| Discovery[1] | |
|---|---|
| Discovered by | Naefet al. |
| Discovery site | La Silla Observatory |
| Discovery date | October 19, 2009 |
| radial velocity (HARPS) | |
| Orbital characteristics[2] | |
| Apastron | 4.78 AU |
| Periastron | 0.12 AU |
| 2.45+0.03 −0.04 AU | |
| Eccentricity | 0.95+0.03 −0.04 |
| 1,333±4 d 3.65±0.01 yr | |
| Inclination | 21°+38° −11° or162°+7° −27° |
| 248°+53° −33° or163°+38° −36° | |
| 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 MJ[2] |
| Temperature | 207+13 −40 K[citation needed] |
HD 28254 b (also known asHIP 20606 b) is anexoplanet which orbits theG-typemain sequencestarHD 28254, located 180light-years away in theconstellationDorado.
The planet was discovered in a survey byHARPS along with 29 other planets in 2009.[1]
Due to the planet's high mass, it is assumed to be agas 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, theinclination and true mass of HD 28254 b were measured viaastrometry, though the mass remains uncertain - it is between about 1.6 and 6.8 times the mass of Jupiter.[2]
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