Tau Oph
HIP 88404; Tau Oph; 69 Oph
Observable Double Star
Fair (29/100)
Sep: 1.4", Companion: mag 5.9
HIP 88404; Tau Oph; 69 Oph
DoubleStar
Oph
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
5.24
Spectral Type
F2V
Star Color
Yellow-white
(B-V 0.38)
Distance
56.2 ly
Position & Identifiers
RA
18h 03m 04.9s
Dec
-08° 10' 50.0"
Constellation
Oph
HR
6734
HIP
88404
Bayer
Tau
Flamsteed
69 Oph
Double Cat
11005
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Visibility
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Multiple Star System
Components
3
Component IDs
AB
Separation
1.4″
Companion Mag
5.9
Companion Sp
F5V
Position Angle
292°
Star Colors
A: Yellow-white
B: Yellow-white
Discoverer
STF2262
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 1.4″ · PA: 292° · N up, E left
Unresolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″
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
AB 5.24 F2, 5.94 F3, 280.03y, a = 1.494". Component B is HR 6733. Color for combined light. Spectrum for combined | light, F4IV. C, 11.28V, +0.78(B-V), +0.33(U-B) at 100", optical?
ADS 11005A.
Blended spectra with HR 6733 range from F3 to F5, luminosity III to V.
0.021".
Survey Image
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