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HD 104985 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 104985</td></tr><tr> <td colspan="2">Constellation</td> <td>Camelopardalis</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>12h 05m 15.119s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+76° 54′ 20.65″[1]</td></tr><tr><td colspan="2">Distance</td><td>317 ± 8[1] ly
(97 ± 2[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G9III</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.78 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.76 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.80 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.03 ± 0.02</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>198.2 ± 0.3 d
(0.5426 ± 0.0008 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>43 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>310 ± 30°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2451990 ± 20 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>161 ± 2 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>6.33 MJ
(2010 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>June 26, 2003</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Sato et al.[2]</td></tr><tr> <td colspan="2">Discovery method</td> <td>radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>Okayama Planet
Search Program

Template:Country data Japan</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 104985 b is an extrasolar planet that takes 198 days to orbit at the distance of 0.78 AU. It is definitely a gas giant since it has mass 61/3 times Jupiter.[2][3]

References Edit

  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. 2.0 2.1 2.2 (2003). A Planetary Companion to the G-Type Giant Star HD 104985. The Astrophysical Journal Letters 597 (2): L157–L160.
  3. (2008). Planetary Companions around Three Intermediate-Mass G and K Giants: 18 Delphini, ξ Aquilae and HD 81688. Publications of the Astronomical Society of Japan 60 (3): 539–550.

External links Edit

Coordinates: Sky map 12h 05m 15.1178s, +76° 54′ 20.641″


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