When is the best time to observe HIP 90763?

HIP 90763 is best observed from May through July, with peak visibility during June when it transits around midnight in the Northern Hemisphere.

Where is HIP 90763 located in the sky?

HIP 90763 lies in the constellation Sagittarius at right ascension 18h 31m and declination -32° 59′.

What telescope do I need to split HIP 90763?

Splitting HIP 90763 requires an aperture of roughly 100 mm or larger — the components are separated by about 3.4″ at magnitudes near 5.3. The companion is about 4.4 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 90763 — Double Star in Sagittarius

Magnitude 5.3^m DoubleStar Sagittarius (Sgr) Visible

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Observe

1Physical Properties

Magnitude 5.34

Spectral Type A3m

Star Color White (B-V 0.16)

Distance 142 ly

2Position & Identifiers

RA 18h 31m 04.8s

Dec -32° 59' 21.0"

Constellation Sagittarius (Sgr)

HR 6936

HIP 90763

HD 170479

SAO 210257

SIMBAD

3How easy to split?

Primary 5.3 mag Companion 9.8 mag Separation 3.4″

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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 May – Jul (peak: Jun)

5Multiple Star System Triple C: optical

Components 3 (triple)

Component IDs AB

Separation 3.4″

Companion Mag 9.8

Position Angle 185°

Star Colors A: White B: Orange

Discoverer HWE 43

Notes

AB, CPM.

Separation over time

Measured 1877 → 2016 (139 y)

Separation drift 2.3" → 3.4" (+1.10")

Rate +0.0079" / y

PA drift 208° → 185° (-23°, -0.165°/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.