K2-315

K2-315 is a star in the constellation Libra.[3] It is one of the faintest stars in the night sky, and hosts the Pi Planet.[4][5] K2-315 is a red dwarf star recently discovered in 2020, and not much is known about the star.[6]

K2-315
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Libra[1]
Right ascension 15h 12m 05.19s[2]
Declination −20° 06′ 30.55″[2]
Apparent magnitude (V) 17.67[2]
Characteristics
Evolutionary stage Red dwarf
Spectral type M3.5V[2]
Astrometry
Radial velocity (Rv)+6.25[2] km/s
Proper motion (μ) RA: −120.3[2] mas/yr
Dec.: +74.7[2] mas/yr
Distance185[2] ly
(56.8 pc)
Details[2]
Mass0.174 M☉
Radius0.196 R☉
Luminosity0.0041 L☉
Surface gravity (log g)5.094 cgs
Temperature3,300 K
Metallicity [Fe/H]−0.24 dex
Rotational velocity (v sin i)<5 km/s
Age>1 Gyr
Other designations
K2-315, EPIC 249631677
Database references
SIMBADdata

Planetary system

In 2020, a rock terrestrial was discovered by the Kepler K2 Mission. Its equilibrium temperature is 460±5, making it unlikely to be habitable.[7]

The K2-315 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 1? M⊕ 25.72+0.16-0.17 3.14 — 88.74+0.21-0.16° 0.95 R⊕

See also
  • K2-315b, an exoplanet rotating around K2-315.

References
  1. "Find the constellation which contains given sky coordinates". djm.cc.
  2. Niraula, Prajwal; Wit, Julien de; Rackham, Benjamin V.; Ducrot, Elsa; Burdanov, Artem; Crossfield, Ian J. M.; Grootel, Valérie Van; Murray, Catriona; Garcia, Lionel J.; Alonso, Roi; Beard, Corey; Maqueo Chew, Yilen Gómez; Delrez, Laetitia; Demory, Brice-Olivier; Fulton, Benjamin J.; Gillon, Michaël; Günther, Maximilian N.; Howard, Andrew W.; Issacson, Howard; Jehin, Emmanuël; Pedersen, Peter P.; Pozuelos, Francisco J.; Queloz, Didier; Rebolo-López, Rafael; Lalitha, Sairam; 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". The Astronomical Journal. 160 (4): 172. arXiv:2006.07308. Bibcode:2020AJ....160..172N. doi:10.3847/1538-3881/aba95f. S2CID 219635862.
  3. "Odkryto "Ziemię Pi". Okrąża swoją gwiazdę raz na 3,14 dnia". www.national-geographic.pl.
  4. "Astronomers discover an Earth-sized "pi planet" with a 3.14-day orbit". MIT News | Massachusetts Institute of Technology. Retrieved 2020-10-15.
  5. Starr, Michelle. "Astronomers Discover 'Pi Earth' Exoplanet Orbits Its Star Once Every 3.14 Days". ScienceAlert.
  6. Bonilla, Juan Miguel Hernández (October 2, 2020). "Pi Earth: el nuevo planeta del tamaño de la Tierra que orbita su estrella cada 3,14 días". EL PAÍS.
  7. 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 $\textit{K2}$'s Kitchen Served Warm by the SPECULOOS Team". arXiv:2006.07308 [astro-ph.EP].


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