LHS 3844 is a red dwarf star located 48.5 light-years (14.9 parsecs) away from the Solar System in the constellation of Indus. The star has about 15% the mass and 19% the radius of the Sun.[3] It is a relatively inactive red dwarf with a slow rotation period of about 128 days, though UV flares have been observed.[6] LHS 3844 is orbited by one known exoplanet.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Indus[1] |
| Right ascension | 22h 41m 58.11718s[2] |
| Declination | −69° 10′ 08.3207″[2] |
| Apparent magnitude (V) | 15.26±0.03[3] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | M4.5-M5[3] |
| Apparent magnitude (V) | 15.26±0.03[3] |
| Apparent magnitude (G) | 13.365±0.003[2] |
| Apparent magnitude (J) | 10.046±0.023[3] |
| Apparent magnitude (H) | 9.477±0.023[3] |
| Apparent magnitude (K) | 9.145±0.023[3] |
| Astrometry | |
| Radial velocity (Rv) | −9.90±0.76[2] km/s |
| Proper motion (μ) | RA: 334.419 mas/yr[2] Dec.: −726.986 mas/yr[2] |
| Parallax (π) | 67.2123 ± 0.0187 mas[2] |
| Distance | 48.53 ± 0.01 ly (14.878 ± 0.004 pc) |
| Absolute magnitude (MV) | 14.39±0.02[3] |
| Details[3] | |
| Mass | 0.151±0.014 M☉ |
| Radius | 0.189±0.006 R☉ |
| Luminosity (bolometric) | 0.00272±0.0004 L☉ |
| Surface gravity (log g) | 5.06±0.01 cgs |
| Temperature | 3036±77 K |
| Rotation | 128±24 d |
| Age | 7.8±1.6[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Nomenclature
The designation LHS 3844 comes from one of Luyten's catalogues 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.[7] The approved names, proposed by a team from Costa Rica, were announced in June 2023. LHS 3844 is named Batsũ̀ and its planet is named Kua'kua, after the Bribri words for "hummingbird" and "butterfly".[8]
Planetary system
The exoplanet LHS 3844 b was discovered in 2018 using TESS.[3] It is a terrestrial planet larger than Earth with an orbital period of less than a day, and likely does not have an atmosphere. Its low albedo suggests that its surface may resemble that of the Moon or Mercury.[9][10]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Kua'kua | ~2.25 M🜨 | 0.00622±0.00017 | 0.46292913±0.0000019 | — | 88.50±0.51° | 1.303±0.022 R🜨 |