Zeta Oph
HIP 81377; Zeta Oph; 13 Oph
Star
Oph
Visible
Level 1
Naked eye / Binoculars
Physical Properties
Magnitude
2.56
Variable Type
Gamma Cassiopeiae (Eruptive Be Star)
Spectral Type
B0.5Ve
Star Color
White
(B-V 0.02)
Distance
365.9 ly
Position & Identifiers
RA
16h 37m 09.5s
Dec
-10° 34' 02.0"
Constellation
Oph
HR
6175
HIP
81377
Bayer
Zeta
Flamsteed
13 Oph
Variable ID
Zet Oph
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Visibility
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Size Comparison
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Stellar Lifecycle
Spectral Classification
Hertzsprung-Russell Diagram
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Blackbody Spectrum
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
Stellar Notes
Gamma Cas 2.56 - 2.58V. Spectrum var.: UV spectra in 1972 indicated mass outflow probably related to formation of | shell. Evidence disappeared in 1974. H alpha in absorption 1971, emission 1973. Rotational period 19.7 hrs.
Color excess E(B-V) = +0.32. Reddened star.
Runaway star from Sco OB2 association; Sco-Cen assoc.; upper Sco; exciting star of HII region S27.
Shell star. Interstellar carbon monoxide absorption. Interstellar lithium at 6708A indicates a depletion in the | Zeta Oph cloud to about one sixth solar system values. Sp. shows interstellar KI line at 4044A. In interstellar | ultraviolet radiation field.
Diam. = 0.00050 - 0.00051".
Survey Image
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