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HIP 26199 — Double Star in Orion

Observable Double Star Excellent (63/100)

Sep: 35.3", Companion: mag 5.5

Magnitude 4.8m DoubleStar Orion (Ori) Visible
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Observe

1Physical Properties

Magnitude 4.78
Spectral Type B0.5V
Star Color Blue (B-V -0.25)
Distance 652 ly

2Position & Identifiers

RA 05h 35m 02.7s
Dec -06° 00' 07.0"
Constellation Orion (Ori)
HR 1887
HIP 26199
HD 36960
SAO 132301
Double Cat 4182

3How easy to split?

Primary 4.8 mag Companion 5.5 mag Separation 35.3″
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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Easy Easy Easy
150mm Newt. Easy Easy Easy
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 Nov – Jan (peak: Dec)

5Multiple Star System

Separation 35.3″
Companion Mag 5.5
Companion Sp B1V
Position Angle 224°
Star Colors A: Blue B: Blue
Discoverer STF 747
Fixed with HR 1886.

Separation over time

Measured 1825 → 2021 (196 y)
Separation drift 35.8" → 35.3" (-0.50")
Rate -0.0026" / y
PA drift 223° → 224° (+1°, +0.005°/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 224°

A: 4.8 · B: 5.5 · Sep: 35.3″ · PA: 224° · N up, E right

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

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6

Size Comparison

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8

Spectral Classification

9

Hertzsprung-Russell Diagram

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10

Stellar Lifecycle

11

Blackbody Spectrum

12

Stellar Absorption Spectrum

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

13

Stellar Fusion

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14Stellar Notes

Iota Ori cluster; Ori OB1c4; sword of Orion.
15

Light Travel Time Machine

16

Relativistic Travel

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