When is the best time to observe HIP 57805?

HIP 57805 is best observed from February through April, with peak visibility during March when it transits around midnight in the Northern Hemisphere.

Where is HIP 57805 located in the sky?

HIP 57805 lies in the constellation Ursa Major at right ascension 11h 51m and declination +33° 22′.

What telescope do I need to split HIP 57805?

Splitting HIP 57805 requires an aperture of roughly 60 mm or larger — the components are separated by about 46.1″ at magnitudes near 6.3. The companion is about 3.0 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 57805 — Double Star in Ursa Major

Magnitude 6.3^m DoubleStar Ursa Major (UMa) Visible

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Observe

1Physical Properties

Magnitude 6.27

Spectral Type Am

Star Color Yellow-white (B-V 0.32)

2Position & Identifiers

RA 11h 51m 09.4s

Dec +33° 22' 30.0"

Constellation Ursa Major (UMa)

HR 4545

HIP 57805

HD 102942

SAO 62731

SIMBAD

3How easy to split?

Primary 6.3 mag Companion 9.3 mag Separation 46.1″

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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 Feb – Apr (peak: Mar)

5Multiple Star System

Separation 46.1″

Companion Mag 9.3

Position Angle 274°

Star Colors A: Yellow-white B: Orange

Discoverer ARG 101

Separation over time

Measured 1894 → 2023 (129 y)

Separation drift 45.9" → 46.1" (+0.20")

Rate +0.0016" / y

PA drift 274° → 274° (+0°, +0.000°/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.