When is the best time to observe HIP 74750?

HIP 74750 is best observed from April through June, with peak visibility during May when it transits around midnight in the Northern Hemisphere.

Where is HIP 74750 located in the sky?

HIP 74750 lies in the constellation Circinus at right ascension 15h 17m and declination -60° 54′.

What telescope do I need to split HIP 74750?

Splitting HIP 74750 requires an aperture of roughly 260 mm or larger — the components are separated by about 1.2″ at magnitudes near 5.7. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 74750 — Double Star in Circinus

Observable Double Star Fair (25/100)

Sep: 1.2", Companion: mag 8.6

Magnitude 5.7^m DoubleStar Circinus (Cir) Visible

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Observe

1Physical Properties

Magnitude 5.73

Spectral Type B0.5Ve

Star Color Blue (B-V -0.08)

2Position & Identifiers

RA 15h 16m 36.4s

Dec -60° 54' 14.0"

Constellation Circinus (Cir)

HR 5661

HIP 74750

HD 135160

SAO 253082

SIMBAD

3How easy to split?

Primary 5.7 mag Companion 8.6 mag Separation 1.2″

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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.	Hard	Hard	Hard
Celestron C8 (203 mm SCT) C8 203mm	Hard	Hard	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 260 mm reflector.

4Visibility

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Best season Apr – Jun (peak: May)

5Multiple Star System Triple

Components 3 (triple)

Component IDs AB

Separation 1.2″

Companion Mag 8.6

Position Angle 164°

Star Colors A: Blue B: Yellow-white

Discoverer B 1777

Notes

Component C, A5V, optical. Component B, RV -16k/s. CPM with HR 5664.

Separation over time

Measured 1930 → 2016 (86 y)

Separation drift 1.2" → 1.2" (+0.00")

Rate +0.0000" / y

PA drift 163° → 164° (+1°, +0.012°/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.