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HIP 12775 — Double Star in Horologium

Magnitude 6.2m DoubleStar Horologium (Hor) Visible
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1Physical Properties

Magnitude 6.15
Spectral Type A2V
Star Color White (B-V 0.09)

2Position & Identifiers

RA 02h 44m 10.7s
Dec -52° 34' 14.0"
Constellation Horologium (Hor)
HR 821
HIP 12775
HD 17254
SAO 232871
SIMBAD

3How easy to split?

Primary 6.2 mag Companion 11.7 mag Separation 1.3″
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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 V. hard V. hard V. 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 720 mm reflector.

4Visibility

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Best season Sep – Nov (peak: Oct)

5Multiple Star System

Separation 1.3″
Companion Mag 11.7
Position Angle 130°
Star Colors A: White
Discoverer TOK 816

Eyepiece View

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80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 130°

A: 6.2 · B: 11.7 · Sep: 1.3″ · PA: 130° · N up, E right

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

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.

NGC 1249
Hard+
Barred spiral galaxy
Galaxy mag 12.0 4.0° Horologium
C87
NGC 1261
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 8.4 4.9° Horologium
TW Hor
Hard+
Semi-regular variable, range 5.5–6.0
Variable Star mag 5.74 6.3° Horologium
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