Theta Sge
HIP 99352; Theta Sge; 17 Sge
DoubleStar
Sge
Visible
Level 2
Small telescope (4") - Requires steady seeing
Physical Properties
Magnitude
6.48
Spectral Type
F5IV
Star Color
Yellow-white
(B-V 0.38)
Distance
112.5 ly
Position & Identifiers
RA
20h 09m 56.6s
Dec
+20° 54' 55.0"
Constellation
Sge
HR
7705
HIP
99352
Bayer
Theta
Flamsteed
17 Sge
Double Cat
13442
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Visibility
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Multiple Star System
Components
4
Component IDs
AC
Separation
11.6″
Companion Mag
8.8
Companion Sp
F5IV
Position Angle
331°
Star Colors
A: Yellow-white
B: Yellow-white
Discoverer
STF2637
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 11.6″ · PA: 331° · 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
AB binary. B, 8.7v at 13". C, optical.
0.016".
Survey Image
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