When is the best time to observe Chi Fornacis?

Chi Fornacis is best observed from October through December, with peak visibility during November when it transits around midnight in the Northern Hemisphere.

Where is Chi Fornacis located in the sky?

Chi Fornacis lies in the constellation Fornax at right ascension 03h 28m and declination -35° 51′.

What telescope do I need to split Chi Fornacis?

Splitting Chi Fornacis requires an aperture of roughly 80 mm or larger — the components are separated by about 6.5″ at magnitudes near 6.5. The companion is about 3.6 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

Chi Fornacis — Double Star in Fornax

HIP 16156; Chi3 Fornacis

Magnitude 6.5^m DoubleStar Fornax (For) Visible

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Observe

1Physical Properties

Magnitude 6.50

Spectral Type A1V

Star Color White (B-V 0.13)

2Position & Identifiers

RA 03h 28m 11.5s

Dec -35° 51' 12.0"

Constellation Fornax (For)

HR 1058

HIP 16156

HD 21635

SAO 194318

Bayer Chi3

SIMBAD Wikipedia

3How easy to split?

Primary 6.5 mag Companion 10.1 mag Separation 6.5″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Medium+	Medium	Hard+
150 mm Newton 150mm Newt.	Easy	Easy	Medium+
Celestron C8 (203 mm SCT) 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 Oct – Dec (peak: Nov)

5Multiple Star System

Separation 6.5″

Companion Mag 10.1

Companion Sp F8

Position Angle 247°

Star Colors A: White B: Yellow

Discoverer I 58

Separation over time

Measured 1895 → 2016 (121 y)

Separation drift 5.0" → 6.5" (+1.50")

Rate +0.0124" / y

PA drift 260° → 247° (-13°, -0.107°/y)

Slow change over generations — observable in lifetime comparisons.

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.