When is the best time to observe HIP 75809?

HIP 75809 is best observed from April through June, with peak visibility during May when it transits around midnight in the Northern Hemisphere.

Where is HIP 75809 located in the sky?

HIP 75809 lies in the constellation Ursa Minor at right ascension 15h 29m and declination +80° 27′.

What telescope do I need to split HIP 75809?

Splitting HIP 75809 requires an aperture of roughly 60 mm or larger — the components are separated by about 31.6″ at magnitudes near 6.6. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 75809 — Double Star in Ursa Minor

Magnitude 6.6^m DoubleStar Ursa Minor (UMi) Visible

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Observe

1Physical Properties

Magnitude 6.58

Spectral Type G0IV-V+G8IV-V subgiant

Star Color Yellow (B-V 0.67)

Distance 84 ly

2Position & Identifiers

RA 15h 29m 11.0s

Dec +80° 26' 55.0"

Constellation Ursa Minor (UMi)

HR 5829

HIP 75809

HD 139777

SAO 2556

Double Cat 9696

SIMBAD

3How easy to split?

Primary 6.6 mag Companion 7.3 mag Separation 31.6″

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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 Apr – Jun (peak: May)

5Multiple Star System Triple C: optical

Components 3 (triple)

Component IDs AB

Separation 31.6″

Companion Mag 7.3

Companion Sp G9V

Position Angle 79°

Star Colors A: Yellow B: Orange

Discoverer STF1972

Notes

AB binary, B, 8.5 G8IV-V; C, 11.4 at 135".

Separation over time

Measured 1782 → 2018 (236 y)

Separation drift 26.4" → 31.6" (+5.20")

Rate +0.0220" / y

PA drift 87° → 79° (-8°, -0.034°/y)

Apparent motion is significant on a human timescale — worth revisiting in a decade.

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.