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HD 210702 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 210702</td></tr><tr> <td colspan="2">Constellation</td> <td>Pegasus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>22h 11m 51.33s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+16° 02′ 26.0″[1]</td></tr><tr><td colspan="2">Distance</td><td>179 ± 4[1] ly
(55 ± 1[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K1IV</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.17 AU
(175 Gm)</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.992 AU
(~148 Gm)</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>~1.35 AU
(~202 Gm)</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.152 ± 0.08</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>341.1 d
(0.9339 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>37.44 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>301 ± 30°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2453118 ± 40 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>59 ± 18 m/s</td></tr>

Physical characteristics

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

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>April 10, 2007</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Johnson et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy</td></tr><tr> <td colspan="2">Discovery site</td> <td>Lick and Keck Observatory
Template:Country data USA</td></tr><tr> <td colspan="2">Discovery status</td> <td>Confirmed[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 210702 b is an exoplanet located approximately 182 light-years away in the constellation of Pegasus, orbiting the star HD 210702. This planet, together with HD 175541 b and HD 192699 b, are planets around intermediate mass stars that were announced in April 2007 by Johnson et al. It has at least twice the mass of Jupiter and it orbits with semimajor axis of 1.17 AU, corresponding to a period of 341.1 days.[3]

Planets around intermediate mass subgiants provide clues for the history of formation and migration of planets around A-type stars.

See also Edit

ReferencesEdit

  1. 1.0 1.1 1.2 1.3 (2007). Validation of the new Hipparcos reduction. Astronomy and Astrophysics 474 (2): 653–664. Vizier catalog entry
  2. (2012). Substellar Companions to Seven Evolved Intermediate-Mass Stars. PASJ.
  3. (2007). Retired A Stars and Their Companions: Exoplanets Orbiting Three Intermediate-Mass Subgiants. The Astrophysical Journal 665 (1): 785–793.

External links Edit

Coordinates: Sky map 22h 11m 51.3311s, +16° 02′ 25.983″

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