.sk | www.lingvistika.sk | www.politologia.sk | www.psychologia.sk | www.sexuologia.sk | www.sociologia.sk | www.veda.sk I www.zoologia.sk