Eta Cap

HIP 104019; Eta Cap; 22 Cap DoubleStar Cap Visible Level 5 Expert level - Requires steady seeing

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Physical Properties

Magnitude 4.84

Spectral Type A5V

Star Color Yellow-white (B-V 0.17)

Distance 59.3 ly

Position & Identifiers

RA 21h 04m 24.3s

Dec -19° 51' 18.0"

Constellation Cap

HR 8060

HIP 104019

Bayer Eta

Flamsteed 22 Cap

Visibility

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Multiple Star System

Separation 0.3″

Companion Mag 7.4

Companion Sp F2V

Position Angle 246°

Star Colors A: Yellow-white B: Yellow-white

Discoverer FIN 328

Eyepiece View

Telescope Eyepiece

80x Dawes: 1.9″ TFOV: 0.6°

Seeing

Scale Realistic = true angular size

Sep: 0.3″ · PA: 246° · N up, E left

Unresolved · 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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