34 Cyg
HIP 100044; 34 Cyg
DoubleStar
Cyg
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
4.81
Variable Type
Ellipsoidal Variable
Spectral Type
B2pe
Star Color
Yellow-white
(B-V 0.42)
Distance
815.4 ly
Position & Identifiers
RA
20h 17m 47.2s
Dec
+38° 01' 59.0"
Constellation
Cyg
HR
7763
HIP
100044
Flamsteed
34 Cyg
Variable ID
P Cyg
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Visibility
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Multiple Star System
Separation
11.4″
Companion Mag
11.0
Position Angle
107°
Star Colors
A: Yellow-white
Discoverer
RBR 25
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 11.4″ · PA: 107° · 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
SD 3 - 6v. Since 18th century, 4.6 - 5.6v. Shell star, Nova 1600.
Cyg OB1.
Outermost shell RV varies -180 to -240k/s in period 114d. Mass loss 0.0004? solar masses/y.
Survey Image
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