When is the best time to observe HIP 103635?

HIP 103635 is best observed from June through August, with peak visibility during July when it transits around midnight in the Northern Hemisphere.

Where is HIP 103635 located in the sky?

HIP 103635 lies in the constellation Delphinus at right ascension 20h 60m and declination +16° 49′.

What telescope do I need to split HIP 103635?

Splitting HIP 103635 requires an aperture of roughly 60 mm or larger — the components are separated by about 70.9″ at magnitudes near 6.7. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 103635 — Double Star in Delphinus

Magnitude 6.7^m DoubleStar Delphinus (Del) Visible

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Observe

1Physical Properties

Magnitude 6.66

Spectral Type F4III giant

Star Color Yellow-white (B-V 0.38)

2Position & Identifiers

RA 20h 59m 50.8s

Dec +16° 49' 27.0"

Constellation Delphinus (Del)

HR 8037

HIP 103635

HD 199941

SAO 106738

SIMBAD

3How easy to split?

Primary 6.7 mag Companion 9.2 mag Separation 70.9″

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

5Multiple Star System

Separation 70.9″

Companion Mag 9.2

Position Angle 36°

Star Colors A: Yellow-white B: Orange

Discoverer STTA213

Separation over time

Measured 1875 → 2016 (141 y)

Separation drift 70.9" → 70.9" (+0.00")

Rate +0.0000" / y

PA drift 37° → 36° (-1°, -0.007°/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.