HD 118203

HD 118203

Starbox short
name = HD 118203
epoch = J2000.0
constell = Ursa Major
ra = 13h 34m 02.538s
dec = +53º 43' 42.70″
spectral = K0
appmag_v = 8.05
absmag_v = 3.31
dist_ly = 289
dist_pc = 88.6
names = BD+54 1609, HIP 66192, SAO 28802

HD 118203 is an orange star located in Ursa Major constellation 289 light years away from Earth. It has higher metallicity by 25% and very similar stellar age of 4.6 billion years. It has mass 23% greater than the Sun. It is invisible to the naked eye but it can be visible using binoculars or a telescope. If this star is located 10 parsecs or 33 light years away, it would be easily visible to the unaided eye.

HD 118203 b

Planetbox begin
name = HD 118203 b Planetbox orbit
semimajor = 0.07
eccentricity = 0.309±0.014
period = 6.1335±0.0006
ang_dist = 0.79
long_peri = 155.7±2.4
t_peri = 2453394.23±0.3
semi-amp = 217±3Planetbox character
mass = >2.14 Planetbox discovery
discovery_date = 2005
discoverers = Da Silva et al.
discovery_site = France
discovery_method = Doppler spectroscopy
discovery_status=Published HD 118203 b is a jovian planet that takes only 6.13 days or 147 hours to orbit the parent star at a distance of 0.07 astronomical units. It has minimum mass of 2.14 times that of Jupiter but the true mass is not known since inclination is not known. This hot Jupiter is unusual since it has relatively high eccentricity of 0.31.

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

References

*cite journal |url=http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2006/05/aa4116-05/aa4116-05.html |author=R. Da Silva, S. Udry, F. Bouchy, M. Mayor, C. Moutou, F. Pont, D. Queloz, N. C. Santos3, , D. Ségransan and S. Zucker
title=Elodie metallicity-biased search for transiting Hot JupitersI. Two Hot Jupiters orbiting the slightly evolved stars HD 118203 and HD 149143
journal=A&A |year=2005 |volume=446 |pages=717–722 |accessdate=2007-12-07

External links

*cite web |url=http://exoplanet.eu/star.php?st=HD+118203 |title=Notes for star HD 118203 |work=The Extrasolar Planets Encyclopaedia |accessdate=December 7 |accessyear=2007
*cite web |url=http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=HD+118203&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id |title=HD 118203 -- Star |work=SIMBAD |accessdate=December 7 |accessyear=2007
*cite web |url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD%20118203b |title=HD 118203b – Extra-solar Planet Candidate |work=SIMBAD |accessdate=December 7 |accessyear=2007


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