| 68 Ophiuchi, Upsilon Ophiuchi|66 Ophiuchi Wikipedia
66 Ophiuchi is a class B2Ve (blue main-sequence) star in the constellation Ophiuchus. Its apparent magnitude is 4.60 and it is approximately 650 light years away based on parallax.
It is a γ Cas variable, a shell star with a circumstellar disc of gas and irregular changes in brightness, ranging from 4.85 to 4.55 magnitude. A companion at separation 0.1" and magnitude 6.5 has been reported.