Kappa Boötis
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| Observation data Equinox J2000.0 |
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|---|---|
| Constellation | Boötes |
| Right ascension | 14h 13m 27.7s |
| Declination | +51° 47' 16" |
| Apparent magnitude (V) | +4.53, +6.62 |
| Distance | 155 ± 6 ly (48 ± 2 pc) |
| Spectral type | A8IV+F1V |
| Other designations | |
Kappa Boötis (κ Boo / κ Boötis) is a star system in the constellation Boötes. It also has the traditional name Asellus Tertius and the Flamsteed designation 17 Boötis. Kappa Boötis is approximately 155 light years from Earth.
Kappa Boötis is a double star viewable in small telescope, with components separated by an angular distance of 13.4 arcseconds. The primary star, κ² Boötis, has apparent magnitude +4.54 and spectral class A8IV. It is classified as a Delta Scuti type variable star and its brightness varies from magnitude +4.50 to +4.58 with a period of 1.83 hours. The companion star, κ¹ Boötis, has magnitude +6.58 and spectral class F1V.
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