109 Her
HIP 90139; 109 Her
DoubleStar
Hercules
(Her)
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
3.84
Spectral Type
K2IIIab
Star Color
Red
(B-V 1.18)
Distance
119 ly
Position & Identifiers
RA
18h 23m 41.9s
Dec
+21° 46' 11.0"
Constellation
Hercules
(Her)
HR
6895
HIP
90139
Flamsteed
109 Her
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Visibility
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Multiple Star System
Separation
238.0″
Companion Mag
11.1
Position Angle
323°
Star Colors
A: Red
Discoverer
STT 587
Eyepiece View
32x
Dawes: 1.9″
TFOV: 1.6°
Realistic = true angular size
Sep: 238.0″ · PA: 323° · 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
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Stellar Fusion
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