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K2-315b is an exoplanet located 185.3 light years away from Earth in the southern zodiac constellation Libra.[3][4] It orbits the red dwarf K2-315.

K2-315b
An artist's impression of a small rocky planet like K2-315b
Discovery[1]
Discovered byKepler (K2)
Discovery date2020
Detection method
Transit
Orbital characteristics[1]
Semi-major axis
0.02±0.00 AU
Orbital period (sidereal)
3.14±0.00 d
Inclination88.7°±0.2°
Physical characteristics
Mean radius
0.95±0.06 R🜨[1]
Mass0.81 M🜨[2]
Temperature460 ± 5 K (368.33 ± 9.00 °F; 186.85 ± 5.00 °C)[1]

    Discovery


    K2-315b was discovered in 2020 by astronomers in an observatory using the Kepler space telescope.[1] It is also nicknamed the "Pi Planet" because it takes approximately 3.14 days to orbit the host star.[5]


    Physical properties


    The planet is thought to be a small rocky planet, even though composition is unknown.[5] Since it orbits very close to its star, it is too hot to host life, due to it having a scorching temperature of 450 K. Not much is known about it because it was just discovered, but it is similar to Earth, having a radius 95% that of Earth,[6] very similar to Venus, but has 81% Earth's mass.[2]


    References


    1. Niraula, Prajwal; Julien de Wit; Rackham, Benjamin V.; Ducrot, Elsa; Burdanov, Artem; Crossfield, Ian J. M.; Valerie Van Grootel; Murray, Catriona; Garcia, Lionel J.; Alonso, Roi; Beard, Corey; Yilen Gomez Maqueo Chew; Delrez, Laetitia; Demory, Brice-Olivier; Fulton, Benjamin J.; Gillon, Michael; Gunther, Maximilian N.; Howard, Andrew W.; Issacson, Howard; Jehin, Emmanuel; Pedersen, Peter P.; Pozuelos, Francisco J.; Queloz, Didier; Rebolo-Lopez, Rafael; Sairam, Lalitha; Sebastian, Daniel; Thompson, Samantha; Triaud, Amaury H. M. J. (2020). "π Earth: A 3.14-day Earth-sized Planet from K2's Kitchen Served Warm by the SPECULOOS Team". arXiv:2006.07308 [astro-ph.EP].
    2. "Eyes On Exoplanets – Exoplanet Exploration: Planets Beyond our Solar System". exoplanets.nasa.gov. Retrieved 2021-08-08.
    3. "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. NASA. Retrieved 2020-10-22.
    4. September 2020, Mike Wall 22. "'Pi planet' alien world takes 3.14 days to orbit its star". Space.com. Retrieved 2020-10-22.
    5. Starr, Michelle. "Astronomers Discover "Pi Earth" Exoplanet Orbits Its Star Once Every 3.14 Days". ScienceAlert. Retrieved 2020-10-21.
    6. "Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2020-10-21.

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