HD 122430 b

HD 122430 b is a proposed giant planet orbiting around the giant star HD 122430. It has a mass at least 3.71 times that of Jupiter. This planet located at a distance of 1.02 astronomical units away from its star, which is very similar to the Earth's distance from the Sun. Despite of this, the higher luminosity of the star implies it is heated much more strongly than the Earth is. Its orbit is highly eccentric, around 68%. At periastron, the orbital distance from its parent star is 0.33 AU. At apastron, the distance is 1.71 AU. If this planet were in the Solar System, its orbit would range from just within Mercury's orbit to just beyond Mars’s orbit.

HD 122430 b
Discovery
Discovered bySetiawan et al.
Discovery siteSpain
Discovery dateApril 14, 2003
radial velocity
Orbital characteristics
Apastron1.71 AU (256 Gm)
Periastron0.33 AU (49 Gm)
1.02 AU (153 Gm)
Eccentricity0.68±0.09
344.95±1.08 d
0.94441 y
32.3
2451986.71±3.75
91.04±17.27
Semi-amplitude2.02
StarHD 122430

    In Spain, Setiawan discovered this planet in 2003, using the radial velocity method.[1] However, a follow-up study by Soto et al. (2015) failed to detect a signal via the radial velocity method, so it remains unconfirmed.[2]

    See also

    References
    1. Setiawan, J. (2003). "Planets around evolved stars". In Fridlund, M.; Henning, T. (eds.). Proceedings of the Conference on Towards Other Earths: DARWIN/TPF and the Search for Extrasolar Terrestrial Planets. ESA Publications Division. pp. 595–598. Bibcode:2003ESASP.539..595S. ISBN 92-9092-849-2.
    2. Soto, M. G.; et al. (August 2015). "RAFT - I. Discovery of new planetary candidates and updated orbits from archival FEROS spectra". Monthly Notices of the Royal Astronomical Society. 451 (3): 3131–3144. arXiv:1505.04796. Bibcode:2015MNRAS.451.3131S. doi:10.1093/mnras/stv1144.


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