K2-315b
Warm terrestrial exoplanet orbiting K2-315
From Wikipedia, the free encyclopedia
K2-315b is an exoplanet located 185.3 light years away from Earth in the southern zodiac constellation Libra.[2][3] It orbits the red dwarf K2-315.
Size comparison of the planet K2-315b (artistic concept) with Earth | |
| Discovery[1] | |
|---|---|
| Discovered by | Kepler (K2) |
| Discovery date | 2020 |
| Transit | |
| Orbital characteristics[1] | |
| 0.02±0.00 AU | |
| 3.14±0.00 d | |
| Inclination | 88.7°±0.2° |
| Physical characteristics | |
| 0.95±0.06 R🜨[1] | |
| Temperature | 460 ± 5 K (368.33 ± 9.00 °F; 186.85 ± 5.00 °C)[1] |
Discovery
Physical properties
The planet is thought to be a small rocky planet, even though composition is unknown.[4] 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,[7] very similar to Venus.
Host star
 The location of K2-315 (circled in red) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Libra[8] |
| Right ascension | 15h 12m 05.1944s[9] |
| Declination | −20° 06′ 30.5428″[9] |
| Apparent magnitude (V) | 17.67[10] |
| Characteristics | |
| Evolutionary stage | Red dwarf |
| Spectral type | M3.5±0.5 V[11] |
| Astrometry | |
| Radial velocity (Rv) | 6.25±0.17[11] km/s |
| Proper motion (μ) | RA: −120.013 mas/yr[9] Dec.: +74.471 mas/yr[9] |
| Parallax (π) | 17.6353±0.0492 mas[9] |
| Distance | 184.9 ± 0.5 ly (56.7 ± 0.2 pc) |
| Details[11] | |
| Mass | 0.174±0.004 M☉ |
| Radius | 0.2±0.01 R☉ |
| Luminosity | 0.398% L☉ |
| Surface gravity (log g) | 5.094±0.006 cgs |
| Temperature | 3,300±30 K |
| Metallicity [Fe/H] | −0.24±0.09 dex |
| Rotational velocity (v sin i) | <5 km/s |
| Age | >1 Gyr |
| Other designations | |
| K2-315, EPIC 249631677 | |
| Database references | |
| SIMBAD | data |
K2-315 is a star in the southern zodiac constellation Libra.[12] It has an apparent magnitude of 17.67,[10] requiring a powerful telescope to be seen. The star is relatively close at a distance of 185 light years[9] but is receding with a radial velocity of 6.25 km/s.[11]
K2-315 has a stellar classification of M3.5±0.5 V, indicating that it is a M-type main-sequence star (with 14% uncertainty).[11] It has 17.4% the mass of the Sun and 20% its radius.[11] Typical for red dwarfs, it has a luminosity less than 1% of the Sun, which yields an effective temperature of 3,300 K.[11] Unlike most planetary hosts, K2-315 is metal-deficient, with an iron abundance only 57% that of the Sun.[11] It is estimated to be over a billion years old, and has a projected rotational velocity less than 5 km/s.[11]
