GJ 1252 is ared dwarf star located 66.5light-years (20.4parsecs) away from theSolar System in the constellation ofTelescopium. The star has about 38% the mass and 39% the radius of theSun, and a temperature of about 3,458 K (3,185 °C; 5,765 °F). GJ 1252 is orbited by one knownexoplanet.[3]
GJ 1252 was found to have a planet, GJ 1252 b, in 2019 usingtransit observations fromTESS.[3] It is aterrestrial planet larger thanEarth, with about 1.3 times the mass and 1.18 times the radius of Earth. Orbiting its star with a very short period of just 12.4 hours, it is presumablytidally locked.Secondary eclipse observations have shown that GJ 1252 b lacks a significant atmosphere, similar toLHS 3844 b andTRAPPIST-1b, and have measured its dayside temperature at about 1,410 K (1,140 °C; 2,080 °F).[5][7]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.32±0.28 M🜨 | 0.00915±0.00015 | 0.51824160 | — | 84.8±3.2° | 1.180±0.078 R🜨 |
