L 1159-16
Coordinates: 02h 00m 12.959s, +13° 03′ 07.01″
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aries |
Right ascension | 02h 00m 12.959s[1] |
Declination | +13° 03′ 07.01″[1] |
Apparent magnitude (V) | 12.298[2] |
Characteristics | |
Spectral type | M4.5 V[3] |
U−B color index | +1.37[4] |
B−V color index | +1.80[4] |
R−I color index | 1.39[3] |
Variable type | Flare star |
Astrometry | |
Proper motion (μ) | RA: +1092.0[1] mas/yr Dec.: –1772.9[1] mas/yr |
Parallax (π) | 223.7321 ± 0.0699[5] mas |
Distance | 14.578 ± 0.005 ly (4.470 ± 0.001 pc) |
Absolute magnitude (MV) | 14.03[6] |
Details | |
Mass | 0.14[7] M☉ |
Radius | 0.161[8] R☉ |
Luminosity | 0.00135[9] L☉ |
Surface gravity (log g) | 5.05[7] cgs |
Temperature | 3,158[8] K |
Metallicity [Fe/H] | −0.14[8] dex |
Rotational velocity (v sin i) | 3.8[9] km/s |
Age | 4.8[7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
L 1159-16 Location of L 1159-16 in the constellation Aries |
L 1159-16 is a red dwarf in the northern constellation of Aries. With a normal apparent visual magnitude of 12.3, it is too faint to be seen by the naked eye, although it lies relatively close to the Sun at a distance of about 14.6 light-years (4.5 parsecs). It is a flare star, which means it can suddenly increase in brightness for short periods of time.
Variability[]
L 1159-16 is a variable star. It is a flare star, showing brief increases in brightness due to eruptions from its surface. In the ultraviolet, flares of over a magnitude have been observed. In addition it shows longterm variations in brightness which may be due to starspots and rotation, possibly classifying it as a BY Draconis variable.[11] It was given the variable star designation TZ Arietis in 1970.[12]
Planetary system[]
In June 2019 three candidate planets were reported in orbit around L 1159-16 (GJ 83.1),[13] and two were confirmed in August 2020.[14]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
(unconfirmed) | ≥4.0+1.9 −1.8 M |