| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 20 27 42.08140 |
| Declination | −56° 27′ 25.1519″ |
| Apparent magnitude (V) | 12.193 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | M2.5V |
| Apparent magnitude (B) | 13.655±0.029 |
| Apparent magnitude (V) | 12.193±0.056 |
| Apparent magnitude (G) | 11.235±0.003 |
| Apparent magnitude (J) | 8.697±0.019 |
| Apparent magnitude (H) | 8.161±0.034 |
| Apparent magnitude (K) | 7.915±0.023 |
| Astrometry | |
| Radial velocity (Rv) | 7.38±0.29 km/s |
| Proper motion (μ) | RA: 424.417 mas/yr Dec.: −1,230.941 mas/yr |
| Parallax (π) | 49.0555 ± 0.0247 mas |
| Distance | 66.49 ± 0.03 ly (20.39 ± 0.01 pc) |
| Details | |
| Mass | 0.381±0.019 M☉ |
| Radius | 0.391±0.020 R☉ |
| Luminosity (bolometric) | 0.0196+0.0026 −0.0023 L☉ |
| Surface gravity (log g) | 4.49 cgs |
| Temperature | 3,458+140 −133 K |
| Metallicity | 0.1±0.1 dex |
| Age | 3.9±0.4 Gyr |
| Other designations | |
| GJ 1252, L 210-70, LFT 1546, LHS 492, LTT 8083, NLTT 49258, PM J20277-5627, TOI-1078, TIC 370133522, GCRV 26183, 2MASS J20274210-5627262 | |
| Database references | |
| SIMBAD | data |
GJ 1252 is a red dwarf star located 66.5 light-years (20.4 parsecs) away from the Solar System in the constellation of Telescopium. The star has about 38% the mass and 39% the radius of the Sun, and a temperature of about 3,458 K (3,185 °C; 5,765 °F). GJ 1252 is orbited by one known exoplanet.
Planetary system
GJ 1252 was found to have a planet, GJ 1252 b, in 2019 using transit observations from TESS. It is a terrestrial planet larger than Earth, 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 presumably tidally locked. Secondary eclipse observations have shown that GJ 1252 b lacks a significant atmosphere, similar to LHS 3844 b and TRAPPIST-1b, and have measured its dayside temperature at about 1,410 K (1,140 °C; 2,080 °F).
| 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🜨 |
References
- "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.
- ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ Shporer, Avi; Collins, Karen A.; et al. (February 2020). "GJ 1252 b: A 1.2 R⊕ Planet Transiting an M3 Dwarf at 20.4 pc". The Astrophysical Journal Letters. 890 (1): L7. arXiv:1912.05556. Bibcode:2020ApJ...890L...7S. doi:10.3847/2041-8213/ab7020.
- Reid, I. Neill; et al. (October 1995). "The Palomar/MSU Nearby-Star Spectroscopic Survey. I. The Northern M Dwarfs -Bandstrengths and Kinematics". Astronomical Journal. 110: 1838. Bibcode:1995AJ....110.1838R. doi:10.1086/117655.
- ^ Crossfield, Ian J. M.; Malik, Matej; et al. (September 2022). "GJ 1252b: A Hot Terrestrial Super-Earth with No Atmosphere". The Astrophysical Journal Letters. 937 (1): L17. arXiv:2208.09479. Bibcode:2022ApJ...937L..17C. doi:10.3847/2041-8213/ac886b.
- "GJ 1252". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 May 2023.
- ^ Gohd, Chelsea (11 October 2022). "Discovery Alert: Ultra-hot 'Super-Earth' Could Have No Atmosphere". NASA. Retrieved 8 May 2023.
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