HD 118203 b

HD 118203 b is a jovian planet that takes only 6.13 days or 147 hours to orbit the parent star HD 118203 at a distance of 0.07 astronomical units. The exact mass was not known since inclination was not known until TESS detected the planet. This hot Jupiter is unusual since it has relatively high eccentricity of 0.31.[1][2]

HD 118203 b
Discovery
Discovered byDa Silva et al.[1]
Discovery siteHaute-Provence Observatory,
France
Discovery date22 August 2005
Doppler spectroscopy
(ELDOIE)
Orbital characteristics
Apastron0.092 AU (13,800,000 km)
Periastron0.048 AU (7,200,000 km)
0.07082 AU (10,595,000 km)[2]
Eccentricity0.316±0.021[2]
6.134980+0.000038
−0.000037[2] d
120
Inclination88.75+0.86
−1.0[2]
2458707.116+0.048
−0.045[2]
153.6+3.5
−3.6[2]
Semi-amplitude218.3+5.2
−5.1[2]
StarHD 118203
Physical characteristics
Mean radius
1.133+0.031
−0.030[2] RJ
Mass2.173+0.077
−0.080[2] MJ
Mean density
1.85 ± 0.13[2] g/cm3 g cm−3
Temperature1,496 ± 26 K (1,222.8 ± 26.0 °C; 2,233.1 ± 46.8 °F) (equilibrium)[2]

    The planet HD 118203 b is named Staburags. The name was selected in the NameExoWorlds campaign by Latvia, during the 100th anniversary of the IAU. Staburags is the name of a character from the Latvian poem Staburags un Liesma, and denotes a rock with symbolic meaning in literature and history.[3][4]

    HD 118203 b was discovered in August 2005 in Haute-Provence Observatory in France by Da Silva who used the doppler spectroscopy to look for shifts in the star's spectrum caused by the planet's gravity as the planet orbits the star.

    In 2019 the transits of the planet were detected with the Transiting Exoplanet Survey Satellite. The host star is one of the brightest stars for transiting planets and HD 118203 b is therefore a good target for follow-up observations.[2]

    References
    1. da Silva, R.; et al. (2006). "Elodie metallicity-biased search for transiting Hot Jupiters I. Two Hot Jupiters orbiting the slightly evolved stars HD118203 and HD149143". Astronomy and Astrophysics. 446 (2): 717–722. arXiv:astro-ph/0510048. Bibcode:2006A&A...446..717D. doi:10.1051/0004-6361:20054116.
    2. Pepper, Joshua; Kane, Stephen R.; Rodriguez, Joseph E.; Hinkel, Natalie R.; Eastman, Jason D.; Daylan, Tansu; Mocnik, Teo; Dalba, Paul A.; Fetherolf, Tara; Stassun, Keivan G.; Campante, Tiago L. (2019-11-12). "TESS Reveals HD 118203 b to be a Transiting Planet". arXiv:1911.05150 [astro-ph.EP].
    3. "Approved names". NameExoworlds. Retrieved 2020-01-02.
    4. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.


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