| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra[note 1] |
| Right ascension | 08h 53m 36.16047s[2] |
| Declination | −03° 29′ 32.1975″[2] |
| Apparent magnitude (V) | +18.959[3] |
| Characteristics | |
| Evolutionary stage | Ultracool dwarf[4][5] |
| Spectral type | M9V[4] |
| Variable type | Flare star[5] |
| Astrometry | |
| Radial velocity (Rv) | 7±2[3] km/s |
| Proper motion (μ) | RA: −516.605mas/yr[2] Dec.: −199.652mas/yr[2] |
| Parallax (π) | 115.4876±0.0726 mas[2] |
| Distance | 28.24 ± 0.02 ly (8.659 ± 0.005 pc) |
| Details | |
| Mass | 0.082±0.002[6] M☉ |
| Radius | 0.113±0.006[6] R☉ |
| Luminosity | 3.39+0.16 −0.15×10−4[7] L☉ |
| Surface gravity (log g) | ~5.5[7] cgs |
| Temperature | 2,317+61 −56[6] K |
| Age | >0.5[5] Gyr |
| Other designations | |
| GJ 3517,LHS 2065,LP 666-9,TIC 7975441,2MASS J08533619-0329321 | |
| Database references | |
| SIMBAD | data |
LHS 2065 is ared dwarf star,one of the smallest stars ever found with around 8.2% themass of the Sun and a diameter only 10% greater than Jupiter.[6] It is one of the fewultracool dwarfs known to haveflare activity, emitting one flare every 33 hours,[5] and is also an active X-ray emitter.[4]
Parallax measurements by the Gaia spacecraft give a distance of 8.66 parsecs (28.2 ly) to LHS 2065.[2] This star was first recorded by theLuyten Half-Second catalogue, a catalogue of stars with proper motions exceeding 0.5". The star's main identifier is named after this catalogue.[8] It is located in theHydra constellation.[note 1]
This star has aspectral type of M9V,[4] indicating a very cool star at the end of themain sequence. It is among the nearest ultracool dwarfs to Earth.[5] LHS 2065 has an effective temperature of around 2,317 K,[6] 2.5 times less than the Sun. The lack of lithium in thestar's atmosphere indicate that it must be over 500 million years old.[5]
