When is the best time to observe HIP 12057?

HIP 12057 is best observed from September through November, with peak visibility during October when it transits around midnight in the Northern Hemisphere.

Where is HIP 12057 located in the sky?

HIP 12057 lies in the constellation Andromeda at right ascension 02h 35m and declination +39° 40′.

What telescope do I need to split HIP 12057?

Splitting HIP 12057 requires an aperture of roughly 60 mm or larger — the components are separated by about 14.8″ at magnitudes near 6.4. The companion is about 4.8 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 12057 — Double Star in Andromeda

Magnitude 6.4^m DoubleStar Andromeda (And) Visible

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Observe

1Physical Properties

Magnitude 6.36

Spectral Type B9pHgMn

Star Color Blue-white (B-V -0.10)

2Position & Identifiers

RA 02h 35m 27.9s

Dec +39° 39' 52.0"

Constellation Andromeda (And)

HR 746

HIP 12057

HD 16004

SAO 55680

Double Cat 1961

SIMBAD

3How easy to split?

Primary 6.4 mag Companion 11.2 mag Separation 14.8″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Hard+	Hard	V. hard+
150 mm Newton 150mm Newt.	Medium+	Medium	Hard+
Celestron C8 (203 mm SCT) C8 203mm	Easy	Medium+	Medium

Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

4Visibility

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Best season Sep – Nov (peak: Oct)

5Multiple Star System Triple optical

Components 3 (triple)

Component IDs AB

Separation 14.8″

Companion Mag 11.2

Position Angle 73°

Star Colors A: Blue-white B: Yellow

Discoverer HJ 1120

Notes

Companions optical.

Separation over time

Measured 1828 → 2016 (188 y)

Separation drift 15.0" → 14.8" (-0.20")

Rate -0.0011" / y

PA drift 100° → 73° (-27°, -0.144°/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.