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HIP 106062 — Double Star in Pegasus

Magnitude 5.9m DoubleStar Pegasus (Peg) Visible
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1Physical Properties

Magnitude 5.93
Spectral Type M4.5III-IIIa giant
Star Color Red (B-V 1.53)

2Position & Identifiers

RA 21h 28m 59.9s
Dec +22° 10' 46.0"
Constellation Pegasus (Peg)
HR 8223
HIP 106062
HD 204585
SAO 89737

3How easy to split?

Primary 5.9 mag Companion 10.2 mag Separation 40.7″
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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Medium Medium Hard+
150mm Newt. Easy Medium+ Medium+
C8 203mm Easy Easy Easy
Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

4Visibility

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Best season Jul – Sep (peak: Aug)

5Multiple Star System Triple C: optical

Components 3 (triple)
Component IDs AB
Separation 40.7″
Companion Mag 10.2
Position Angle 177°
Star Colors A: Red
Discoverer HJ 1647

Separation over time

Measured 1892 → 2021 (129 y)
Separation drift 41.0" → 40.7" (-0.30")
Rate -0.0023" / y
PA drift 177° → 177° (+0°, +0.000°/y)

Essentially fixed on human timescales — the same view your grandchildren will see.

Measured from the WDS observational archive. No orbital solution has been derived — most likely the period is too long to fit an orbit to the available measurement arc.

Eyepiece View

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80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 177°

A: 5.9 · B: 10.2 · Sep: 40.7″ · PA: 177° · N up, E right

Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″

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Size Comparison

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Spectral Classification

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Hertzsprung-Russell Diagram

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Stellar Lifecycle

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Blackbody Spectrum

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Stellar Absorption Spectrum

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

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Stellar Fusion

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