EQ Virginis
| 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 |
| Distance | 66.93 ± 0.08 ly (20.52 ± 0.02 pc) |
| Absolute magnitude (MV) | 10.51 |
| Details | |
| Mass | 0.68 M☉ |
| Radius | 0.62+0.02 −0.04 R☉ |
| Luminosity | 0.136±0.001 L☉ |
| Surface gravity (log g) | 4.49 cgs |
| Temperature | 4,224±80 K |
| Metallicity [Fe/H] | −0.144 dex |
| Rotation | 3.9±0.1 days |
| Rotational velocity (v sin i) | 2.06 km/s |
| Age | 30-50 Myr |
| Other designations | |
| EQ Vir, BD−07°3646, GJ 517, HD 118100, HIP 66252, SAO 139419, LTT 5253, PLX 3101, Ross 478 | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
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.
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.