Theta Sge
HIP 99352; Theta Sge; 17 Sge
DoubleStar
Sagitta
(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 ly
Position & Identifiers
RA
20h 09m 56.6s
Dec
+20° 54' 55.0"
Constellation
Sagitta
(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 C,D: optical
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: 2.3″
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
AB binary. B, 8.7v at 13". C, optical.
0.016".
Light Travel Time Machine
Relativistic Travel
Survey Image
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