47 Cyg
HIP 101474; 47 Cyg
DoubleStar
Cyg
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
4.61
Spectral Type
K2Ib+B3V
Star Color
Red
(B-V 1.60)
Distance
1630.8 ly
Position & Identifiers
RA
20h 33m 54.2s
Dec
+35° 15' 03.0"
Constellation
Cyg
HR
7866
HIP
101474
Flamsteed
47 Cyg
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Visibility
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Multiple Star System
Components
3
Component IDs
AC
Separation
0.3″
Companion Mag
7.3
Companion Sp
B3V
Position Angle
278°
Star Colors
A: Red
B: Blue
Discoverer
WRH 34
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.3″ · PA: 278° · 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 sep. 0.1", no magnitudes cited. Both 2 micron IR and UV sources.
88.495d, K 20.6k/s, V0 +1.3k/s, asini 17.9. vsini of K2 component =<50k/s, of B3 component <25k/s.
Survey Image
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