51 Cyg
HIP 102177; 51 Cyg
DoubleStar
Cyg
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
5.39
Spectral Type
B2V
Star Color
Blue-white
(B-V -0.10)
Position & Identifiers
RA
20h 42m 12.6s
Dec
+50° 20' 24.0"
Constellation
Cyg
HR
7929
HIP
102177
Flamsteed
51 Cyg
Double Cat
14189
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Visibility
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Multiple Star System
Components
5
Component IDs
AB
Separation
3.3″
Companion Mag
12.4
Position Angle
102°
Star Colors
A: Blue-white
Discoverer
BU 675
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 3.3″ · PA: 102° · 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
AB fixed.
Survey Image
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