When is the best time to observe Delta Piscis Austrini?

Delta Piscis Austrini is best observed from July through September, with peak visibility during August when it transits around midnight in the Northern Hemisphere.

Where is Delta Piscis Austrini located in the sky?

Delta Piscis Austrini lies in the constellation Piscis Austrinus at right ascension 22h 56m and declination -32° 32′.

What telescope do I need to split Delta Piscis Austrini?

Splitting Delta Piscis Austrini requires an aperture of roughly 100 mm or larger — the components are separated by about 4.9″ at magnitudes near 4.2. The companion is about 5.0 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

Delta Piscis Austrini — Double Star in Piscis Austrinus

Magnitude 4.2^m DoubleStar Piscis Austrinus (PsA) Visible

Star Map + List + Plan

Observe

1Physical Properties

Magnitude 4.21

Spectral Type G8III giant

Star Color Orange (B-V 0.97)

Distance 155 ly

2Position & Identifiers

RA 22h 55m 56.9s

Dec -32° 32' 23.0"

Constellation Piscis Austrinus (PsA)

HR 8720

HIP 113246

HD 216763

SAO 214189

Bayer Delta

Flamsteed 23 PsA

SIMBAD

3How easy to split?

Primary 4.2 mag Companion 9.2 mag Separation 4.9″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Hard	Hard	Hard
150 mm Newton 150mm Newt.	Hard+	Hard+	Hard+
Celestron C8 (203 mm SCT) C8 203mm	Medium+	Medium+	Medium+

Easy Medium Hard Very hard Impossible

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

4Visibility

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Best season Jul – Sep (peak: Aug)

5Multiple Star System

Separation 4.9″

Companion Mag 9.2

Position Angle 250°

Star Colors A: Orange

Discoverer HWE 91

Notes

CPM. Companion G3.

Separation over time

Measured 1877 → 2016 (139 y)

Separation drift 4.7" → 4.9" (+0.20")

Rate +0.0014" / y

PA drift 237° → 250° (+13°, +0.094°/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.