V389 Cyg
Observable Double Star
Good (58/100)
Sep: 3.3", Companion: mag 8.1
Observable Variable Star
Range: 5.5 - 5.7, Period: 1.2d
HIP 104371
DoubleStar
Cyg
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
5.59
Spectral Type
B9VpSi
Star Color
Blue-white
(B-V -0.10)
Position & Identifiers
RA
21h 08m 38.9s
Dec
+30° 12' 21.0"
Constellation
Cyg
HR
8094
HIP
104371
Variable ID
V389 Cyg
Double Cat
14682
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Visibility
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Comparison Stars for V389 Cyg (5.5–5.7)
Nearby stable stars for estimating brightness (AAVSO)
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Multiple Star System
Components
4
Component IDs
AB
Separation
3.3″
Companion Mag
8.1
Position Angle
303°
Star Colors
A: Blue-white
B: Yellow-white
Discoverer
STF2762
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 3.3″ · PA: 303° · 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
ADS 14682A, 5.55 - 5.71V. Alternating periods of 1.12912 and 1.19328d. V 389 Cyg may be triple star, with long period | about 150d, perhaps 110 or 270d.
AB binary. B, 7.8v A0V or Am(A2.5/A7V/A9), vsini 80k/s. C, 9.2v K1III at 58" optical, vsini =<54k/s.
ADS 14682A, 3.3132d, K 20.2k/s, V0 -22.1k/s, asini 0.920. Also about 150d, possibly 110 or 270d.
0.008".
Survey Image
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