Mu Cyg
Mu Cyg (BS8309)
Observable Double Star
Fair (28/100)
Sep: 1.6", Companion: mag 6.2
HIP 107310; Mu Cyg; 78 Cyg
DoubleStar
Cyg
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
4.73
Spectral Type
F6V
Star Color
Yellow
(B-V 0.48)
Distance
66.6 ly
Position & Identifiers
RA
21h 44m 08.6s
Dec
+28° 44' 34.0"
Constellation
Cyg
HR
8309
HIP
107310
Bayer
Mu
Flamsteed
78 Cyg
Double Cat
15270
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Visibility
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Multiple Star System
Components
5
Component IDs
AB
Separation
1.6″
Companion Mag
6.2
Companion Sp
G2V
Position Angle
325°
Star Colors
A: Yellow
B: Yellow
Discoverer
STF2822
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 1.6″ · PA: 325° · 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 4.78 F4V, 6.09 G2V, 507.5y, a = 4.278". B is HR 8310. Combined colors. Mag. for blend 4.50V. Components C, D, | optical. D, at 201" is ADS 15275, 6.9 A5, 13.3v sep. 16".
0.052".
Survey Image
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