When is the best time to observe HIP 40285?

HIP 40285 is best observed from December through February, with peak visibility during January when it transits around midnight in the Northern Hemisphere.

Where is HIP 40285 located in the sky?

HIP 40285 lies in the constellation Vela at right ascension 08h 14m and declination -46° 60′.

What telescope do I need to split HIP 40285?

Splitting HIP 40285 requires an aperture of roughly 60 mm or larger — the components are separated by about 34.8″ at magnitudes near 5.1. The companion is about 4.9 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 40285 — Double Star in Vela

Magnitude 5.1^m DoubleStar Vela (Vel) Visible

Star Map + List + Plan Star Hop

Observe

1Physical Properties

Magnitude 5.13

Spectral Type B2.5IV subgiant

Star Color Blue-white (B-V -0.14)

2Position & Identifiers

RA 08h 13m 36.2s

Dec -46° 59' 31.0"

Constellation Vela (Vel)

HR 3244

HIP 40285

HD 69144

SAO 219629

Variable ID Var

SIMBAD

3How easy to split?

Primary 5.1 mag Companion 10.1 mag Separation 34.8″

Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Medium+	Medium	Hard+
150 mm Newton 150mm Newt.	Easy	Easy	Medium+
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 34.8″

Companion Mag 10.1

Position Angle 344°

Star Colors A: Blue-white B: Yellow

Discoverer GLI 87

Notes

Companion K5V, RV +7k/s, optical.

Separation over time

Measured 1852 → 2010 (158 y)

Separation drift 36.4" → 34.8" (-1.60")

Rate -0.0101" / y

PA drift 344° → 344° (+0°, +0.000°/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.