Sigma Aql
Observable Variable Star
Excellent (63/100)
Range: 5.2 - 5.4, Period: 2.0d, Type: EB
HIP 96665; Sigma Aql; 44 Aql
VariableStar
Aql
Visible
Level 3
Medium telescope (6-8") - Monitor brightness changes
Physical Properties
Magnitude
5.17
Variable Type
Eclipsing Binary (Beta Lyrae-type)
Spectral Type
B3V+B3V
Star Color
White
(B-V 0.03)
Position & Identifiers
RA
19h 39m 11.6s
Dec
+05° 23' 52.0"
Constellation
Aql
HR
7474
HIP
96665
Bayer
Sigma
Flamsteed
44 Aql
Variable ID
Sig Aql
Double Cat
12737
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Visibility
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Comparison Stars for Sigma Aql (5.2–5.4)
Nearby stable stars for estimating brightness (AAVSO)
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Multiple Star System
Components
3
Component IDs
AB
Separation
48.0″
Companion Mag
12.3
Companion Sp
B3V
Position Angle
327°
Star Colors
A: White
B: Blue
Discoverer
HJ 2886
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 48.0″ · PA: 327° · 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 12737A, EB 5.18 - 5.36B, 1.95026827d. i 71.7d. Spectra vary in period 1.950271d.
B, 12v K0Ve at 48" optical. C, 12v at 130". Rotational velocity of A 123k/s, of B 142k/s.
ADS 12737A, 1.950271d, K 164.2k/s, V0 -4.5k/s, msin3i 5.84, asini 4.40. vsini of secondary 129k/s.
Survey Image
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