57 Cyg

HIP 103089; 57 Cyg DoubleStar Cyg Visible Level 6 Professional/Research - Requires steady seeing

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Physical Properties

Magnitude 4.78

Spectral Type B5V

Star Color Blue-white (B-V -0.14)

Position & Identifiers

RA 20h 53m 14.8s

Dec +44° 23' 14.0"

Constellation Cyg

HR 8001

HIP 103089

Flamsteed 57 Cyg

Visibility

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Multiple Star System

Separation 0.3″

Companion Mag 8.8

Position Angle 183°

Star Colors A: Blue-white B: Yellow

Discoverer LSC 94

Eyepiece View

Telescope Eyepiece

80x Dawes: 1.9″ TFOV: 0.6°

Seeing

Scale Realistic = true angular size

Sep: 0.3″ · PA: 183° · 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

Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.

Stellar Notes

Spectroscopic Binary

2.854825d, K 111.9k/s, V0 -21.1k/s, msin3i 2.04, asini 4.34. Apsidal period 203y.

Survey Image

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