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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 00 15 49.24231 |
| Declination | +13° 33′ 22.3163″ |
| Apparent magnitude (V) | 12.6 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | M4V |
| Apparent magnitude (V) | 12.600±0.04 |
| Apparent magnitude (R) | 12.296±0.08 |
| Apparent magnitude (G) | 11.399±0.003 |
| Apparent magnitude (J) | 8.619±0.020 |
| Apparent magnitude (H) | 8.068±0.026 |
| Apparent magnitude (K) | 7.807±0.020 |
| Astrometry | |
| Radial velocity (Rv) | 51.04±0.26 km/s |
| Proper motion (μ) | RA: 618.065 mas/yr Dec.: 329.446 mas/yr |
| Parallax (π) | 82.1938 ± 0.0326 mas |
| Distance | 39.68 ± 0.02 ly (12.166 ± 0.005 pc) |
| Details | |
| Mass | 0.2414±0.0060 M☉ |
| Radius | 0.2617+0.0058 −0.0070 R☉ |
| Luminosity (bolometric) | 0.00728±0.00015 L☉ |
| Surface gravity (log g) | 5.21±0.07 cgs |
| Temperature | 3,296+48 −36 K |
| Metallicity | −0.32±0.06 dex |
| Rotation | 85 days |
| Rotational velocity (v sin i) | <2 km/s |
| Age | 7.0+2.8 −2.2 Gyr |
| Other designations | |
| GJ 12, G 32-5, L 1154-29, LHS 1050, LP 464-42, LTT 10083, NLTT 786, PLX 42, TOI-6251, TIC 52005579, 2MASS J00154919+1333218 | |
| Database references | |
| SIMBAD | data |
Gliese 12 (GJ 12) is a red dwarf star located 39.7 light-years (12.2 parsecs) away in the constellation Pisces. It has about 24% the mass and 26% the radius of the Sun, and a temperature of about 3,296 K (3,023 °C; 5,473 °F). It is an inactive star and hosts one known exoplanet.
Planetary system
The transiting exoplanet Gliese 12 b was discovered by TESS, and two independent studies confirming it as a planet were published in May 2024. Gliese 12 b is similar in size to Earth and Venus, and completes an orbit around its star every 12.8 days. Its mass is poorly constrained but is known to be less than 4 times that of Earth.
Along with the planets of TRAPPIST-1 and LHS 1140 b, Gliese 12 b is one of the nearest known relatively temperate transiting exoplanets, and so is a promising target for the James Webb Space Telescope to determine whether it has retained an atmosphere. Gliese 12 b orbits slightly closer than the inner edge of its star's habitable zone, with an insolation between those of Earth and Venus. Its equilibrium temperature, assuming an albedo of zero, is 315 K (42 °C; 107 °F); if it has an atmosphere, the surface temperature would be greater than this.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | <3.87 M🜨 | 0.0668±0.0024 | 12.761408±0.000050 | <0.50 | 89.194+0.059 −0.052° |
0.958+0.046 −0.048 R🜨 |
References
- "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008. Archived from the original on 15 August 2019. Retrieved 23 May 2024.
- ^ 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.
- ^ "GJ 12". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 May 2024.
- Newton, Elisabeth R.; Charbonneau, David; et al. (January 2014). "Near-infrared Metallicities, Radial Velocities, and Spectral Types for 447 Nearby M Dwarfs". The Astronomical Journal. 147 (1): 20. arXiv:1310.1087. Bibcode:2014AJ....147...20N. doi:10.1088/0004-6256/147/1/20.
- ^ Kuzuhara, Masayuki; Fukui, Akihiko; et al. (23 May 2024). "Gliese 12 b: A Temperate Earth-sized Planet at 12 pc Ideal for Atmospheric Transmission Spectroscopy". The Astrophysical Journal Letters. 967 (2): L21. arXiv:2405.14708. Bibcode:2024ApJ...967L..21K. doi:10.3847/2041-8213/ad3642.
- ^ Dholakia, Shishir; Palethorpe, Larissa; et al. (23 May 2024). "Gliese 12 b, a temperate Earth-sized planet at 12 parsecs discovered with TESS and CHEOPS". Monthly Notices of the Royal Astronomical Society. 531 (1): 1276–1293. arXiv:2405.13118. Bibcode:2024MNRAS.531.1276D. doi:10.1093/mnras/stae1152.
- Reddy, Francis (23 May 2024). "NASA's TESS Finds Intriguing World Sized Between Earth, Venus". NASA. Archived from the original on 23 May 2024. Retrieved 23 May 2024.
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