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HD 181720 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 181720</td></tr><tr> <td colspan="2">Constellation</td> <td>Sagittarius</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>19h 22m 52.99s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–32° 55′ 08.6″[1]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>7.84[2]</td></tr><tr><td colspan="2">Distance</td><td>190 ± 10[1] ly
(58 ± 4[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G1V[2]</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.78[2] AU
(266 Gm)</td></tr><tr><td> </td> <td style="text-align: center"> </td> <td>30.8 mas</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>1.31 AU
(196 Gm)</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>2.24 AU
(335 Gm)</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.26 ± 0.06[2]</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>956 ± 14[2] d
(2.62 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>20.3 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>177 ± 12[2]°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,453,631 ± 30[2] JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>8.4 ± 0.4[2] m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>0.37[2] MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>October 19, 2009</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Santos et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>radial velocity (HARPS)</td></tr><tr> <td colspan="2">Discovery site</td> <td>La Silla Observatory</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published[2]</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 181720 b is an extrasolar planet which orbits the G-type main sequence star HD 181720, located approximately 190 light years away in the constellation Sagittarius. This planet has at least three-eighths the mass of Jupiter and takes over two and five-eighths years to orbit the star at a semimajor axis of 1.78 AU with an eccentricity of 0.26.[2] This planet was detected by HARPS on October 19, 2009, together with 29 other planets.

See also Edit

References Edit

Coordinates: Sky map 19h 22m 52.9859s, −32° 55′ 08.595″


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