Pi Cyg
HIP 107533; Pi Cyg; 81 Cyg
HIP 107533; Pi Cyg; 81 Cyg
DoubleStar
Cyg
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
4.23
Spectral Type
B3III
Star Color
Blue-white
(B-V -0.12)
Position & Identifiers
RA
21h 46m 47.6s
Dec
+49° 18' 34.0"
Constellation
Cyg
HR
8335
HIP
107533
Bayer
Pi
Flamsteed
81 Cyg
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Visibility
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Multiple Star System
Separation
0.1″
Companion Mag
6.0
Position Angle
131°
Star Colors
A: Blue-white
Discoverer
MIU 3
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.1″ · PA: 131° · 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
72.0162d, K 7.8k/s, V0 -12.3k/s, asini 7.26.
Cyg OB7.
Survey Image
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