Epsilon Coronae Borealis
Binary star system with a giant primary and an exoplanet.
Epsilon Coronae Borealis is a binary star system in the northern constellation Corona Borealis, visible to the unaided eye at a combined apparent magnitude of 4.13. It lies about 242 light-years from the Sun and is drifting closer at a velocity of −32 km/s. The primary is a K2III giant star, 70% more massive than the Sun, that has expanded to nearly 24 solar radii and shines with 194 times the Sun's luminosity. A companion orange dwarf orbits at 135 astronomical units with a period of 900 years. Radial velocity observations over seven years indicate an exoplanet at least 6.7 times Jupiter's mass orbiting at 1.3 astronomical units every 418 days.
Quick Facts
- Apparent magnitude
- 4.13
- Distance
- 242 ly
- Radial velocity
- −32 km/s
- Primary spectral type
- K2III
- Companion spectral type
- K3V to K9V
- Companion orbital distance
- 135 AU
- Companion orbital period
- 900 years
- Exoplanet orbital distance
- 1.3 AU
Facts from the source article.
More in Bright Stars by Bayer Designation: Binary and Multiple Stars
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