55 Cyg
HIP 102724; 55 Cyg
DoubleStar
Cyg
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
4.84
Variable Type
Eclipsing Binary (Algol-type)
Spectral Type
B3Ia
Star Color
Yellow-white
(B-V 0.41)
Distance
191.9 ly
Position & Identifiers
RA
20h 48m 56.3s
Dec
+46° 06' 51.0"
Constellation
Cyg
HR
7977
HIP
102724
Flamsteed
55 Cyg
Variable ID
V1661 Cyg
Double Cat
14337
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Visibility
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Multiple Star System
Separation
22.4″
Companion Mag
11.1
Position Angle
170°
Star Colors
A: Yellow-white
Discoverer
HJ 1581
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 22.4″ · PA: 170° · 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
Alpha Cyg 4.81 - 4.87V, no clear periodicity. Small variations in polarization have been observed, 2.0 to 2.6%.
Optical.
NGC 457. Cyg OB7.
4-5d inside atmospheric motion 15-16d. RV results confirmed by H alpha profiles.
Survey Image
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