EQ Virginis

EQ Virginis is a single variable star in the equatorial constellation of Virgo. It has a baseline visual apparent magnitude of 9.36, but is a flare star that undergoes sporadic bursts of brightening. The star is located at a distance of 67 light-years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −23 km/s. It is a member of the IC 2391 moving group of stars, which is between 30 and 50 million years old.

EQ Virginis

A light curve for EQ Virginis, plotted from Kepler data
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 13h 34m 43.2063s
Declination −08° 20 31.3353
Apparent magnitude (V) 9.36
Characteristics
Spectral type K5Ve
Variable type UV Cet + BY Dra
Astrometry
Radial velocity (Rv)−23.16±0.16 km/s
Proper motion (μ) RA: −286.577±0.110 mas/yr
Dec.: −91.866±0.083 mas/yr
Parallax (π)48.7322 ± 0.0587 mas
Distance66.93 ± 0.08 ly
(20.52 ± 0.02 pc)
Absolute magnitude (MV)10.51
Details
Mass0.68 M
Radius0.62+0.02
−0.04
 R
Luminosity0.136±0.001 L
Surface gravity (log g)4.49 cgs
Temperature4,224±80 K
Metallicity [Fe/H]−0.144 dex
Rotation3.9±0.1 days
Rotational velocity (v sin i)2.06 km/s
Age30-50 Myr
Other designations
EQ Vir, BD−07°3646, GJ 517, HD 118100, HIP 66252, SAO 139419, LTT 5253, PLX 3101, Ross 478
Database references
SIMBADdata
ARICNSdata

This is an orange-hued K-type main-sequence star with a stellar classification of K5Ve, where the 'e' suffix indicates emission lines in the spectrum. It is a young, rapidly rotating star with a mean magnetic field strength of 2,500±300 G. The star is classified as an eruptive variable of the UV Ceti type and a BY Draconis variable. It shows strong chromospheric activity with extensive star spots that, on average, cover ~24% of the surface. The star displays a strong X-ray emission.

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