When is the best time to observe HIP 42570?

HIP 42570 is best observed from December through February, with peak visibility during January when it transits around midnight in the Northern Hemisphere.

Where is HIP 42570 located in the sky?

HIP 42570 lies in the constellation Vela at right ascension 08h 41m and declination -46° 39′.

What telescope do I need to split HIP 42570?

Splitting HIP 42570 requires an aperture of roughly 60 mm or larger — the components are separated by about 37.2″ at magnitudes near 3.8. The companion is about 6.5 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 42570 — Double Star in Vela

Magnitude 3.8^m DoubleStar Vela (Vel) Visible

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1Physical Properties

Magnitude 3.84

Spectral Type F0Ia supergiant

Star Color Orange (B-V 0.71)

Distance 4,868 ly

2Position & Identifiers

RA 08h 40m 37.6s

Dec -46° 38' 56.0"

Constellation Vela (Vel)

HR 3445

HIP 42570

HD 74180

SAO 220265

SIMBAD

3How easy to split?

Primary 3.8 mag Companion 10.3 mag Separation 37.2″

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

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 37.2″

Companion Mag 10.3

Position Angle 58°

Star Colors A: Orange

Discoverer HJ 4127

Separation over time

Measured 1835 → 2015 (180 y)

Separation drift 30.0" → 37.2" (+7.20")

Rate +0.0400" / y

PA drift 58° → 58° (+0°, +0.000°/y)

Apparent motion is significant on a human timescale — worth revisiting in a decade.

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.