Astronomy:HD 28254 b

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Short description: Extrasolar planet in the constellation Dorado
HD 28254 b
Discovery[1]
Discovered byNaef et al.
Discovery siteLa Silla Observatory
Discovery dateOctober 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
Eccentricity0.95+0.03
−0.04
Orbital period1,333±d
3.65±0.01 yr
Inclination21°+38°
−11°
or 162°+7°
−27°
Longitude of ascending node248°+53°
−33°
or 163°+38°
−36°
astron|astron|helion}}2,454,246+9
−10
 JD
289°+20°
−18°
Semi-amplitude37.3+5.1
−0.9
 m/s
[1]
StarHD 28254
Physical characteristics
Mass3.8+3.0
−2.2
 Jupiter mass
[2]
Physics207+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. 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. Bibcode2010A&A...523A..15N. http://www.aanda.org/articles/aa/full_html/2010/15/aa13616-09/aa13616-09.html. 
  2. 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. Bibcode2023A&A...678A.107P. 

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