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HD 171028 b
Extrasolar planet List of extrasolar planets
300px
Artist's conception of HD 171028 b, as a jovian planet.
Parent star

<tr> <td colspan="2">Star</td> <td>HD 171028</td></tr><tr> <td colspan="2">Constellation</td> <td>Ophiuchus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>18h 32m 15.4929s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+06° 56′ 44.714″</td></tr><tr><td colspan="2">Distance</td><td>293.5±25.4 ly
(90±7.8 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G0V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.29 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.50 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>2.08 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.61</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>538±2 d
(1.47 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>26.2 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>305±1°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2453648.92±1.89 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>? m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>1.83 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>July 13, 2007</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Santos et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy</td></tr><tr> <td colspan="2">Discovery status</td> <td>Unpublished</td></tr> <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 171028 b is a >1.83 MJ exoplanet orbiting very eccentrically around HD 171028. The period is 1.47 years and semi-major axis of 1.29 AU. The Geneva Extrasolar Planet Search team announced the discovery of planet on July 13, 2007.

References Edit

External links Edit

Coordinates: Sky map 18h 32m 15.4929s, +06° 56′ 44.714″


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