When is the best time to observe HIP 17735?

HIP 17735 is best observed from October through December, with peak visibility during November when it transits around midnight in the Northern Hemisphere.

Where is HIP 17735 located in the sky?

HIP 17735 lies in the constellation Perseus at right ascension 03h 48m and declination +33° 36′.

What telescope do I need to split HIP 17735?

Splitting HIP 17735 requires an aperture of roughly 100 mm or larger — the components are separated by about 3.3″ at magnitudes near 6.6. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 17735 — Double Star in Perseus

Magnitude 6.6^m DoubleStar Perseus (Per) Visible

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Observe

1Physical Properties

Magnitude 6.57

Range 6.55 - 6.57

Period 46.6 hours

Variable Type Ellipsoidal Variable

Spectral Type B2.5V

Star Color Blue (B-V 0.08) (reddened by dust)

Distance 652 ly

2Position & Identifiers

RA 03h 47m 52.6s

Dec +33° 36' 00.0"

Constellation Perseus (Per)

HR 1163

HIP 17735

HD 23625

SAO 56709

Double Cat 2772

SIMBAD

3How easy to split?

Primary 6.6 mag Companion 9.4 mag Separation 3.3″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Hard+	Hard+	Hard+
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 Oct – Dec (peak: Nov)

5Light Curve

6Multiple Star System

Separation 3.3″

Companion Mag 9.4

Position Angle 13°

Star Colors A: Blue (reddened by dust) B: Yellow

Discoverer STF 448

Notes

Binary.

Separation over time

Measured 1827 → 2020 (193 y)

Separation drift 3.0" → 3.3" (+0.30")

Rate +0.0016" / y

PA drift 23° → 13° (-10°, -0.052°/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.