astro.wikisort.org - Star
L 168-9 (also known as GJ 4332 or TOI-134) is a red dwarf star located 82.1 light-years (25.2 pc) away from the Solar System in the constellation of Tucana. The star has about 62% the mass and 60% the radius of the Sun. It has a temperature of 3,800 K (3,530 °C; 6,380 °F) and a rotation period of 29.8 days. L 168-9 is orbited by one known exoplanet.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Tucana[1] |
| Right ascension | 23h 20m 07.5245152328s[2] |
| Declination | −60° 03′ 54.644655927″[2] |
| Apparent magnitude (V) | 11.02±0.06[3] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | M1V[3] |
| Apparent magnitude (B) | 12.45±0.19[3] |
| Apparent magnitude (V) | 11.02±0.06[3] |
| Apparent magnitude (G) | 10.237±0.003[2] |
| Apparent magnitude (J) | 7.941±0.019[3] |
| Apparent magnitude (H) | 7.320±0.053[3] |
| Apparent magnitude (K) | 7.082±0.031[3] |
| Astrometry | |
| Radial velocity (Rv) | 29.44±0.21[2] km/s |
| Proper motion (μ) | RA: −319.924±0.025 mas/yr[2] Dec.: −127.782±0.026 mas/yr[2] |
| Parallax (π) | 39.7113 ± 0.0244 mas[2] |
| Distance | 82.13 ± 0.05 ly (25.18 ± 0.02 pc) |
| Details[3] | |
| Mass | 0.62±0.03 M☉ |
| Radius | 0.600±0.022 R☉ |
| Luminosity (bolometric) | 0.0673±0.0024 L☉ |
| Surface gravity (log g) | 4.04±0.49 cgs |
| Temperature | 3800±70 K |
| Metallicity [Fe/H] | 0.04±0.17 dex |
| Rotation | 29.8±1.3 d |
| Other designations | |
| Database references | |
| SIMBAD | data |
Planetary system
The exoplanet L 168-9 b was discovered in 2020 using TESS. It is a terrestrial super-Earth with about 4.6 times the mass and 1.39 times the radius of Earth, and an estimated equilibrium temperature of 965 K (692 °C; 1,277 °F). L 168-9 b is a target for observation and atmospheric characterization with the James Webb Space Telescope,[3] and has been observed as one of its first targets.[5]
In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.[6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 4.60±0.56 M🜨 | 0.02091±0.00024 | 1.40150±0.00018 | <0.21 | 85.5+0.8 −0.7° |
1.39±0.09 R🜨 |
References
- "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008. Retrieved 30 August 2022.
- Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
- Astudillo-Defru, N.; Cloutier, R.; et al. (April 2020). "A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESS". Astronomy & Astrophysics. 636: A58. arXiv:2001.09175. Bibcode:2020A&A...636A..58A. doi:10.1051/0004-6361/201937179.
- "L 168-9". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 August 2022.
- Rigby, Jane; Perrin, Marshall; McElwain, Michael; Kimble, Randy; Friedman, Scott; Lallo, Matt; Doyon, René; Feinberg, Lee; Ferruit, Pierre; Glasse, Alistair; Rieke, Marcia; et al. (12 July 2022). "Characterization of JWST science performance from commissioning". arXiv:2207.05632 [astro-ph.IM].
- "List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Retrieved 27 August 2022.
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