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 26m and declination -35° 55′.

What telescope do I need to split Chi Fornacis?

Splitting Chi Fornacis requires an aperture of roughly 60 mm or larger — the components are separated by about 85.1″ at magnitudes near 6.4. 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 15987; Chi1 Fornacis

Magnitude 6.4^m DoubleStar Fornax (For) Visible

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Observe

1Physical Properties

Magnitude 6.39

Spectral Type A1IV subgiant

Star Color White (B-V 0.08)

2Position & Identifiers

RA 03h 25m 55.8s

Dec -35° 55' 15.0"

Constellation Fornax (For)

HR 1042

HIP 15987

HD 21423

SAO 194289

Bayer Chi1

SIMBAD Wikipedia

3How easy to split?

Primary 6.4 mag Companion 10.0 mag Separation 85.1″

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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 85.1″

Companion Mag 9.9

Companion Sp A9V

Position Angle 214°

Star Colors A: White B: Yellow-white

Discoverer SKF1280

Separation over time

Measured 1913 → 2015 (102 y)

Separation drift 85.4" → 85.1" (-0.30")

Rate -0.0029" / y

PA drift 214° → 214° (+0°, +0.000°/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.