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HD 118203 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 118203</td></tr><tr> <td colspan="2">Constellation</td> <td>Ursa Major</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>13h 34m 02.5375s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+53° 43′ 42.704″</td></tr><tr><td colspan="2">Distance</td><td>289 ly
(88.6 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K0IV</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.07 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.048 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.092 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.309 ± 0.014</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>6.1335 ± 0.0006 d
(0.016792 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>120 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>155.7 ± 2.4°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2453394.23 ± 0.3 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>217 ± 3 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>2.14 MJ
(>680 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>22 August 2005</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Da Silva et al.[1]</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy
(ELDOIE)</td></tr><tr> <td colspan="2">Discovery site</td> <td>Haute-Provence Observatory,
France</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published[1]</td></tr>

Other designations
HIP 66192 b

<tr style="background-color: #A0B0FF;"><td align=center colspan=3>Database references</td></tr><tr valign=baseline><td colspan=2>Extrasolar Planets
Encyclopaedia
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

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.[1]

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.

ReferencesEdit

External links Edit

Coordinates: Sky map 13h 34m 02.5375s, +53° 43′ 42.704″


ru:HD 118203#Планета

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