Albireo — Double Star in Cygnus
HIP 95951; Beta2 Cygni; 6 Cygni
Showpiece (83/100)
Observe
1Physical Properties
Magnitude
5.11
Spectral Type
B8Ve
Star Color
Blue-white
(B-V -0.10)
Distance
192 ly
2Position & Identifiers
RA
19h 30m 45.3s
Dec
+27° 57' 55.0"
Constellation
Cygnus
(Cyg)
HR
7418
HIP
95951
HD
183914
SAO
87302
Bayer
Beta2
Flamsteed
6 Cyg
Double Cat
12540
Querying VizieR catalog...
3How easy to split?
Primary
5.1 mag
Companion
5.0 mag
Separation
34.7″
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| Telescope | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| 80 mm refractor 80mm refr. | Easy | Easy | Easy |
| 150 mm Newton 150mm Newt. | Easy | Easy | Easy |
| Celestron C8 (203 mm SCT) C8 203mm | Easy | Easy | Easy |
Easy
Medium
Hard
Very hard
Impossible
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
4Visibility
Set a location in User Settings to see visibility data.
Best season
Jun – Aug
(peak: Jul)
5Multiple Star System Triple
Components
3 (triple)
Component IDs
AB
Separation
34.7″
Companion Mag
5.0
Star Colors
A: Blue-white
B: Orange
See HR 7417. Unresolved by speckle interferometry 1981.47, sep. <0.03".
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
A: 5.1 · B: 5.0 · Sep: 34.7″ · PA: ? · N up, E right
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″
Explore
6
Size Comparison
Querying VizieR for stellar data…
7
Compare Stars
8
Spectral Classification
9
Hertzsprung-Russell Diagram
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10
Stellar Lifecycle
11
Blackbody Spectrum
12
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
13
Stellar Fusion
Discover
14Stellar Notes
0.009".
15
Light Travel Time Machine
16
Relativistic Travel
Nearby in the Sky
Other targets within a few degrees — pan your scope a little and keep exploring.
Visibility scores assume a 150 mm Newton at Bortle 4.
V473 Lyr
Pulsating variable, period 1.5d
Variable Star
mag 6.16
3.3°
Lyra
M56
NGC 6779
Globular cluster — dense ball of ancient stars
Globular Cluster
mag 8.3
3.8°
Lyra
NGC 6834
Open cluster
Open Cluster
mag 7.8
4.9°
Cygnus
13 Vul
Tight double — a rewarding split at 1.5″
Double Star
mag 4.58
6.4°
Vulpecula
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