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HD 153950 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 153950</td></tr><tr> <td colspan="2">Constellation</td> <td>Scorpius</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>17h 04m 30.870s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–43° 18′ 35.18″[1]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>7.39</td></tr><tr><td colspan="2">Distance</td><td>162 ± 6[1] ly
(50 ± 2[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>F8V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.28 ± 0.01 AU
(191 ± 1 Gm)</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.34 ± 0.021</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>499.4 ± 3.6 d
(1.367 ± 0.010 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>28.0 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>308.2 ± 2.4°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,454,502 ± 4.1 JD</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>2.73 ± 0.05 MJ
(868 ± 16 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>October 26, 2008</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Moutou et al.[2]</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy
(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 153950 b is an extrasolar planet located approximately 162 light-years away[1] in the constellation of Scorpius, orbiting the 7th magnitude F-type main sequence star HD 153950. This planet has mass about 2.73 times that of Jupiter, but because the inclination is not known, the mass value is only minimum. So in next decade, the Gaia mission, Space Interferometry Mission, or James Webb Space Telescope will determine the inclination of all known extrasolar planets, including this planet. This planet takes about 499 days to orbit at an orbital distance about 1.28 AU and range from 0.84 to 1.72 AU, corresponding to the orbital eccentricity of 0.34.

This planet was discovered on October 26, 2008 by Moutou et al. using the HARPS spectrograph on ESO’s 3.6 meter telescope installed at La Silla Observatory in Atacama desert, Chile.[2]

Possible habitable moon Edit

HD 153950 b is located within a habitable zone of its star. Based on a probable 10−4 fraction of the planet mass as a satellite,[3] it can have a Mars-sized moon with habitable surface.[4] On the other hand, this mass can be distributed into many small satellites as well.

See also Edit

References Edit

  1. 1.0 1.1 1.2 1.3 1.4 (2007). Validation of the new Hipparcos reduction. Astronomy and Astrophysics 474 (2): 653–664.Vizier catalog entry
  2. 2.0 2.1 2.2 (2009). The HARPS search for southern extra-solar planets XVII. Six long-period giant planets around BD -17 0063, HD 20868, HD 73267, HD 131664, HD 145377, HD 153950. Astronomy and Astrophysics 496 (2): 513–519.
  3. Canup R.M., Ward W.R. (2006). A common mass scaling for satellite systems of gaseous planets. Nature, 441: 834-839.
  4. The Habitable Exoplanets Catalog: Data of Potential Habitable Worlds

External links Edit

Coordinates: Sky map 17h 04m 30.8715s, −43° 18′ 35.172″


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