Star in the constellation Boötes
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! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000      Equinox J2000
! style="text-align:left" | Constellation
! style="text-align:left" | Right ascension
! style="text-align:left" | Declination
! style="text-align:left" | Apparent magnitude (V)
! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics
! style="text-align:left" | Spectral type
! style="text-align:left" | U−B 
! style="text-align:left" | B−V 
! style="text-align:left" | Variable type
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HD 126009 or CI Boötis is a variable star in the northern constellation of Boötes. With an apparent magnitude of 6.6, it would be extremely difficult to see with the naked eye even under the very best observing conditions, but can easily be seen with binoculars.
The German astronomer Wolfgang Strohmeier announced that HD 126009 is a variable star in 1960. It was given its variable star designation, CI Boötis, in 1978.
References.
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