When is the best time to observe HIP 66821?

HIP 66821 is best observed from March through May, with peak visibility during April when it transits around midnight in the Northern Hemisphere.

Where is HIP 66821 located in the sky?

HIP 66821 lies in the constellation Centaurus at right ascension 13h 42m and declination -54° 34′.

What telescope do I need to split HIP 66821?

Splitting HIP 66821 requires an aperture of roughly 80 mm or larger — the components are separated by about 5.6″ at magnitudes near 5.0. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 66821 — Double Star in Centaurus

Observable Double Star Good (58/100)

Sep: 5.6", Companion: mag 6.5

Magnitude 5.0^m DoubleStar Centaurus (Cen) Visible

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Observe

1Physical Properties

Magnitude 5.01

Spectral Type B8Vn

Star Color Blue-white (B-V -0.05)

Distance 1,087 ly

2Position & Identifiers

RA 13h 41m 44.7s

Dec -54° 33' 36.0"

Constellation Centaurus (Cen)

HR 5141

HIP 66821

HD 118991

SAO 241076

SIMBAD

3How easy to split?

Primary 5.0 mag Companion 6.5 mag Separation 5.6″

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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 Mar – May (peak: Apr)

5Multiple Star System

Separation 5.6″

Companion Mag 6.5

Position Angle 163°

Star Colors A: Blue-white B: Yellow-white

Discoverer DUN 141

Separation over time

Measured 1826 → 2016 (190 y)

Separation drift 3.0" → 5.6" (+2.60")

Rate +0.0137" / y

PA drift 168° → 163° (-5°, -0.026°/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.