30 Cyg
Observable Double Star
Good (54/100)
Sep: 337.5", Companion: mag 7.0
HIP 99639; 30 Cyg
DoubleStar
Cyg
Visible
Level 2
Small telescope (4") - Requires steady seeing
Physical Properties
Magnitude
4.83
Variable Type
Delta Scuti (Pulsating)
Spectral Type
A5IIIn
Star Color
White
(B-V 0.09)
Distance
271.8 ly
Position & Identifiers
RA
20h 13m 18.0s
Dec
+46° 48' 57.0"
Constellation
Cyg
HR
7730
HIP
99639
Flamsteed
30 Cyg
Double Cat
13554
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Visibility
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Multiple Star System
Components
6
Component IDs
AD
Separation
337.5″
Companion Mag
7.0
Star Colors
A: White
B: Red
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
Delta Sct?
Component D of ADS 13554 of which primary is HR 7735.
There is very much confusion in the literature as to which of the three stars HR 7730, 7735, 7751 should be called | Omicron1 and which Omricron2: | HR FL SOME BAC Others | 7730 30 Omicron1 Omicron1 - | 7735 31 Omicron2 Omicron2 Omicron1 | 7751 32 - Omicron3 Omicron2 | For these stars, the Greek letter is hence omitted from the Name column.
Survey Image
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