When is the best time to observe HIP 77927?

HIP 77927 is best observed from April through June, with peak visibility during May when it transits around midnight in the Northern Hemisphere.

Where is HIP 77927 located in the sky?

HIP 77927 lies in the constellation Triangulum Australe at right ascension 15h 55m and declination -60° 45′.

What telescope do I need to split HIP 77927?

Splitting HIP 77927 requires an aperture of roughly 60 mm or larger — the components are separated by about 44.5″ at magnitudes near 6.2. The companion is about 3.8 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 77927 — Double Star in Triangulum Australe

Magnitude 6.2^m DoubleStar Triangulum Australe (TrA) Visible

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Observe

1Physical Properties

Magnitude 6.15

Spectral Type B9II bright giant

Star Color White (B-V 0.10)

2Position & Identifiers

RA 15h 54m 52.6s

Dec -60° 44' 36.0"

Constellation Triangulum Australe (TrA)

HR 5898

HIP 77927

HD 141913

SAO 253344

SIMBAD

3How easy to split?

Primary 6.2 mag Companion 10.0 mag Separation 44.5″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Medium+	Medium	Hard+
150 mm Newton 150mm Newt.	Easy	Easy	Medium+
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 Apr – Jun (peak: May)

5Multiple Star System Quadruple

Components 4 (quadruple)

Component IDs AC

Separation 44.5″

Companion Mag 10.0

Position Angle 47°

Star Colors A: White C: Yellow-white

Discoverer DUN 194

Notes

B, 10.5v at 1.08"; C, 9.1 at 45"; D, 8.7 at 48".

Separation over time

Measured 1836 → 2020 (184 y)

Separation drift 43.5" → 44.5" (+1.00")

Rate +0.0054" / y

PA drift 51° → 47° (-4°, -0.022°/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.