V538 Aurigae

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V538 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 41m 20.3357s
Declination +53° 28′ 51.808″
Apparent magnitude (V) 6.23
Spectral type K1 V
U−B color index 0.51
B−V color index 0.84
R−I color index 0.29
Variable type BY Draconis variable
Radial velocity (Rv) 1.7 km/s
Proper motion (μ) RA: 2.7 mas/yr
Dec.: -523.61 mas/yr
Parallax (π) 81.69 ± 0.83 mas
Distance 39.9 ± 0.4 ly
(12.2 ± 0.1 pc)
Absolute magnitude (MV) 7.07
Metallicity [Fe/H] +0.16[1] dex
Rotation 11 days[1]
Age 4–8 × 108[2] years
Other designations
BD+53° 934, HD 37394, HIP 26779, HR 1925, NSV 16618.
Database references
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

V538 Aurigae is a star in the northern constellation of Auriga. With an apparent visual magnitude of 6.23, this star requires good dark sky conditions to view with the naked eye. It is located at a distance of 39.9 light-years (12.2 parsecs) from Earth.

This is a BY Draconis variable, which means it undergoes changes in luminosity because regions of pronounced surface magnetic activity are moved into and out of the line of sight from the Earth as the star rotates (once every 11 days).[1] It has a spectral class of K1 V, indicating that it is a K-type main sequence star.


  1. ^ a b c Maldonado, J. et al. (October 2010), "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups", Astronomy and Astrophysics 521: A12, arXiv:1007.1132, Bibcode:2010A&A...521A..12M, doi:10.1051/0004-6361/201014948 
  2. ^ Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008), "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics", The Astrophysical Journal 687 (2): 1264–1293, arXiv:0807.1686, Bibcode:2008ApJ...687.1264M, doi:10.1086/591785 

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