109 Her

HIP 90139; 109 Her DoubleStar Her Visible Level 3 Medium telescope (6-8") - Requires steady seeing

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Physical Properties

Magnitude 3.84

Spectral Type K2IIIab

Star Color Red (B-V 1.18)

Distance 118.9 ly

Position & Identifiers

RA 18h 23m 41.9s

Dec +21° 46' 11.0"

Constellation Her

HR 6895

HIP 90139

Flamsteed 109 Her

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

Telescope Eyepiece

32x Dawes: 1.9″ TFOV: 1.6°

Seeing

Scale Realistic = true angular size

Sep: 238.0″ · PA: 323° · 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

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Survey Image

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