HD 28254 b

HD 28254 b
Discovery
Discovered by	Naef et al.
Discovery site	La Silla Observatory
Discovery date	October 19, 2009
Detection method	radial velocity (HARPS)
Orbital characteristics
Semi-major axis	2.15 AU (322,000,000 km)
Eccentricity	0.81+0.05; −0.02
Orbital period (sidereal)	1,116±26 d
Time of periastron	2,454,049+43; −55 JD
Argument of periastron	301°+3°; −4°
Semi-amplitude	37.3+5.1; −0.9 m/s
Star	HD 28254
Physical characteristics
Mean radius	1.21 RJ
Mass	1.16+0.10; −0.06 MJ
Surface gravity	34.93 m/s2
Temperature	207+13; −40 K

HD 28254 b (also known as HIP 20606 b) is an extrasolar planet which orbits the G-type main sequence star HD 28254, located approximately 178 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 planets high mass, it's assumed to be a gas giant like Jupiter. Since HD 28254 was detected indirectly, properties such as its inclination, radius, and temperature are unknown. HD 28254 takes about 3 years to orbit its host. However, the planet has one of the most eccentric orbits around a star.

References[]

^ ^a ^b ^c ^d 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.

Coordinates: 04^h 24^m 50.7052^s, −50° 37′ 19.889″

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[Naef2010-1] 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.

[1]

Discovery^[1]
Discovered by	Naef et al.
Discovery site	La Silla Observatory
Discovery date	October 19, 2009
Detection method	radial velocity (HARPS)
Orbital characteristics^[1]
Semi-major axis	2.15 AU (322,000,000 km)
Eccentricity	0.81+0.05 −0.02
Orbital period (sidereal)	1,116±26 d
Time of periastron	2,454,049+43 −55 JD
Argument of periastron	301°+3° −4°
Semi-amplitude	37.3+5.1 −0.9 m/s
Star	HD 28254
Physical characteristics
Mean radius	1.21 R_J
Mass	1.16+0.10 −0.06 M_J^[1]
Surface gravity	34.93 m/s²
Temperature	207+13 −40 K