Epsilon Ursae Minoris
Epoch J2000.0 Equinox J2000.0
|Right ascension||16h 45m 58.1s|
|Declination||+82° 02' 14"|
|Apparent magnitude (V)||+4.21|
|Absolute magnitude (V)||−0.922|
|Distance||303 ± 25 ly
(92.9 ± 8 pc)
The primary component, Epsilon Ursae Minoris A, is an eclipsing spectroscopic binary. It is classified as a yellow G-type giant with a mean apparent magnitude of +4.21. In addition to light changes due to eclipses, the system is also classified as an RS Canum Venaticorum type variable star and its brightness varies from magnitude +4.19 to +4.23 with a period of 39.48 days, which is also the orbital period of the binary. The binary is orbited by a third component, Epsilon Ursae Minoris B, which is an 11th magnitude star, 77 arcseconds away in the sky.
- Böhm-Vitense, Erika; et al. (December 2000), "Ultraviolet Emission Lines in BA and Non-BA Giants", The Astrophysical Journal, 545 (2): 992−999, Bibcode:2000ApJ...545..992B, doi:10.1086/317850.
- "Epsilon Ursae Minoris - Variable of RS CVn type". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 21 June 2014.
- Kaler, James B. "Epsilon Ursae Minoris". Stars. University of Illinois. Retrieved 21 June 2014.
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