When is the best time to observe HIP 25187?

HIP 25187 is best observed from November through January, with peak visibility during December when it transits around midnight in the Northern Hemisphere.

Where is HIP 25187 located in the sky?

HIP 25187 lies in the constellation Orion at right ascension 05h 23m and declination -08° 25′.

What telescope do I need to split HIP 25187?

Splitting HIP 25187 requires an aperture of roughly 80 mm or larger — the components are separated by about 6.2″ at magnitudes near 5.9. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 25187 — Double Star in Orion

Observable Double Star Good (58/100)

Sep: 6.2", Companion: mag 8.1

Magnitude 5.9^m DoubleStar Orion (Ori) Visible

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Observe

1Physical Properties

Magnitude 5.90

Spectral Type B8III giant

Star Color Blue-white (B-V -0.03)

Distance 251 ly

2Position & Identifiers

RA 05h 23m 18.5s

Dec -08° 24' 57.0"

Constellation Orion (Ori)

HR 1778

HIP 25187

HD 35281

SAO 132053

Double Cat 3978

SIMBAD

3How easy to split?

Primary 5.9 mag Companion 8.1 mag Separation 6.2″

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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

Separation 6.2″

Companion Mag 8.1

Position Angle 138°

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

Discoverer STF 701

Notes

Companion A5IV, vsini 124k/s.

Separation over time

Measured 1830 → 2019 (189 y)

Separation drift 5.9" → 6.2" (+0.30")

Rate +0.0016" / y

PA drift 146° → 138° (-8°, -0.042°/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.