Lambda Cyg
HIP 102589; Lambda Cyg; 54 Cyg
DoubleStar
Cyg
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
4.53
Spectral Type
B5Ve
Star Color
Blue-white
(B-V -0.11)
Distance
407.7 ly
Position & Identifiers
RA
20h 47m 24.5s
Dec
+36° 29' 27.0"
Constellation
Cyg
HR
7963
HIP
102589
Bayer
Lambda
Flamsteed
54 Cyg
Double Cat
14296
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Visibility
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Multiple Star System
Components
3
Component IDs
AB
Separation
1.0″
Companion Mag
6.3
Position Angle
359°
Star Colors
A: Blue-white
B: White
Discoverer
STT 413
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 1.0″ · PA: 359° · 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 4.85 B5V, 6.07 B7V, 391.30y, a = 0.777". Combined colors. Mag. of blend 4.52V. Component C, 9v K2III-IV at 84", | optical; vsini =<54k/s. Resolved by speckle interferometry 1986.45, sep. 0.87".
ADS 14296A. Resolved by speckle interferometry 1986.45, sep. 0.05".
Shell star.
0.006".
Survey Image
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