Astronomy:HD 28254 b
| Discovery[1] | |
|---|---|
| Discovered by | Naef et al. |
| Discovery site | La Silla Observatory |
| Discovery date | October 19, 2009 |
| radial velocity (HARPS) | |
| Orbital characteristics[2] | |
| astron|astron|helion}} | 4.78 AU |
| astron|astron|helion}} | 0.12 AU |
| 2.45+0.03 −0.04 astronomical unit|AU | |
| Eccentricity | 0.95+0.03 −0.04 |
| Orbital period | 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° |
| astron|astron|helion}} | 2,454,246+9 −10 JD |
| 289°+20° −18° | |
| Semi-amplitude | 37.3+5.1 −0.9 m/s[1] |
| Star | HD 28254 |
| Physical characteristics | |
| Mass | 3.8+3.0 −2.2 Jupiter mass[2] |
| Physics | 207+13 −40 K[citation needed] |
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.[1]
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.[2]
References
- ↑ 1.0 1.1 1.2 Naef, Dominique; Mayor, Michel; Lo Curto, Gaspare; Bouchy, François; Lovis, Christophe; Moutou, Claire; Benz, Willy; Pepe, Francesco et al. (2010). "The HARPS Search for Southern Extrasolar Planets XXIII. 8 Planetary Companions to Low-activity Solar-type Stars". Astronomy and Astrophysics 523: A15. doi:10.1051/0004-6361/200913616. Bibcode: 2010A&A...523A..15N. http://www.aanda.org/articles/aa/full_html/2010/15/aa13616-09/aa13616-09.html.
- ↑ 2.0 2.1 2.2 Philipot, F. et al. (October 2023). "A multi-technique approach to identifying and/or constraining radial-velocity substellar companions". Astronomy & Astrophysics 678: A107. doi:10.1051/0004-6361/202346612. Bibcode: 2023A&A...678A.107P.
Coordinates: 
04h 24m 50.7052s, −50° 37′ 19.889″
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