Astronomy:LHS 1478
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Short description: Red dwarf star in the Serpens constellation
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] mas/yr Dec.: −399.894[2] mas/yr |
| Parallax (π) | 54.9036 ± 0.0177[2] mas |
| 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 | |
| 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]
| 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
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ Carrión-González, Óscar; Kammerer, Jens; Angerhausen, Daniel; Dannert, Felix; García Muñoz, Antonio; Quanz, Sascha P.; Absil, Olivier; Beichman, Charles A. et al. (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. doi:10.1051/0004-6361/202347027. Bibcode: 2023A&A...678A..96C.
- ↑ 4.0 4.1 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. doi:10.3847/1538-3881/ab23fe. Bibcode: 2019AJ....158...56H.
- ↑ 5.0 5.1 5.2 5.3 5.4 Soto, M. G.; Anglada-Escudé, G.; Dreizler, S.; Molaverdikhani, K.; Kemmer, J.; Rodríguez-López, C.; Lillo-Box, J.; Pallé, E. et al. (2021-05-01). "Mass and density of the transiting hot and rocky super-Earth LHS 1478 b (TOI-1640 b)" (in en). Astronomy & Astrophysics 649: A144. doi:10.1051/0004-6361/202140618. ISSN 0004-6361. Bibcode: 2021A&A...649A.144S.
- ↑ "G 245-61". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=G+245-61.
- ↑ "★ LHS 1478" (in en). https://www.stellarcatalog.com/stars/lhs-1478.
- ↑ 8.0 8.1 August, P. C.; Buchhave, L. A.; Diamond-Lowe, H.; Mendonça, J. M.; Gressier, A.; Rathcke, A. D.; Allen, N. H.; Fortune, M. et al. (2025-03-01). "Hot Rocks Survey I: A possible shallow eclipse for LHS 1478 b" (in en). Astronomy & Astrophysics 695: A171. doi:10.1051/0004-6361/202452611. ISSN 0004-6361. Bibcode: 2025A&A...695A.171A.
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