L 1159-16

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Coordinates: Sky map 02h 00m 12.959s, +13° 03′ 07.01″

L 1159-16
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
Distance14.578 ± 0.005 ly
(4.470 ± 0.001 pc)
Absolute magnitude (MV)14.03[6]
Details
Mass0.14[7] M
Radius0.161[8] R
Luminosity0.00135[9] L
Surface gravity (log g)5.05[7] cgs
Temperature3,158[8] K
Metallicity [Fe/H]−0.14[8] dex
Rotational velocity (v sin i)3.8[9] km/s
Age4.8[7] Gyr
Other designations
TZ Ari, 2MASS J02001278+1303112, GCTP 412.02, GJ 83.1, GJ 9066, G 003-033, LFT 171, LHS 11[10]
Database references
SIMBADdata
L 1159-16 is located in the constellation Aries.
L 1159-16 is located in the constellation Aries.
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]

The L 1159-16 planetary system[14]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
(unconfirmed) 4.0+1.9
−1.8
M
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