Upsilon Cyg
HIP 105138; Upsilon Cyg; 66 Cyg
DoubleStar
Cyg
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
4.43
Spectral Type
B2Vne
Star Color
Blue-white
(B-V -0.11)
Distance
171.7 ly
Position & Identifiers
RA
21h 17m 55.1s
Dec
+34° 53' 49.0"
Constellation
Cyg
HR
8146
HIP
105138
Bayer
Upsilon
Flamsteed
66 Cyg
Variable ID
Ups Cyg
Double Cat
14831
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Visibility
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Multiple Star System
Components
3
Component IDs
AB
Separation
15.2″
Companion Mag
10.8
Position Angle
219°
Star Colors
A: Blue-white
Discoverer
STT 433
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 15.2″ · PA: 219° · N up, E left
Resolved · 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
4.28 - 4.50V.
AB CPM; 79000?y. Component B, 10.0v G8.5V, probably optical.
ADS 14831A. Expanding circumstellar shell.
Cyg OB4.
Survey Image
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