Discovery [1] | |
---|---|
Discovered by | Naef et 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° or 162°+7° −27° |
248°+53° −33° or 163°+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 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.
The planet was discovered in a survey by HARPS along with 29 other planets in 2009. [1]
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]