Albireo
HIP 95947; Beta1 Cyg; 6 Cyg
Observable Double Star
Showpiece (78/100)
Sep: 34.5", Companion: mag 4.7
HIP 95947; Beta1 Cyg; 6 Cyg
DoubleStar
Cyg
Visible
Level 2
Small telescope (4") - Requires steady seeing
Physical Properties
Magnitude
3.08
Spectral Type
K2II
Star Color
Orange
(B-V 1.13)
Distance
433.3 ly
Position & Identifiers
RA
19h 30m 43.3s
Dec
+27° 57' 35.0"
Constellation
Cyg
HR
7417
HIP
95947
Bayer
Beta1
Flamsteed
6 Cyg
Double Cat
12540
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Visibility
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Multiple Star System
Components
3
Component IDs
AB
Separation
34.5″
Companion Mag
4.7
Companion Sp
B9.5
Position Angle
53°
Star Colors
A: Orange
B: Blue-white
Discoverer
STFA 43
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 34.5″ · PA: 53° · 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
7270.2y, a = 62.90". Binary with HR 7418. vsini of B-type component of ADS 12540A 50:k/s. Component C, 11v at 50". | Two additional components of A resolved by speckle interferometry: Aa 1981.70, sep. 0.42"; Ap 1978.41, sep. 0.12" and | 1979.46, sep. <0.08".
0.009".
ALBIREO.
Survey Image
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