When is the best time to observe HIP 11578?

HIP 11578 is best observed from September through November, with peak visibility during October when it transits around midnight in the Northern Hemisphere.

Where is HIP 11578 located in the sky?

HIP 11578 lies in the constellation Aries at right ascension 02h 29m and declination +23° 28′.

What telescope do I need to split HIP 11578?

Splitting HIP 11578 requires an aperture of roughly 60 mm or larger — the components are separated by about 217.5″ at magnitudes near 6.2. The companion is about 3.4 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 11578 — Double Star in Aries

Magnitude 6.2^m DoubleStar Aries (Ari) Visible

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Observe

1Physical Properties

Magnitude 6.19

Spectral Type A5m

Star Color Yellow-white (B-V 0.15)

2Position & Identifiers

RA 02h 29m 13.6s

Dec +23° 28' 08.0"

Constellation Aries (Ari)

HR 723

HIP 11578

HD 15385

SAO 75398

SIMBAD

3How easy to split?

Primary 6.2 mag Companion 9.6 mag Separation 217.5″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Medium+	Medium+	Medium
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 Sep – Nov (peak: Oct)

5Multiple Star System

Separation 217.5″

Companion Mag 9.6

Position Angle 323°

Star Colors A: Yellow-white B: Yellow

Discoverer HJL1019

Separation over time

Measured 1891 → 2016 (125 y)

Separation drift 218.3" → 217.5" (-0.80")

Rate -0.0064" / y

PA drift 322° → 323° (+1°, +0.008°/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.