32 Orionis — Double Star in Orion

Observable Double Star Fair (26/100)

Sep: 1.4", Companion: mag 5.8

Magnitude 4.2^m DoubleStar Orion (Ori) Visible

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Observe

1Physical Properties

Magnitude 4.20

Spectral Type B5V

Star Color Blue (B-V -0.14)

Distance 652 ly

2Position & Identifiers

RA 05h 30m 47.1s

Dec +05° 56' 53.0"

Constellation Orion (Ori)

HR 1839

HIP 25813

HD 36267

SAO 112849

Flamsteed 32 Ori

Double Cat 4115

3How easy to split?

Primary 4.2 mag Companion 5.8 mag Separation 1.4″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	V. hard+	V. hard+	V. hard+
150 mm Newton 150mm Newt.	Hard+	Hard+	Hard+
Celestron C8 (203 mm SCT) C8 203mm	Medium+	Medium+	Medium+

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 1.4″

Companion Mag 5.8

Position Angle 44°

Star Colors A: Blue B: White

Discoverer STF 728

Notes

4.49 B5IV, 5.82 B7V, 586y, a = 1.293". Combined mag. and colors.

Separation over time

Period: 613.7 y Eccentricity: 0.221 Now: 1.4", PA 43° + 0.04" in 5 years

Apparent separation over time, computed from ORB6 orbital elements. Steep curves indicate fast-changing pairs — catch them while they're splittable.

Eyepiece View

Telescope Eyepiece

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80x Dawes: 1.9″ TFOV: 0.6°

Seeing

Scale Realistic = true angular size

A: 4.2 · B: 5.8 · Sep: 1.4″ · PA: 44° · N up, E right

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

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7

Size Comparison

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8

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9

Spectral Classification

10

Hertzsprung-Russell Diagram

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Read: The Hertzsprung-Russell Diagram — Reading Stars Like a Map

11

Stellar Lifecycle

12

Blackbody Spectrum

13

Stellar Absorption Spectrum

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

14

Stellar Fusion

Discover

15Stellar Notes

Group/Cluster

Cas-Tau OB1; member of Pleiades group. Field of Ori OB1a but probably not member.

Dynamical

0.008".

16

Light Travel Time Machine

17

Relativistic Travel

Nearby in the Sky

Other targets within a few degrees — pan your scope a little and keep exploring.

Visibility scores assume a 150 mm Newton at Bortle 4.

HIP 25336; Gamma Orionis; 24 Orionis

Hot blue O-type star

Star mag 1.64 1.5° Orion

Tight double — a rewarding split at 1.9″

Double Star mag 5.46 2.7° Orion

HIP 25473; Psi2 Orionis; 30 Orionis

Colorful double, sep 3.0″

Double Star mag 4.59 3.0° Orion

Easy double, sep 32.0″

Double Star mag 5.00 3.1° Orion

Lambda Orionis Cluster

Open Cluster mag 2.8 4.1° Orion

Lambda Ori (BS1879)

Easy double, sep 4.1″

Double Star mag 3.54 4.1° Orion

HIP 27989; Alpha Orionis; 58 Orionis

Semi-regular variable, range 0.4–1.3

Variable Star mag 0.50 6.2° Orion

Diffuse Nebula mag 8.00 7.0° Orion

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