L 168-9

L 168-9 (also known as GJ 4332 or TOI-134, officially named Danfeng) is a red dwarf star located 82.1 light-years (25.2 parsecs) 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]

L 168-9 / Danfeng
Observation data
Epoch J2000      Equinox J2000
Constellation Tucana[1]
Right ascension 23h 20m 07.52452s[2]
Declination −60° 03′ 54.6447″[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 mas/yr[2]
Dec.: −127.782 mas/yr[2]
Parallax (π)39.7113 ± 0.0244 mas[2]
Distance82.13 ± 0.05 ly
(25.18 ± 0.02 pc)
Details[3]
Mass0.62±0.03 M☉
Radius0.600±0.022 R☉
Luminosity (bolometric)0.0673±0.0024 L☉
Surface gravity (log g)4.04±0.49 cgs
Temperature3800±70 K
Metallicity [Fe/H]0.04±0.17 dex
Rotation29.8±1.3 d
Other designations
Danfeng, CD−60 8051, GJ 4332, HIP 115211, L 168-9, LTT 9494, NLTT 56509, PM J23201-6003, TOI-134, TIC 234994474, TYC 9126-748-1, 2MASS J23200751-6003545, WISEA J232007.06-600355.8[4]
Database references
SIMBADdata

Nomenclature

The designation L 168-9 comes from Luyten's first catalogue of stars with high proper motion.

In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.[5] The approved names, proposed by a team from China, were announced in June 2023. L 168-9 is named Danfeng and its planet is named Qingluan, after mythological birds of ancient China.[6]

Planetary system

The exoplanet L 168-9 b, officially named Qingluan, 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.[7][8]

The L 168-9 planetary system[3]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Qingluan 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
  1. "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008. Retrieved 30 August 2022.
  2. 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. 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. S2CID 210920549.
  4. "L 168-9". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 August 2022.
  5. "List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Retrieved 27 August 2022.
  6. "2022 Approved Names". nameexoworlds.iau.org. IAU. Retrieved 7 June 2023.
  7. Rigby, Jane; Perrin, Marshall; McElwain, Michael; Kimble, Randy; Friedman, Scott; Lallo, Matt; Doyon, René; Feinberg, Lee; Ferruit, Pierre; Glasse, Alistair; Rieke, Marcia; et al. (April 2023). "The Science Performance of JWST as Characterized in Commissioning". Publications of the Astronomical Society of the Pacific. 135 (1046): 048001. arXiv:2207.05632. Bibcode:2023PASP..135d8001R. doi:10.1088/1538-3873/acb293.
  8. Bouwman, Jeroen; Kendrew, Sarah; et al. (March 2023). "Spectroscopic Time Series Performance of the Mid-infrared Instrument on the JWST". Publications of the Astronomical Society of the Pacific. 135 (1045): 038002. arXiv:2211.16123. Bibcode:2023PASP..135c8002B. doi:10.1088/1538-3873/acbc49.
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