40 Cyg

HIP 100907; 40 Cyg DoubleStar Cyg Visible Level 5 Expert level - Requires steady seeing

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Physical Properties

Magnitude 5.62

Spectral Type A3V

Star Color White (B-V 0.06)

Distance 155.3 ly

Position & Identifiers

RA 20h 27m 34.3s

Dec +38° 26' 25.0"

Constellation Cyg

HR 7826

HIP 100907

Flamsteed 40 Cyg

Visibility

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Multiple Star System

Separation 0.5″

Companion Mag 8.4

Position Angle 335°

Star Colors A: White B: Yellow

Discoverer GUL 3

Eyepiece View

Telescope Eyepiece

80x Dawes: 1.9″ TFOV: 0.6°

Seeing

Scale Realistic = true angular size

Sep: 0.5″ · PA: 335° · 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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Survey Image

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