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HD 11964 c
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 11964</td></tr><tr> <td colspan="2">Constellation</td> <td>Cetus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>01h 57m 09.6064s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>−10° 14′ 32.739″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>6.415</td></tr><tr><td colspan="2">Distance</td><td>107 ly
(33 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G5IV</td></tr><tr> <td>Mass</td> <td style="text-align: center">(m)</td> <td>1.125 M</td></tr><tr> <td>Radius</td> <td style="text-align: center">(r)</td> <td>2.234 ± 0.304 R</td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>5552 K</td></tr><tr> <td>Metallicity</td> <td style="text-align: center">[Fe/H]</td> <td>0.17</td></tr><tr> <td>Age</td> <td style="text-align: center"></td> <td>9.56 Gyr</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.229[1] AU
(34.3 Gm)</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.195 AU
(29.1 Gm)</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.263 AU
(39.4 Gm)</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.15[1]</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>37.82[1] d
(0.1035 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>66.1 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>102[1]°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,454,370 ± 380[1] JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>4.65 ± 0.59[1] m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>0.11[1] MJ
(35 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>5 August 2005
Confirmed 27 May 2007</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Butler et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy</td></tr><tr> <td colspan="2">Discovery site</td> <td>California, Template:Country data United States</td></tr><tr> <td colspan="2">Discovery status</td> <td>Confirmed</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 11964 c is an extrasolar planet approximately 107 light-years away in the constellation of Cetus. The planet was discovered in a close-orbit around the yellow subgiant star HD 11964. The planet has a minimum mass 35 times the mass of Earth and is located in a mildly eccentric orbit which takes almost 38 days to complete. HD 11964 c was a possible planet discovered on the same day as HD 11964 b in 2005. HD 11964 c was first proposed in a paper published in 2007,[2] and finally confirmed with new data presented in a review of multi-planet systems which appeared on the arXiv preprint website in 2008.[1]

Some sources have used the designation "HD 11964 b" for this planet,[3][4] however in their review of the properties of multi-planet extrasolar planetary systems, the discovery team has stated that the correct designation for this planet is HD 11964 c and the reversed system was due to confusion related to private communications between various groups of astronomers.[1]

References Edit

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 (2009). Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems. The Astrophysical Journal 693 (2): 1084–1099.
  2. Wright, J.T. et al. (2007). Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars. The Astrophysical Journal 657 (1): 533–545.
  3. Raghavan, D. et al. (2006). Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems. The Astrophysical Journal 646 (1): 523–542.
  4. Schneider, J.. Notes for planet HD 11964 b. The Extrasolar Planets Encyclopaedia. Retrieved 2008-12-15.

Coordinates: Sky map 01h 57m 09.6064s, −10° 14′ 32.739″ Template:HD 11964


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