When is the best time to observe Tau Piscis Austrini?

Tau 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 Tau Piscis Austrini located in the sky?

Tau Piscis Austrini lies in the constellation Poisson austral at right ascension 22h 10m and declination -32° 33′.

What telescope do I need to split Tau Piscis Austrini?

Splitting Tau Piscis Austrini requires an aperture of roughly 970 mm or larger — the components are separated by about 1.4″ at magnitudes near 4.9. The companion is about 6.5 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

Tau Piscis Austrini — Étoile Double dans Poisson austral

Magnitude 4.9^m DoubleStar Poisson austral (PsA) Visible

Carte du Ciel + Liste + Plan

Observer

1Propriétés Physiques

Magnitude 4.92

Type Spectral F6V

Couleur de l'Étoile Jaune (B-V 0.48)

Distance 62 ly

2Position et Identifiants

RA 22h 10m 08.8s

Dec -32° 32' 54.0"

Constellation Poisson austral (PsA)

HR 8447

HIP 109422

HD 210302

SAO 213602

Bayer Tau

Flamsteed 15 PsA

SIMBAD

3Facilité de séparation

Principale 4.9 mag Compagnon 11.4 mag Séparation 1.4″

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Télescope	Bortle 3	Bortle 4	Bortle 5
Réfracteur 80 mm Réfr. 80mm	T. diff.	T. diff.	T. diff.
Newton 150 mm Newt. 150mm	T. diff.	T. diff.	T. diff.
Celestron C8 (SCT 203 mm) C8 203mm	T. diff.	T. diff.	T. diff.