When is the best time to observe HIP 75091?

HIP 75091 is best observed from April through June, with peak visibility during May when it transits around midnight in the Northern Hemisphere.

Where is HIP 75091 located in the sky?

HIP 75091 lies in the constellation Triangulum Australe at right ascension 15h 21m and declination -67° 29′.

What telescope do I need to split HIP 75091?

Splitting HIP 75091 requires an aperture of roughly 150 mm or larger — the components are separated by about 1.3″ at magnitudes near 6.3. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 75091 — Double Star in Triangulum Australe

Magnitude 6.3^m DoubleStar Triangulum Australe (TrA) Visible

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Observe

1Physical Properties

Magnitude 6.28

Spectral Type B3V

Star Color Blue (B-V -0.09)

2Position & Identifiers

RA 15h 20m 40.7s

Dec -67° 28' 53.0"

Constellation Triangulum Australe (TrA)

HR 5684

HIP 75091

HD 135737

SAO 253115

SIMBAD

3How easy to split?

Primary 6.3 mag Companion 8.2 mag Separation 1.3″

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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	Medium	Medium	Medium

Easy Medium Hard Very hard Impossible

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

4Visibility

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Best season Apr – Jun (peak: May)

5Multiple Star System

Separation 1.3″

Companion Mag 8.2

Companion Sp B7III

Position Angle 108°

Star Colors A: Blue B: Blue-white

Discoverer I 332

Separation over time

Measured 1901 → 2016 (115 y)

Separation drift 1.1" → 1.3" (+0.20")

Rate +0.0017" / y

PA drift 108° → 108° (+0°, +0.000°/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.