Tau Cyg
HIP 104887; Tau Cyg; 65 Cyg
DoubleStar
Cyg
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
3.72
Variable Type
Delta Scuti (Pulsating)
Spectral Type
F1 IV
Star Color
Yellow-white
(B-V 0.39)
Distance
66.3 ly
Position & Identifiers
RA
21h 14m 47.5s
Dec
+38° 02' 44.0"
Constellation
Cyg
HR
8130
HIP
104887
Bayer
Tau
Flamsteed
65 Cyg
Variable ID
Tau Cyg
Double Cat
14787
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Visibility
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Multiple Star System
Components
7
Component IDs
AB
Separation
0.9″
Companion Mag
6.6
Companion Sp
F7V
Position Angle
170°
Star Colors
A: Yellow-white
B: Yellow
Discoverer
AGC 13
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.9″ · PA: 170° · 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
Delta Sct 3.65 - 3.84V. 2-3 hrs.? Possibly variable period.
AB 3.82 F0IV, 6.42 G1V, 49.80y, a = 0.85". Components C, 13v at 29" and P, 12v at 72", both optical. Q, 12v at 90", | physical. R, 13v at 90", CPM.
0.143d not confirmed.
Color excess E(B-V) = +0.09.
0.046".
Survey Image
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