When is the best time to observe Beta Tucanae?

Beta Tucanae is best observed from August through October, with peak visibility during September when it transits around midnight in the Northern Hemisphere.

Where is Beta Tucanae located in the sky?

Beta Tucanae lies in the constellation Tucana at right ascension 00h 32m and declination -62° 58′.

What telescope do I need to split Beta Tucanae?

Splitting Beta Tucanae requires an aperture of roughly 550 mm or larger — the components are separated by about 0.4″ at magnitudes near 4.5. Larger apertures and steady seeing help resolve the pair cleanly.

Beta Tucanae — Double Star in Tucana

HIP 2487; Beta2 Tucanae

DoubleStar Tucana (Tuc) Visible

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1Physical Properties

Magnitude 4.54

Spectral Type A2V+A7V

Star Color Yellow-white (B-V 0.15)

Distance 109 ly

2Position & Identifiers

RA 00h 31m 33.6s

Dec -62° 57' 57.0"

Constellation Tucana (Tuc)

HR 127

HIP 2487

HD 2885

Bayer Beta2

SIMBAD Wikipedia

3How easy to split?

Primary 4.5 mag Companion 6.5 mag Separation 0.4″

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

Easy Medium Hard Very hard Impossible

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

To reach "Medium" at Bortle 3, you'd need at least a 550 mm reflector.

4Visibility

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Best season Aug – Oct (peak: Sep)

5Multiple Star System Sextuple

Components 6 (sextuple)

Component IDs AC

Separation 0.4″

Companion Mag 6.5

Companion Sp A7V

Position Angle 330°

Star Colors A: Yellow-white C: Yellow-white

Discoverer I 260

Notes

CD 4.9 A2V, 5.6 A7V, 44.43y, a = 0.385". Combined mag., colors. D-C = 1.17V.

Separation over time

Measured 1895 → 2021 (126 y)

Separation drift 0.60" → 0.40" (-0.20")

Rate -0.0016" / y

PA drift 335° → 330° (-5°, -0.040°/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.