Iota Boötis
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| Observation data Equinox J2000.0 |
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|---|---|
| Constellation | Boötes |
| Right ascension | 14h 16m 09.9s |
| Declination | +51° 22' 02" |
| Apparent magnitude (V) | +4.75 |
| Distance | 97.2 ± 1.6 ly (29.8 ± 0.5 pc) |
| Spectral type | A9V+A2 |
| Other designations | |
Iota Boötis (ι Boo / ι Boötis) is a star system in the constellation Boötes. It also has the traditional name Asellus Secundus and the Flamsteed designation 21 Boötis. Iota Boötis is a double star, with components at an angular distance of 38.6 arcseconds, easily separated with binoculars. It is approximately 97 light years from Earth.
The primary component, Iota Boötis A, a spectroscopic binary, is white A-type main sequence dwarf with a mean apparent magnitude of +4.75. It is classified as a Delta Scuti type variable star and its brightness varies from magnitude +4.73 to +4.78. The companion, Iota Boötis B, is a magnitude +8.27 star belonging to spectral class A2.
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