When is the best time to observe HIP 108144?

HIP 108144 is best observed from July through September, with peak visibility during August when it transits around midnight in the Northern Hemisphere.

Where is HIP 108144 located in the sky?

HIP 108144 lies in the constellation Aquarius at right ascension 21h 55m and declination -03° 18′.

What telescope do I need to split HIP 108144?

Splitting HIP 108144 requires an aperture of roughly 60 mm or larger — the components are separated by about 16.0″ at magnitudes near 6.2. The companion is about 3.3 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 108144 — Double Star in Aquarius

Magnitude 6.2^m DoubleStar Aquarius (Aqr) Visible

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Observe

1Physical Properties

Magnitude 6.20

Spectral Type F5IV subgiant

Star Color Yellow (B-V 0.48)

2Position & Identifiers

RA 21h 54m 35.9s

Dec -03° 18' 04.0"

Constellation Aquarius (Aqr)

HR 8363

HIP 108144

HD 208177

SAO 145735

Double Cat 15432

SIMBAD

3How easy to split?

Primary 6.2 mag Companion 9.5 mag Separation 16.0″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Medium+	Medium+	Medium
150 mm Newton 150mm Newt.	Easy	Easy	Easy
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 Jul – Sep (peak: Aug)

5Multiple Star System B: optical

Separation 16.0″

Companion Mag 9.5

Position Angle 183°

Star Colors A: Yellow B: Orange

Discoverer STF2838

Notes

Optical.

Separation over time

Measured 1829 → 2015 (186 y)

Separation drift 21.7" → 16.0" (-5.70")

Rate -0.0306" / y

PA drift 185° → 183° (-2°, -0.011°/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.