LP 71-82

An R band light curve for LP 71-82 showing flares, adapted from Baran et al. (2013)[1]
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Draco
Right ascension	18h 02m 16.60s
Declination	64° 15′ 44.6″
Apparent magnitude (V)	13.51[1]
Characteristics
Spectral type	M5.0V
Apparent magnitude (J)	8.54[2]
Astrometry
Proper motion (μ)	RA: 196.394 mas/yr[3] Dec.: -383.789 mas/yr[3]
Parallax (π)	128.3057±0.0319 mas[3]
Distance	25.420 ± 0.006 ly (7.794 ± 0.002 pc)
Details[4]
Mass	0.16±0.01 M☉
Radius	0.195±0.002 R☉
Luminosity	0.0033±0.0003 L☉
Habitable zone inner limit	0.06
Habitable zone outer limit	0.12
Surface gravity (log g)	4.5[5] cgs
Temperature	3124±51 K
Rotation	0.28018±0.000010 d
Rotational velocity (v sin i)	11.3±1.5 km/s
Age	0.5+1.1 −0.34 Gyr
Other designations
G 227-22, LP 71-82, LSPM J1802+6415, NLTT 45873, GSC 04209-01465, 2MASS J18021660+6415445, Gaia DR2 2161121135533953536
Database references
SIMBAD	data

LP 71-82 is a red dwarf star, located in constellation Draco at 25.42 light-years (7.79 parsecs) from Earth.^[3] Kinematically, it is probably belongs to the Ursa Major Moving Group.^[6]

LP 71-82 is a flare star with a very strong activity,^[1] with at least four flares detected by 2019.^[5] Such activity is expected for a star with a short rotational period of just 6 hours. As a low mass star, it is fully convective. It is visible nearly pole-on, with rotational axis deflected from the Sun by 19±3° degrees.^[4] The star has a magnetic fields in chromosphere in 3.8-4.7 kilogauss range.^[7]

Multiplicity surveys did not find any stellar companions to LP 71-82 as in 2014.^[8]

References

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