| Discovery | |
|---|---|
| Discovered by | Naef et al. |
| Discovery site | La Silla Observatory |
| Discovery date | October 19, 2009 |
| Detection method | radial velocity (HARPS) |
| Orbital characteristics | |
| Apastron | 4.78 AU |
| Periastron | 0.12 AU |
| Semi-major axis | 2.45+0.03 −0.04 AU |
| Eccentricity | 0.95+0.03 −0.04 |
| Orbital period (sidereal) | 1,333±4 d 3.65±0.01 yr |
| Inclination | 21°+38° −11° or 162°+7° −27° |
| Longitude of ascending node | 248°+53° −33° or 163°+38° −36° |
| Time of periastron | 2,454,246+9 −10 JD |
| Argument of periastron | 289°+20° −18° |
| Semi-amplitude | 37.3+5.1 −0.9 m/s |
| Star | HD 28254 |
| Physical characteristics | |
| Mass | 3.8+3.0 −2.2 MJ |
| Temperature | 207+13 −40 K |
HD 28254 b (also known as HIP 20606 b) is an exoplanet which orbits the G-type main sequence star HD 28254, located 180 light-years away in the constellation Dorado.
Discovery
The planet was discovered in a survey by HARPS along with 29 other planets in 2009.
Properties
Due to the planet's high mass, it is assumed to be a gas giant like Jupiter. Since HD 28254 b was detected indirectly, properties such as its inclination, radius, and temperature are unknown. HD 28254 takes about 3 years to orbit its host and has one of the most eccentric orbits around a star. In 2023, the inclination and true mass of HD 28254 b were measured via astrometry, though the mass remains uncertain - it is between about 1.6 and 6.8 times the mass of Jupiter.
References
- ^ Naef, Dominique; Mayor, Michel; Lo Curto, Gaspare; Bouchy, François; Lovis, Christophe; Moutou, Claire; Benz, Willy; Pepe, Francesco; Queloz, Didier; Santos, Nuno C.; Ségransan, Damien; Udry, Stéphane; Bonfils, Xavier; Delfosse, Xavier; Forveille, Thierry; Hébrard, Guillaume; Mordasini, Christoph; Perrier, Christian; Boisse, Isabelle; Sosnowska, Danuta (2010). "The HARPS Search for Southern Extrasolar Planets XXIII. 8 Planetary Companions to Low-activity Solar-type Stars". Astronomy and Astrophysics. 523: A15. arXiv:1008.4600. Bibcode:2010A&A...523A..15N. doi:10.1051/0004-6361/200913616. S2CID 118845989.
- ^ Philipot, F.; Lagrange, A.-M.; et al. (October 2023). "A multi-technique approach to identifying and/or constraining radial-velocity substellar companions". Astronomy & Astrophysics. 678: A107. arXiv:2308.05417. Bibcode:2023A&A...678A.107P. doi:10.1051/0004-6361/202346612. S2CID 260775968.
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