HD 153950 b

HD 153950 b is an extrasolar planet located approximately 162 light-years awayThis 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.[1]

HD 153950 b
Discovery
Discovered byMoutou et al.[1]
Discovery siteLa Silla Observatory
Discovery dateOctober 26, 2008
Doppler spectroscopy
(HARPS)
Orbital characteristics
1.28 ± 0.01 AU (191,500,000 ± 1,500,000 km)
Eccentricity0.34 ± 0.021
499.4 ± 3.6 d
1.367 ± 0.010 y
28.0
2,454,502 ± 4.1
308.2 ± 2.4
StarHD 153950

    The planet HD 153950 b is named Trimobe. The name was selected in the NameExoWorlds campaign by Madagascar, during the 100th anniversary of the IAU. Trimobe is a rich ogre from Malagasy tales.[2][3]

    Characteristics

    Mass and orbit

    HD 153950 b is a Jupiter-size exoplanet. The estimated minimum mass is 2.73 times the mass of Jupiter. The planet has been found to orbit its host star every 500 days at a distance of 1.28 AU, which is approximately 28% more of the mean distance between the Sun and the Earth. HD 153950 b has a mildly elliptical orbit, given its orbital eccentricity of 0.34.[4]

    Temperature

    The temperature of the exoplanet is likely to vary during its orbit, temperatures would likely range from 275–375 K (2–102 °C; 35–215 °F) as it approaches its periastron/apastron of its orbit. This would also likely apply to a potentially habitable hypothetical moon orbiting the gas giant exoplanet (see below).

    Host star
    Main article: HD 153950

    HD 153950 is an F-type star with a mass that is 1.13 times the mass of the Sun and a size that is 1.34 times the radius of the Sun. In other words, it is slightly more massive and slightly larger than the Sun is. With an effective temperature of 6076 K, HD 205739 is also hotter than the Sun, although it is younger, at an estimated age of 4.3 billion years, 250–300 million years younger than the Sun.[4] The star is almost the same as the Sun in terms of metal; its measured metallicity is [Fe/H] = -0.01.[4] HD 153950 cannot be seen from Earth with the naked eye because the star has an apparent magnitude (V) of 7.39.[4]

    Habitability

    HD 153950 b is located within the habitable zone of its star. The exoplanet, with a mass of 2.73 MJ, is too massive to be rocky, and because of this the planet itself is not expected to habitable. However, based on a probable 10−4 fraction of the planet mass as a satellite,[5] it may have a large enough moon with a sufficient atmosphere and pressure, and liquid water at its surface, potentially making it habitable.[6] On the other hand, this mass can be distributed into many small satellites as well.

    Discovery

    HD 153950's designation is from the Henry Draper catalogue. The star was also observed by Hipparcos, which released its catalogue in 1997. The observations that led to the discovery of the planet HD 153950 b started when the N2K Consortium started an extended search for planets around 300 stars not usually targeted by Doppler spectroscopy surveys. In the case of HD 153950, the star was observed using telescopes at the La Silla Observatory in Chile.

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    See also

    References
    1. Moutou, C.; et al. (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. arXiv:0810.4662. Bibcode:2009A&A...496..513M. doi:10.1051/0004-6361:200810941.
    2. "Approved names". NameExoworlds. Retrieved 2020-01-02.
    3. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
    4. Jean Schneider (2007). "Notes for star HD 153950". Extrasolar Planets Encyclopaedia. Retrieved 25 June 2016.
    5. Canup R.M., Ward W.R. (2006). A common mass scaling for satellite systems of gaseous planets. Nature, 441: 834–839.
    6. The Habitable Exoplanets Catalog: Data of Potential Habitable Worlds

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