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 | |
Mean radius | 0.95±0.06 R🜨 [1] |
Mass | 0.81 M🜨 [2] |
Temperature | 460 ± 5 K (368.33 ± 9.00 °F; 186.85 ± 5.00 °C) [1] |
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 was discovered in 2020 by astronomers in an observatory using the Kepler space telescope. [1] It is also nicknamed the "Pi Earth" because it takes approximately 3.14 days to orbit the host star. [5]
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]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Libra [7] |
Right ascension | 15h 12m 05.1944s [8] |
Declination | −20° 06′ 30.5428″ [8] |
Apparent magnitude (V) | 17.67 [9] |
Characteristics | |
Evolutionary stage | Red dwarf |
Spectral type | M3.5±0.5 V [10] |
Astrometry | |
Radial velocity (Rv) | 6.25±0.17 [10] km/s |
Proper motion (μ) |
RA: −120.013
mas/
yr
[8] Dec.: +74.471 mas/ yr [8] |
Parallax (π) | 17.6353 ± 0.0492 mas [8] |
Distance | 184.9 ± 0.5
ly (56.7 ± 0.2 pc) |
Details [10] | |
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 | |
Database references | |
SIMBAD | data |
K2-315 is a star in the southern zodiac constellation Libra. [11] It has an apparent magnitude of 17.67, [9] requiring a powerful telescope to be seen. The star is relatively close at a distance of 185 light years [8] but is receding with a radial velocity of 6.25 km/s. [10]
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). [10] It has 17.4% the mass of the Sun and 20% its radius. [10] Typical for red dwarves, it has a luminosity less than 1% of the Sun, which yields an effective temperature of 3,300 K. [10] Unlike most planetary hosts, K2-315 is metal-deficient, with an iron abundance only 57% that of the Sun. [10] It is estimated to be over a billion years old, and has a projected rotational velocity less than 5 km/s. [10]
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