When is the best time to observe HIP 9586?

HIP 9586 is best observed from September through November, with peak visibility during October when it transits around midnight in the Northern Hemisphere.

Where is HIP 9586 located in the sky?

HIP 9586 lies in the constellation Cassiopeia at right ascension 02h 03m and declination +73° 51′.

What telescope do I need to split HIP 9586?

Splitting HIP 9586 requires an aperture of roughly 80 mm or larger — the components are separated by about 5.3″ at magnitudes near 6.2. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 9586 — Double Star in Cassiopeia

Magnitude 6.2^m DoubleStar Cassiopeia (Cas) Visible

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Observe

1Physical Properties

Magnitude 6.23

Spectral Type A5III giant

Distance 815 ly

2Position & Identifiers

RA 02h 03m 10.5s

Dec +73° 51' 02.0"

Constellation Cassiopeia (Cas)

HR 579

HIP 9586

HD 12173

SAO 4559

Double Cat 1606

SIMBAD

3How easy to split?

Primary 6.2 mag Companion 9.1 mag Separation 5.3″

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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 Sep – Nov (peak: Oct)

5Multiple Star System

Separation 5.3″

Companion Mag 9.1

Position Angle 196°

Discoverer STF 191

Separation over time

Measured 1832 → 2016 (184 y)

Separation drift 5.6" → 5.3" (-0.30")

Rate -0.0016" / y

PA drift 191° → 196° (+5°, +0.027°/y)

Essentially fixed on human timescales — the same view your grandchildren will see.

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.