HD 118203
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Ursa Major |
| Right ascension | 13h 34m 02.538s |
| Declination | +53º 43' 42.70″ |
| Apparent magnitude (V) | 8.05 |
| Absolute magnitude (V) | 3.31 |
| Distance | 289 ly (88.6 pc) |
| Spectral type | K0 |
| Other designations | |
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.
[edit] HD 118203 b
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 0.07 AU |
| Eccentricity | (e) | 0.309±0.014 |
| Orbital period | (P) | 6.1335±0.0006 d |
| Angular distance | (θ) | 0.79 mas |
| Longitude of periastron |
(ω) | 155.7±2.4° |
| Time of periastron | (T0) | 2453394.23±0.3 JD |
| Semi-amplitude | (K) | 217±3 m/s |
| Physical characteristics | ||
| Mass | (m) | >2.14 MJ |
| Discovery information | ||
| Discovery date | 2005 | |
| Discoverer(s) | Da Silva et al. | |
| Detection method | Doppler spectroscopy | |
| Discovery site | France | |
| 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.
[edit] References
- R. Da Silva, S. Udry, F. Bouchy, M. Mayor, C. Moutou, F. Pont, D. Queloz, N. C. Santos3, , D. Ségransan and S. Zucker (2005). "[http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2006/05/aa4116-05/aa4116-05.html Elodie metallicity-biased search for transiting Hot Jupiters
I. Two Hot Jupiters orbiting the slightly evolved stars HD 118203 and HD 149143]" 446: 717-722.
[edit] External links
- Notes for star HD 118203. The Extrasolar Planets Encyclopaedia. Retrieved on December 7, 2007.
- Notes for planet HD 118203 b. The Extrasolar Planets Encyclopaedia. Retrieved on December 7, 2007.
- HD 118203 -- Star. SIMBAD. Retrieved on December 7, 2007.
- HD 118203b – Extra-solar Planet Candidate. SIMBAD. Retrieved on December 7, 2007.
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