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HD 139357 b is a very massive extrasolar planet or brown dwarf located approximately 390 light years away, orbiting the 6th magnitude K-type giant star HD 139357 in the constellation of Draco. The detection occurred on March 20, 2009, which was the first day of spring.

HD 139357 b
Discovery
Discovered byDoellinger et al.[1]
Discovery siteTLS
Discovery dateMarch 20, 2009
Detection method
radial velocity
Orbital characteristics
Apastron2.60 AU (389,000,000 km)
Periastron2.12 AU (317,000,000 km)
Semi-major axis
2.36 ± 0.2 AU (353,000,000 ± 30,000,000 km)
Eccentricity0.1 ± 0.02
Orbital period (sidereal)
1125.7 ± 9 d
3.0819 ± 0.0246 y
Time of periastron
2452466.7 ± 3.2
Argument of periastron
235.4 ± 10.6
StarHD 139357

    The actual mass and radius of this body remain known, but it has a minimum mass of nearly 10 times that of Jupiter and a radius of probably no more than 1.2 times Jupiter's. Most likely this is a brown dwarf rather than a planet. The reason why the object's true mass is unknown is due to the undetermined inclination of its orbital plane. Follow up observations via direct imaging may determine its radius and orbital inclination, thereby giving its density and surface gravity, which will allow a determination as to whether this object is a brown dwarf or a supermassive planet.

    As it is typical for supermassive planets, this orbits further from its host star than Earth is from the Sun. The planet's year is over three Earth years. However, the orbital eccentricity of this object is much greater than Earth's: 0.1 vs. 0.017. Like most known extrasolar planets, it was detected by the wobble method, which detects planets through the circular wobbling motion of the star caused by the gravity of orbiting body.


    See also



    References


    1. Döllinger, M. P.; et al. (2009). "Planetary companion candidates around the K giant stars 42 Draconis and HD 139 357". Astronomy and Astrophysics. 499 (3): 935–942. arXiv:0903.3593. Bibcode:2009A&A...499..935D. doi:10.1051/0004-6361/200810837.



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    HD 139357 b — планета-гигант (9.76 ± 2.15 масс Юпитера), обращающаяся вокруг красного гиганта HD 139357 . Открыт группой немецких и итальянских астрономов, с помощью метода доплеровской спектроскопии в 2009 году.



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