When is the best time to observe HIP 112117?

HIP 112117 is best observed from July through September, with peak visibility during August when it transits around midnight in the Northern Hemisphere.

Where is HIP 112117 located in the sky?

HIP 112117 lies in the constellation Grus at right ascension 22h 43m and declination -47° 13′.

What telescope do I need to split HIP 112117?

Splitting HIP 112117 requires an aperture of roughly 80 mm or larger — the components are separated by about 7.1″ at magnitudes near 6.0. The companion is about 5.1 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 112117 — Double Star in Grus

Magnitude 6.0^m DoubleStar Grus (Gru) Visible

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Observe

1Physical Properties

Magnitude 5.98

Spectral Type G0V

Star Color Yellow (B-V 0.58)

Distance 49 ly

2Position & Identifiers

RA 22h 42m 36.9s

Dec -47° 12' 38.0"

Constellation Grus (Gru)

HR 8635

HIP 112117

HD 214953

SAO 231257

SIMBAD

3How easy to split?

Primary 6.0 mag Companion 11.1 mag Separation 7.1″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Hard	Hard	V. hard+
150 mm Newton 150mm Newt.	Medium+	Medium	Medium
Celestron C8 (203 mm SCT) C8 203mm	Easy	Medium+	Medium

Easy Medium Hard Very hard Impossible

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

4Visibility

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Best season Jul – Sep (peak: Aug)

5Multiple Star System C: optical

Separation 7.1″

Companion Mag 11.1

Companion Sp M1

Position Angle 125°

Star Colors A: Yellow B: Red

Discoverer COO 252

Notes

Binary. B is M1.

Separation over time

Measured 1894 → 2016 (122 y)

Separation drift 5.0" → 7.1" (+2.10")

Rate +0.0172" / y

PA drift 140° → 125° (-15°, -0.123°/y)

Apparent motion is significant on a human timescale — worth revisiting in a decade.

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.