When is the best time to observe HIP 29151?

HIP 29151 is best observed from November through January, with peak visibility during December when it transits around midnight in the Northern Hemisphere.

Where is HIP 29151 located in the sky?

HIP 29151 lies in the constellation Orion at right ascension 06h 09m and declination +02° 30′.

What telescope do I need to split HIP 29151?

Splitting HIP 29151 requires an aperture of roughly 60 mm or larger — the components are separated by about 29.1″ at magnitudes near 5.7. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 29151 — Double Star in Orion

Observable Double Star Excellent (65/100)

Sep: 29.1", Companion: mag 6.7

Magnitude 5.7^m DoubleStar Orion (Ori) Visible

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Observe

1Physical Properties

Magnitude 5.73

Variable Type Eclipsing Binary (Algol-type)

Spectral Type A3Vn

Star Color White (B-V 0.07)

2Position & Identifiers

RA 06h 08m 57.9s

Dec +02° 29' 58.0"

Constellation Orion (Ori)

HR 2174

HIP 29151

HD 42111

SAO 113507

Double Cat 4749

SIMBAD

3How easy to split?

Primary 5.7 mag Companion 6.7 mag Separation 29.1″

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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 Nov – Jan (peak: Dec)

5Multiple Star System Triple C: optical

Components 3 (triple)

Component IDs AB

Separation 29.1″

Companion Mag 6.7

Companion Sp A0V

Position Angle 115°

Star Colors A: White B: Blue-white

Discoverer STF 855

Notes

AB CPM. B is 6.94V, +0.04(B-V), -0.02(U-B), A0V, vsini 120k/s. Component C, 8.9v at 118". HD erroneously assigned the | preceding number, HD 42092, to the fainter following component of ADS 4749. Consequently the data for the two primary | components are sometimes interchanged. vsini for component A is 250k/s.

Separation over time

Measured 1824 → 2019 (195 y)

Separation drift 29.2" → 29.1" (-0.10")

Rate -0.0005" / y

PA drift 113° → 115° (+2°, +0.010°/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.