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HIP 25007 — Double Star in Columba

Magnitude 6.1m DoubleStar Columba (Col) Visible
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1Physical Properties

Magnitude 6.09
Range 6.03 - 6.11
Variable Type BE
Spectral Type B5IVnpe supergiant
Star Color Blue (B-V -0.19)

2Position & Identifiers

RA 05h 21m 16.9s
Dec -34° 20' 43.0"
Constellation Columba (Col)
HR 1772
HIP 25007
HD 35165
SAO 195770
Variable ID Var?
SIMBAD

3How easy to split?

Primary 6.1 mag Companion 10.9 mag Separation 2.2″
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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. V. hard V. hard V. hard
150mm Newt. V. hard+ V. hard+ V. hard+
C8 203mm Hard Hard Hard
Easy Medium Hard Very hard Impossible

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

To reach "Medium" at Bortle 3, you'd need at least a 320 mm reflector.

4Visibility

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Best season Nov – Jan (peak: Dec)

5Multiple Star System

Separation 2.2″
Companion Mag 10.9
Position Angle 7°
Star Colors A: Blue B: Yellow
Discoverer DAW 117

Eyepiece View

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80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 7°

A: 6.1 · B: 10.9 · Sep: 2.2″ · PA: 7° · N up, E right

At limit · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″

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Size Comparison

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Spectral Classification

9

Hertzsprung-Russell Diagram

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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

Amp. 0.13:V.
Shell star.

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.

IC 2122
Hard
Elliptical galaxy
Galaxy mag 13.08 2.8° Columba
Gamma Cae
Medium
Easy double, sep 3.2″
Double Star mag 4.55 3.6° Caelum
C73
NGC 1851
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 7.3 5.9° Columba
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