LHS 1678
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Caelum |
| Right ascension | 04h 32m 42.635s |
| Declination | −39° 47′ 12.15″ |
| Apparent magnitude (V) | 12.482 |
| Characteristics | |
| A | |
| Evolutionary stage | Red dwarf |
| Spectral type | M2V |
| Apparent magnitude (B) | 13.5 |
| Apparent magnitude (R) | 11.533 |
| Apparent magnitude (G) | 9.02 |
| Apparent magnitude (H) | 8.501 |
| Apparent magnitude (K) | 8.264 |
| B−V color index | 1.018 |
| B | |
| Evolutionary stage | Possible brown dwarf, maybe a jovian planet |
| Astrometry | |
| Radial velocity (Rv) | 10.94±0.28 km/s |
| Total velocity | 94.6±0.4 km/s |
| Proper motion (μ) | RA: +239.368 mas/yr Dec.: −967.597 mas/yr |
| Parallax (π) | 50.34±0.02 mas |
| Distance | 64.79 ± 0.03 ly (19.865 ± 0.008 pc) |
| Orbit | |
| Primary | A |
| Companion | B |
| Period (P) | 42 or 100 years |
| Semi-major axis (a) | 17 or 100 mas (36 or 210 AU) |
| Details | |
| A | |
| Mass | 0.345±0.014 M☉ |
| Radius | 0.329±0.01 R☉ |
| Luminosity | 0.0145±0.0003 L☉ |
| Temperature | 3490±50 K |
| Metallicity [Fe/H] | −0.36±0.06 dex |
| Rotation | 66±22 d |
| Age | 4.22±0.87 or 4–9 Gyr |
| Other designations | |
| TOI-696, Gaia DR2 4864160624337973248, Gaia DR3 4864160624337973248, LHS 1678, LTT 2022, TIC 77156829, 2MASS J04324261-3947112, WISEA J043242.84-394722.1 | |
| Database references | |
| SIMBAD | data |
LHS 1678 (TOI-696) is an astrometric binary star system, located about 65 light-years from the Earth in the constellation Caelum. It is made up of a red dwarf and a companion star whose nature is still uncertain, but is likely to be a brown dwarf. The red dwarf star is known to host three small, close-in exoplanets. The apparent magnitude of LHS 1678 is 12.5, which is too dim to be seen with the naked eye or a small telescope.