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Ophiuchi - 66 Oph - HD164284 - magn.  4.6

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