LHS 1478

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LHS 1478
Observation data
Epoch J2000       Equinox J2000
Constellation Cassiopeia [1]
Right ascension 02h 57m 18.25955s [2]
Declination +76° 33′ 11.2535″ [2]
Apparent magnitude  (V)13.3 [3]
Characteristics
Evolutionary stage main sequence [4]
Spectral type M3V [5]
Astrometry
Radial velocity (Rv)+69.79±0.27 [2] km/s
Proper motion (μ)RA: +690.920 mas/yr [2]
Dec.: −399.894 mas/yr [2]
Parallax (π)54.9036±0.0177  mas [2]
Distance 59.41 ± 0.02  ly
(18.214 ± 0.006  pc)
Absolute magnitude  (MV)+12.1 [4]
Details [5]
Mass 0.236±0.012  M☉
Radius 0.246±0.008  R☉
Luminosity 0.00715±0.00012  L☉
Surface gravity (log g)4.87±0.06  cgs
Temperature 3381±54  K
Metallicity [Fe/H]−0.13±0.19  dex
Rotation ~6.4 d
Rotational velocity (v sin i)<2 km/s
Other designations
G 245-61, LHS 1478, LP 14-53, NLTT 9256, TOI-1640, TIC 396562848 [6]
Database references
SIMBAD data
Exoplanet Archive data

LHS 1478 (also known as TOI-1640) is a M3V-type main sequence star located 59.4 light-years from Earth in the constellation of Cassiopeia. [7] It has a mass of 0.24 solar masses and a radius of 0.25 solar radii. It has an effective temperature of 3381 Kelvin. The star is fairly inactive with no major flaring activity. [5] [8]

Planetary system

There is currently only one known exoplanet orbiting around the star named LHS 1478 b. It is a hot super-Earth with a mass of 2.33 Earths and a radius of 1.24 Earths. It has an equilibrium temperature of about ~595 K. [5] James Webb Space Telescope observations disfavor the possibility of a low-albedo bare rock, suggesting that the planet either has an atmosphere or a high albedo. [8]

The LHS 1478 planetary system [5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 2.33±0.20  M🜨 0.01848+0.00061
−0.00063		1.9495378(41)—87.452+0.052
−0.048 ° 		1.242+0.051
−0.049  R🜨

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 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. ↑ Carrión-González, Óscar; Kammerer, Jens; Angerhausen, Daniel; Dannert, Felix; García Muñoz, Antonio; Quanz, Sascha P.; Absil, Olivier; Beichman, Charles A.; Girard, Julien H.; Mennesson, Bertrand; Meyer, Michael R.; Stapelfeldt, Karl R.; LIFE Collaboration (2023). "Large Interferometer for Exoplanets (LIFE). X. Detectability of currently known exoplanets and synergies with future IR/O/UV reflected-starlight imaging missions". Astronomy and Astrophysics. 678: A96. arXiv: 2308.09646 . Bibcode:2023A&A...678A..96C. doi:10.1051/0004-6361/202347027.
  4. 1 2 Houdebine, Éric R.; Mullan, D. J.; Doyle, J. G.; de la Vieuville, Geoffroy; Butler, C. J.; Paletou, F. (2019). "The Mass-Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs". The Astronomical Journal. 158 (2): 56. arXiv: 1905.07921 . Bibcode:2019AJ....158...56H. doi: 10.3847/1538-3881/ab23fe .
  5. 1 2 3 4 5 Soto, M. G.; Anglada-Escudé, G.; Dreizler, S.; Molaverdikhani, K.; Kemmer, J.; Rodríguez-López, C.; Lillo-Box, J.; Pallé, E.; Espinoza, N.; Caballero, J. A.; Quirrenbach, A.; Ribas, I.; Reiners, A.; Narita, N.; Hirano, T. (2021-05-01). "Mass and density of the transiting hot and rocky super-Earth LHS 1478 b (TOI-1640 b)". Astronomy & Astrophysics. 649: A144. arXiv: 2102.11640 . Bibcode:2021A&A...649A.144S. doi:10.1051/0004-6361/202140618. ISSN   0004-6361.
  6. ↑ "G 245-61". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 28 October 2025.
  7. ↑ "★ LHS 1478". Stellar Catalog. Retrieved 2025-10-28.
  8. 1 2 August, P. C.; Buchhave, L. A.; Diamond-Lowe, H.; Mendonça, J. M.; Gressier, A.; Rathcke, A. D.; Allen, N. H.; Fortune, M.; Jones, K. D.; Valdés, E. A. Meier; Demory, B.-O.; Espinoza, N.; Fisher, C. E.; Gibson, N. P.; Heng, K. (2025-03-01). "Hot Rocks Survey I: A possible shallow eclipse for LHS 1478 b". Astronomy & Astrophysics. 695: A171. arXiv: 2410.11048 . Bibcode:2025A&A...695A.171A. doi:10.1051/0004-6361/202452611. ISSN   0004-6361.
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