When is the best time to observe KL Velorum?

KL Velorum is best observed from January through March, with peak visibility during February when it transits around midnight in the Northern Hemisphere.

Where is KL Velorum located in the sky?

KL Velorum lies in the constellation Vela at right ascension 09h 13m and declination -43° 37′.

What telescope do I need to split KL Velorum?

Splitting KL Velorum requires an aperture of roughly 100 mm or larger — the components are separated by about 2.9″ at magnitudes near 5.6. Larger apertures and steady seeing help resolve the pair cleanly.

KL Velorum — Double Star in Vela

Observable Double Star Good (56/100)

Sep: 2.9", Companion: mag 6.8

DoubleStar Vela (Vel) Visible

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Observe

1Physical Properties

Magnitude 5.57

Range 5.56 - 5.57

Period 2.9 days

Variable Type Slowly Pulsating B Star

Spectral Type B8Vp:Si:

Star Color Blue-white (B-V -0.11)

Distance 652 ly

2Position & Identifiers

RA 09h 12m 30.6s

Dec -43° 36' 49.0"

Constellation Vela (Vel)

HR 3661

HIP 45189

HD 79416

Variable ID KL Vel

SIMBAD

3How easy to split?

Primary 5.6 mag Companion 6.8 mag Separation 2.9″

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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 Jan – Mar (peak: Feb)

5Light Curve

6Multiple Star System Triple

Components 3 (triple)

Component IDs ABxC

Separation 2.9″

Companion Mag 6.8

Position Angle 281°

Star Colors A: Blue-white

Discoverer HJ 4188

Notes

AB 6.7, 7.2v sep. 0.11". Combined mag., colors of ABC.

Separation over time

Measured 1835 → 2023 (188 y)

Separation drift 3.1" → 2.9" (-0.20")

Rate -0.0011" / y

PA drift 287° → 281° (-6°, -0.032°/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.