HD 216770 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 216770</td></tr><tr> <td colspan="2">Constellation</td> <td>Piscis Austrinus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>22h 55m 53.7097s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–26° 39′ 31.547″</td></tr><tr><td colspan="2">Distance</td><td>123.5 ly
(37.89 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K1V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.46 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.29 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.63 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.37 ± 0.06</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>118.45 ± 0.55 d
(0.32429 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>42 km/s</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>281 ± 10°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,452,672 ± 3.5 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>30.9 ± 1.9 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>0.65 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>June 30, 2003</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Mayor et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy</td></tr><tr> <td colspan="2">Discovery site</td> <td>Template:Country data United States California, USA</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

HD 216770 b is an extrasolar planet orbiting the star HD 216770. It has a mass about two thirds that of Jupiter, largest planet in our Solar system. But unlike the gas giants in the Solar system, it orbits in a very eccentric orbit around the star. The mean distance from the star is slightly larger than Mercury's, and it completes one orbit around the star in every 118 days.[1]

See alsoEdit


External linksEdit

Coordinates: Sky map 22h 55m 53.7097s, −26° 39′ 31.547″

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