28 Cyg
HIP 99303; 28 Cyg
DoubleStar
Cyg
Visible
Level 2
Small telescope (4") - Requires steady seeing
Physical Properties
Magnitude
4.93
Range
4.85 - 4.99
Period
16.8 hours
Variable Type
SX Arietis (Magnetic Rotating)
Spectral Type
B2.5Ve
Star Color
Blue-white
(B-V -0.13)
Position & Identifiers
RA
20h 09m 25.6s
Dec
+36° 50' 23.0"
Constellation
Cyg
HR
7708
HIP
99303
Flamsteed
28 Cyg
Variable ID
V1624 Cyg
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Visibility
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Light Curve
Multiple Star System
Separation
81.9″
Companion Mag
9.4
Companion Sp
sdO
Position Angle
124°
Star Colors
A: Blue-white
B: Blue-white
Discoverer
BNW 2
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 81.9″ · PA: 124° · 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 Fusion
Stellar Notes
SX Ari 4.91 - 4.97V, 0.07d. Possibly also Gamma Cas type. H-line widths vary in cycles about 15 yrs.
226.0d. Also RV periods 45.33 and 1.51775d.
In 1957 B type changed to Be.
Survey Image
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