TOI-2119
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 16h 17m 43.2055s |
| Declination | +26° 18′ 15.053″ |
| Apparent magnitude (V) | 12.36 |
| Characteristics | |
| Spectral type | M |
| Variable type | eclipsing binary, flare star |
| Astrometry | |
| Radial velocity (Rv) | −17.015499±0.008277 km/s |
| Proper motion (μ) | RA: −29.265±0.021 mas/yr Dec.: 6.860±0.028 mas/yr |
| Parallax (π) | 31.7652±0.0259 mas |
| Distance | 102.68 ± 0.08 ly (31.48 ± 0.03 pc) |
| Orbit | |
| Companion | TOI-2119 b |
| Period (P) | 7.2008569±0.0000003 d |
| Semi-major axis (a) | 26.7±0.1 R★ |
| Eccentricity (e) | 0.3355±0.0002 |
| Inclination (i) | 88.47±0.02° |
| Argument of periastron (ω) (secondary) | −0.94±0.09° |
| Semi-amplitude (K1) (primary) | 10.5841+7.7 −8.3 km/s |
| Details | |
| TOI-2119 | |
| Mass | 0.525+0.020 −0.021 M☉ |
| Radius | 0.500±0.015 R☉ |
| Luminosity | 0.0397+0.0013 −0.0012 L☉ |
| Surface gravity (log g) | 4.763±0.018 cgs |
| Temperature | 3621+48 −46 K |
| Metallicity [Fe/H] | +0.055+0.084 −0.077 dex |
| Rotation | 13.11±1.41 d |
| Rotational velocity (v sin i) | 1.61±0.1 km/s |
| Age | 1.17±1.15 Gyr |
| TOI-2119 b | |
| Mass | 64.4+2.3 −2.2 MJup |
| Radius | 1.08±0.03 RJup |
| Surface gravity (log g) | 5.132+0.028 −0.020 cgs |
| Temperature | 2030±84 K |
| Other designations | |
| Gaia DR2 1303675097215915264, Gaia DR3 1303675097215915264, TOI-2119, TIC 236387002, GSC 02050-00184, 2MASS J16174320+2618151, StM 274, AP J16174320+2618151, 1RXS J161742.1+261820, UCAC-2 41034926, UCAC-4 582-052494 | |
| b: TOI-2119.01 | |
| Database references | |
| SIMBAD | data |
TOI-2119 is a binary star system composed of a M-type main sequence star and a brown dwarf, discovered by the Transiting Exoplanet Survey Satellite (TESS) in 2020 and announced in 2022. It became the first example of a brown dwarf orbiting an M-dwarf to have the obliquity of the system measured using the Rossiter–McLaughlin effect.
The system is thought to be a field star, not belonging to any identified stellar association or moving group.