SPECULOOS-3
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 49m 27.44052s |
| Declination | +33° 36′ 50.9686″ |
| Apparent magnitude (V) | 17.8 (estimate) |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | M6.5±0.5 |
| Apparent magnitude (B) | 19 |
| Apparent magnitude (R) | 16.4 |
| Apparent magnitude (G) | 15.379 |
| Apparent magnitude (J) | 11.5 |
| Apparent magnitude (H) | 10.867±0.021 |
| Apparent magnitude (K) | 10.54 |
| Astrometry | |
| Proper motion (μ) | RA: –207.809 mas/yr Dec.: –412.215 mas/yr |
| Parallax (π) | 59.7005±0.0434 mas |
| Distance | 54.63 ± 0.04 ly (16.75 ± 0.01 pc) |
| Details | |
| Mass | 0.1009±0.0024 M☉ |
| Radius | 0.123±0.0022 R☉ |
| Luminosity | 0.000835±0.000019 L☉ |
| Surface gravity (log g) | 5.265±0.014 cgs |
| Temperature | 2800±29 K |
| Metallicity [Fe/H] | 0.07±0.1 dex |
| Rotation | 1.34±0.14 d |
| Rotational velocity (v sin i) | 4.8±0.5 km/s |
| Age | 6.6+1.8 −2.4 Gyr |
| Other designations | |
| Gaia DR2 1869054868256849920, Gaia DR3 1869054868256849920, LSPM J2049+3336, TIC 230741378, 2MASS J20492745+3336512, WISE J204927.26+333646.6 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
SPECULOOS-3, also known as LSPM J2049+3336, is a red dwarf star (spectral type M6.5) located 54.6 light-years from Earth in the constellation Cygnus. It is one of the smallest known stars, and is much cooler, dimmer and smaller than the Sun, having 0.1 times the mass, 0.08% the Sun's luminosity, and an effective temperature of 2,800 K (2,530 °C), which is less than half of the Sun's temperature (5,772 K). It is orbited by one known exoplanet, and is the second ultra-cool dwarf discovered to have a planetary system, after TRAPPIST-1.