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HD 171238 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 171238</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>18h 34m 43.6733s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–28° 04′ 20.328″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>8.66</td></tr><tr><td colspan="2">Distance</td><td>163.99 ± 9.49 ly
(50.28 ± 2.91 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G8V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>2.54 ± 0.06 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>1.52 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>3.56 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.4+0.061
−0.065
</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>1523+40
−45
d
(4.17+0.11
−0.12
y)</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>47+9.9
−9.8
°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>5062 ± 20 JD</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>2.6 ± 0.15 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>August 11, 2009</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Segransan et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Radial velocity (CORALIE)</td></tr><tr> <td colspan="2">Discovery site</td> <td>La Silla Observatory</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

Other designations
HIP 91085 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 171238 b is an extrasolar planet which orbits the G-type main sequence star HD 171238, located approximately 164 light years away in the constellation Sagittarius. This planet has minimum mass two and a half times greater than Jupiter and orbits two times closer to the star than Jupiter to the Sun. However this planet orbits in an eccentric orbit, about two astronomical units difference between periastron and apastron distances. This planet was discovered in August 2009 by using the radial velocity method in La Silla Observatory, Chile.

References Edit

  • Segransan et al. (2009). The CORALIE survey for southern extrasolar planets. XVI. Discovery of a planetary system around HD 147018 and of two long period and massive planets orbiting HD 171238 and HD 204313. Astronomy & Astrophysics 511: A45.

Coordinates: Sky map 18h 34m 43.6733s, −28° 04′ 20.328″


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