Kepler-421b

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Kepler-421b
Discovery
Discovery site Kepler telescope
Discovery date2014
Transit
Orbital characteristics
1.219 AU (182,400,000 km)
704.1984 d
Inclination 89.965
Star Kepler-421
Physical characteristics
4.16 R🜨
Mass 16.1 M🜨

    Kepler-421b is an exoplanet that, as of July 2014, [1] has the longest known year of any transiting planet (704 days), [2] although not as long as the planets that have been directly imaged, or many of the planets found by the radial-velocity method, or as long as some transiting planet candidates which are listed as planets in the Extrasolar Planets Encyclopaedia (KIC 5010054 b etc.). [3] It is the first transiting-planet found near the snow-line.

    Normally, at least three transits are required to confirm a planet. Due to very high signal to noise ratio, only two transits were sufficient to validate Kepler-421b to be a real planet without additional confirmation methods.

    Kepler-421b is slightly larger than Uranus, and having a mass 16.1 times [4] that of Earth, typical of an ice giant.

    References

    1. Kipping, D. M.; Torres, G.; Buchhave, L. A.; Kenyon, S. J.; Henze, C.; Isaacson, H.; Kolbl, R.; Marcy, G. W.; Bryson, S. T.; Stassun, K.; Bastien, F. (2014), "Discovery of a Transiting Planet Near the Snow-Line", The Astrophysical Journal, 795 (1): 25, arXiv: 1407.4807 , Bibcode:2014ApJ...795...25K, doi:10.1088/0004-637X/795/1/25, S2CID   119240746
    2. Johnson, Michele (July 21, 2014). "Astronomers Discover Transiting Exoplanet with Longest Known Year". NASA . Archived from the original on April 17, 2018. Retrieved July 25, 2014.
    3. "The Extrasolar Planet Encyclopaedia — Catalog Listing". Extrasolar Planets Encyclopaedia .
    4. "Kepler-421 b - NASA Science". science.nasa.gov. Retrieved 2024-12-19.

    Further reading