Iota Boötis

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ι Boötis
Observation data
Epoch J2000.0
Constellation
(pronunciation)		 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
Asellus Secondus, 21 Boötis, HR 5350, HD 125161, Wo 9474, BD+52°1784, FK5 528, HIP 69713, SAO 29071, GC 19269, ADS 9198, CCDM 14162+5122

Iota Boötis (ι Boo / ι Boötis) is a star system in the constellation Boötes. It also has the traditional name Asellus Secundus (Latin for "second donkey colt") 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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