When is the best time to observe HIP 207?

HIP 207 is best observed from August through October, with peak visibility during September when it transits around midnight in the Northern Hemisphere.

Where is HIP 207 located in the sky?

HIP 207 lies in the constellation Cassiopeia at right ascension 00h 03m and declination +66° 06′.

What telescope do I need to split HIP 207?

Splitting HIP 207 requires an aperture of roughly 60 mm or larger — the components are separated by about 15.2″ at magnitudes near 5.9. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 207 — Double Star in Cassiopeia

Observable Double Star Showpiece (77/100)

Sep: 15.2", Companion: mag 7.2

Magnitude 5.9^m DoubleStar Cassiopeia (Cas) Visible

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Observe

1Physical Properties

Magnitude 5.86

Spectral Type G8III giant

Star Color Orange (B-V 1.09)

Distance 326 ly

2Position & Identifiers

RA 00h 02m 36.1s

Dec +66° 05' 56.0"

Constellation Cassiopeia (Cas)

HR 9094

HIP 207

HD 225009

SAO 10937

Double Cat 1

SIMBAD

3How easy to split?

Primary 5.9 mag Companion 7.2 mag Separation 15.2″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Easy	Easy	Easy
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 Aug – Oct (peak: Sep)

5Multiple Star System Triple

Components 3 (triple)

Component IDs AB

Separation 15.2″

Companion Mag 7.2

Companion Sp A1V

Position Angle 70°

Star Colors A: Orange B: White

Discoverer STF3053

Notes

ADS 1B, 7.47V, +0.08(B-V), +0.05(U-B), A2Vn, vsini 275k/s, may be shell star. AB binary. C, 10.8m at 99" optical.

Separation over time

Measured 1828 → 2018 (190 y)

Separation drift 18.0" → 15.2" (-2.80")

Rate -0.0147" / y

PA drift 69° → 70° (+1°, +0.005°/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.