HD 7924 b

HD 7924 b is an extrasolar planet located approximately 55 light years away in the constellation of Cassiopeia, orbiting the 7th magnitude K-type main sequence (slightly metal poor) star HD 7924.[1] It was published on January 28, 2009 and is the second planet discovered in the constellation Cassiopeia. Two additional planets in this system were discovered in 2015.[2]

HD 7924 b
HD 7924 b's orbit compared to Mercury's (0.38AU).
Discovery
Discovered byHoward et al.
Discovery dateJanuary 28, 2009
radial velocity
Orbital characteristics
0.057 AU (8,500,000 km)
Eccentricity0.17 ± 0.16
5.3978 ± 0.0015 d
4727.27 ± 0.87
25 ± 60
StarHD 7924

    Super-Earth

    HD 7924 b is a super-Earth exoplanet with a minimum mass 9.2 times that of Earth and takes only about 129.5 hours to orbit the star, at an average distance of 8,500,000 km (5,300,000 mi). When HD 7924 b was discovered in 2009, it was one of only eight planets known with a minimum mass less than 10 Earths.[1] Also a super-Earth discovery makes 2009 the fifth year in a row since 2005 to have super-Earth planets discovered.

    Characteristics

    While the radius of HD 7924 b is unknown, depending on its composition, it will be between 1.4–6 times the diameter of the Earth.[1] It is unknown whether this planet is rocky or gaseous. Since the true mass of this planet is not known, it might be gaseous if the true mass is considerably more than minimum mass. If the true mass is near the minimum mass of 9.2 ME, then this planet could be rocky.

    gollark: Haskell meets 1 (obviously), 2, 3, kind of 5 and maaaybe 7.
    gollark: - nice, nonbrackety haskell syntax- functional-programming-oriented- strongly typed- pragmatic and not horribly complicated - yes, selective applicative functors or whatever new haskell thing is now being worked on may be elegant, but learning every needlessly fancy thing just takes away from *actually writing useful stuff*- good tooling (see: Rust; run screaming from: Go, C(++))- web platform, ideally (yes, it has Problems™, but there's something to be said for ability to just navigate to a webpage and run your stuff- good libraries/community
    gollark: I'll probably never find a language which satisfies all my wants:
    gollark: <:ninja:445055784057962497>
    gollark: What is this?

    References
    1. Howard, Andrew W.; et al. (2009). "The NASA-UC Eta-Earth Program. I. A Super-Earth Orbiting HD 7924". The Astrophysical Journal. 696 (1): 75–83. arXiv:0901.4394. Bibcode:2009ApJ...696...75H. doi:10.1088/0004-637X/696/1/75.
    2. Fulton, Benjamin J.; et al. (2015). "Three Super-Earths Orbiting HD 7924". The Astrophysical Journal. 805 (2): 175. arXiv:1504.06629. Bibcode:2015ApJ...805..175F. doi:10.1088/0004-637X/805/2/175.

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