Epsilon Ursae Minoris
Eclipsing binary with RS CVn variability in Ursa Minor.
Epsilon Ursae Minoris is a binary star system in Ursa Minor, visible to the naked eye at combined magnitude 4.19. It is a detached, single-lined spectroscopic binary with a 39.5-day orbital period and low eccentricity, discovered in 1899. The system is also an eclipsing binary, with primary and secondary minima of magnitude 4.23 and 4.21. The primary is a G5 III giant, the secondary an A8-F0 V main-sequence star. One component is an RS Canum Venaticorum variable, and the system has a visual companion of magnitude 12.32 at 77.0 arcseconds.
Quick Facts
- Combined apparent visual magnitude
- 4.19
- Distance from sun
- 300 light years
- Radial velocity
- −10.57 km/s
- Orbital period
- 39.5 days
- Orbital eccentricity
- 0.04
- Primary eclipse minimum magnitude
- 4.23
- Secondary eclipse minimum magnitude
- 4.21
Facts from the source article.
More in Bright Stars by Bayer Designation: Binary and Multiple Stars
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