When is the best time to observe HIP 105913?

HIP 105913 is best observed from July through September, with peak visibility during August when it transits around midnight in the Northern Hemisphere.

Where is HIP 105913 located in the sky?

HIP 105913 lies in the constellation Microscopium at right ascension 21h 27m and declination -42° 33′.

What telescope do I need to split HIP 105913?

Splitting HIP 105913 requires an aperture of roughly 100 mm or larger — the components are separated by about 2.8″ at magnitudes near 5.5. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 105913 — Double Star in Microscopium

Observable Double Star Good (49/100)

Sep: 2.8", Companion: mag 8.2

Magnitude 5.5^m DoubleStar Microscopium (Mic) Visible

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Observe

1Physical Properties

Magnitude 5.51

Spectral Type Am

Star Color Yellow-white (B-V 0.39)

2Position & Identifiers

RA 21h 27m 01.6s

Dec -42° 32' 52.0"

Constellation Microscopium (Mic)

HR 8202

HIP 105913

HD 204018

SAO 230692

SIMBAD

3How easy to split?

Primary 5.5 mag Companion 8.2 mag Separation 2.8″

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

5Multiple Star System

Separation 2.8″

Companion Mag 8.2

Position Angle 151°

Star Colors A: Yellow-white B: Orange

Discoverer MLO 6

Separation over time

Measured 1879 → 2015 (136 y)

Separation drift 4.1" → 2.8" (-1.30")

Rate -0.0096" / y

PA drift 146° → 151° (+5°, +0.037°/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.