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Zeta Ophiuchi

13 Ophiuchi

Blue-white Star in Ophiuchus

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Proper Name	None
Bayer Designation	Zeta Ophiuchi
Flamsteed Number	13 Ophiuchi
HR (BSC)	6175
HD	149757
Constellation	Ophiuchus
Right Ascension	16h 37m 10s
Declination	-10° 34' 2"
Distance	366 light years 112 parsecs
Magnitude	Apparent: +2.6 Absolute: -2.7
Spectral Class	O9.5Vn Blue-white main sequence star
Optimum Visibility	June
Notes	Zeta Ophiuchi is a hot O-type main sequence star, estimated to be some eight times the diameter of the Sun. It lies within a tenuous cloud of gas and dust, which absorbs much of the light emitted by Zeta Ophiuchi and is faintly illuminated by the star's light.

A dwarf star more than 360 light years from Earth. It is notable as belonging to the O-type classification, meaning that it is hot even by stellar standards. Its surface temperature is more than 25,000 Kelvin, making it about five times hotter than the Sun.

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