When is the best time to observe Phi Fornacis?

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

Where is Phi Fornacis located in the sky?

Phi Fornacis lies in the constellation Fornax at right ascension 02h 28m and declination -33° 49′.

What telescope do I need to split Phi Fornacis?

Splitting Phi Fornacis requires an aperture of roughly 60 mm or larger — the components are separated by about 391.1″ at magnitudes near 5.1. Larger apertures and steady seeing help resolve the pair cleanly.

Phi Fornacis — Double Star in Fornax

Observable Double Star Good (40/100)

Sep: 391.1", Companion: mag 7.6

Magnitude 5.1^m DoubleStar Fornax (For) Visible

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Observe

1Physical Properties

Magnitude 5.14

Spectral Type A2V

Star Color White (B-V 0.10)

Distance 217 ly

2Position & Identifiers

RA 02h 28m 01.7s

Dec -33° 48' 40.0"

Constellation Fornax (For)

HR 724

HIP 11477

HD 15427

SAO 193723

Bayer Phi

SIMBAD

3How easy to split?

Primary 5.1 mag Companion 7.6 mag Separation 391.1″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Easy	Easy	Easy
150 mm Newton 150mm Newt.	Easy	Easy	Easy
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 Sep – Nov (peak: Oct)

5Multiple Star System

Separation 391.1″

Companion Mag 7.6

Companion Sp F7V

Position Angle 218°

Star Colors A: White B: Yellow

Discoverer SHY 140

Separation over time

Measured 1913 → 2016 (103 y)

Separation drift 391.5" → 391.1" (-0.40")

Rate -0.0039" / y

PA drift 218° → 218° (+0°, +0.000°/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.