When is the best time to observe HIP 110109?

HIP 110109 is best observed from July through September, with peak visibility during August when it transits around midnight in the Northern Hemisphere.

Where is HIP 110109 located in the sky?

HIP 110109 lies in the constellation Grus at right ascension 22h 18m and declination -53° 38′.

What telescope do I need to split HIP 110109?

Splitting HIP 110109 requires an aperture of roughly 340 mm or larger — the components are separated by about 1.7″ at magnitudes near 5.4. The companion is about 4.3 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 110109 — Double Star in Grus

Magnitude 5.4^m DoubleStar Grus (Gru) Visible

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Observe

1Physical Properties

Magnitude 5.37

Spectral Type G3V

Star Color Yellow (B-V 0.60)

Distance 39 ly

2Position & Identifiers

RA 22h 18m 15.6s

Dec -53° 37' 40.0"

Constellation Grus (Gru)

HR 8501

HIP 110109

HD 211415

SAO 247400

SIMBAD

3How easy to split?

Primary 5.4 mag Companion 9.7 mag Separation 1.7″

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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.	V. hard+	V. hard+	V. 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 340 mm reflector.

4Visibility

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Best season Jul – Sep (peak: Aug)

5Multiple Star System

Separation 1.7″

Companion Mag 9.7

Position Angle 53°

Star Colors A: Yellow B: Red

Discoverer HDO 298

Separation over time

Measured 1894 → 2021 (127 y)

Separation drift 2.5" → 1.7" (-0.80")

Rate -0.0063" / y

PA drift 10° → 53° (+43°, +0.339°/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.