GJ 1252
Observation data
Epoch J2000      Equinox J2000
Constellation Telescopium[1]
Right ascension 20h 27m 42.08140s[2]
Declination −56° 27′ 25.1519″[2]
Apparent magnitude (V) 12.193[3]
Characteristics
Evolutionary stage Main sequence
Spectral type M2.5V[4]
Apparent magnitude (B) 13.655±0.029[3]
Apparent magnitude (V) 12.193±0.056[3]
Apparent magnitude (G) 11.235±0.003[2]
Apparent magnitude (J) 8.697±0.019[3]
Apparent magnitude (H) 8.161±0.034[3]
Apparent magnitude (K) 7.915±0.023[3]
Astrometry
Radial velocity (Rv)7.38±0.29[2] km/s
Proper motion (μ) RA: 424.417 mas/yr[2]
Dec.: −1,230.941 mas/yr[2]
Parallax (π)49.0555 ± 0.0247 mas[2]
Distance66.49 ± 0.03 ly
(20.39 ± 0.01 pc)
Details[3]
Mass0.381±0.019 M☉
Radius0.391±0.020 R☉
Luminosity (bolometric)0.0196+0.0026
−0.0023 L☉
Surface gravity (log g)4.49[2] cgs
Temperature3,458+140
−133 K
Metallicity [Fe/H]0.1±0.1 dex
Age3.9±0.4[5] 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[6]
Database references
SIMBADdata

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.[3]

Planetary system

Artist's impression of GJ 1252 b[7]

GJ 1252 was found to have a planet, GJ 1252 b, in 2019 using transit observations from TESS.[3] 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).[5][7]

The GJ 1252 planetary system[5]
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

  1. ↑ "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.
  2. 1 2 3 4 5 6 7 8 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.
  3. 1 2 3 4 5 6 7 8 9 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.
  4. ↑ 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.
  5. 1 2 3 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.
  6. ↑ "GJ 1252". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 May 2023.
  7. 1 2 Gohd, Chelsea (11 October 2022). "Discovery Alert: Ultra-hot 'Super-Earth' Could Have No Atmosphere". NASA. Retrieved 8 May 2023.
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