LHS 1678

LHS 1678
Observation data
Epoch J2000      Equinox J2000
Constellation Caelum[a]
Right ascension 04h 32m 42.635s[2]
Declination −39° 47′ 12.15″[2]
Apparent magnitude (V) 12.482[1]
Characteristics
A
Evolutionary stage Red dwarf
Spectral type M2V[3]
Apparent magnitude (B) 13.5[1]
Apparent magnitude (R) 11.533[1]
Apparent magnitude (G) 9.02[1]
Apparent magnitude (H) 8.501[1]
Apparent magnitude (K) 8.264[1]
B−V color index 1.018[1]
B
Evolutionary stage Possible brown dwarf, maybe a jovian planet[3]
Astrometry
Radial velocity (Rv)10.94±0.28[2] km/s
Total velocity94.6±0.4[3] km/s
Proper motion (μ) RA: +239.368 mas/yr[2]
Dec.: −967.597 mas/yr[2]
Parallax (π)50.34 ± 0.02 mas[2]
Distance64.79 ± 0.03 ly
(19.865 ± 0.008 pc)[2]
Orbit[3]
PrimaryA
CompanionB
Period (P)42 or 100 years
Semi-major axis (a)17 or 100 mas
(36 or 210 AU)[b]
Details[3]
A
Mass0.345±0.014 M☉
Radius0.329±0.01 R☉
Luminosity0.0145±0.0003 L☉
Temperature3490±50 K
Metallicity [Fe/H]−0.36±0.06 dex
Rotation66±22 d
Age4.22±0.87[4] 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
SIMBADdata

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.[3] The red dwarf star is known to host three small, close-in exoplanets.[5] The apparent magnitude of LHS 1678 is 12.5, which is too dim to be seen with the naked eye or a small telescope.[6]

  1. ^ a b c d e f g h Cite error: The named reference simbad was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference gaia was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Silverstein2022 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Engle was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Silverstein2024 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference stellar was invoked but never defined (see the help page).


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