EQ Virginis

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EQ Virginis
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 13h 34m 43.207s[1]
Declination −08° 20′ 31.34″[1]
Apparent magnitude (V) 9.31
Characteristics
Spectral type K5Ve
U−B color index  ?
B−V color index  ?
Variable type Flare
Astrometry
Radial velocity (Rv) −22.42 ± 0.14 km/s
Proper motion (μ) RA: −285.90 ± 0.70[1] mas/yr
Dec.: −92.13 ± 0.38[1] mas/yr
Parallax (π) 49.48 ± 0.72[1] mas
Distance 65.9 ± 1.0 ly
(20.2 ± 0.3 pc)
Absolute magnitude (MV) 10.51
Details
Mass M
Radius R
Luminosity L
Temperature 4224 ± 80[2] K
Metallicity -0.150
Rotation ?
Age 30-50 million years[3] years
Other designations
V* EQ Vir, GJ 517, PLX 3101, BD−07° 3646, HD 118100, SAO 139419, 1E 1332.1-0804, HERZ 13903, RBS 1287, HIP 66252, LTT 5253, Ross 478.

EQ Virginis is a flare star in the constellation of Virgo. It is an orange dwarf of spectral type K5Ve and is a member of a IC 2391 moving group.[4] The moving group of stars is between 30 and 50 million years old.[3]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy & Astrophysics 530 (A138): 21. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276. 
  3. ^ a b Paulson, Diane B.; Yelda, Sylvana (2006). "Differential Radial Velocities and Stellar Parameters of Nearby Young Stars". Bibcode:2006PASP..118..706P. doi:10.1086/504115. 
  4. ^ Montes, D.; López-Santiago, J.; Gálvez, M. C.; Fernández-Figueroa, M. J.; De Castro, E.; Cornide, M. (2001). "Late-type members of young stellar kinematic groups - I. Single stars". Monthly Notices of the Royal Astronomical Society 328 (1): 45–63. Bibcode:2001MNRAS.328...45M. doi:10.1046/j.1365-8711.2001.04781.x.