When is the best time to observe HIP 36817?

HIP 36817 is best observed from December through February, with peak visibility during January when it transits around midnight in the Northern Hemisphere.

Where is HIP 36817 located in the sky?

HIP 36817 lies in the constellation Puppis at right ascension 07h 34m and declination -23° 28′.

What telescope do I need to split HIP 36817?

Splitting HIP 36817 requires an aperture of roughly 80 mm or larger — the components are separated by about 9.9″ at magnitudes near 5.8. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 36817 — Double Star in Puppis

Observable Double Star Excellent (67/100)

Sep: 9.9", Companion: mag 5.8

Magnitude 5.8^m DoubleStar Puppis (Pup) Visible

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Observe

1Physical Properties

Magnitude 5.83

Spectral Type dF4

Star Color Yellow-white (B-V 0.44)

Distance 142 ly

2Position & Identifiers

RA 07h 34m 18.6s

Dec -23° 28' 25.0"

Constellation Puppis (Pup)

HR 2909

HIP 36817

HD 60585

SAO 174020

Double Cat 6190

SIMBAD

3How easy to split?

Primary 5.8 mag Companion 5.9 mag Separation 9.9″

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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 Dec – Feb (peak: Jan)

5Multiple Star System

Separation 9.9″

Companion Mag 5.8

Position Angle 118°

Star Colors A: Yellow-white B: Yellow-white

Discoverer H N 19

Notes

Binary with HR 2910. Colors for combined light. Magnitude of blended images 5.09V.

Separation over time

Measured 1825 → 2016 (191 y)

Separation drift 9.0" → 9.9" (+0.90")

Rate +0.0047" / y

PA drift 105° → 118° (+13°, +0.068°/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.