When is the best time to observe 33 Arietis?

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

Where is 33 Arietis located in the sky?

33 Arietis lies in the constellation Aries at right ascension 02h 41m and declination +27° 04′.

What telescope do I need to split 33 Arietis?

Splitting 33 Arietis requires an aperture of roughly 60 mm or larger — the components are separated by about 28.3″ at magnitudes near 5.3. The companion is about 4.3 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

33 Arietis — Double Star in Aries

Magnitude 5.3^m DoubleStar Aries (Ari) Visible

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Observe

1Physical Properties

Magnitude 5.30

Spectral Type A3V

Star Color White (B-V 0.09)

Distance 1,631 ly

2Position & Identifiers

RA 02h 40m 41.1s

Dec +27° 03' 39.0"

Constellation Aries (Ari)

HR 782

HIP 12489

HD 16628

SAO 75510

Flamsteed 33 Ari

Double Cat 2033

SIMBAD

3How easy to split?

Primary 5.3 mag Companion 9.6 mag Separation 28.3″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Medium+	Medium+	Medium
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 28.3″

Companion Mag 9.6

Position Angle 1°

Star Colors A: White B: Orange

Discoverer STF 289

Notes

CPM.

Separation over time

Measured 1779 → 2016 (237 y)

Separation drift 25.5" → 28.3" (+2.80")

Rate +0.0118" / y

PA drift 3° → 1° (-2°, -0.008°/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.