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Markeb — Star in Vela

Kappa Vel

Magnitude 2.5m Star Vela (Vel) Visible
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About Markeb

Description

Kappa Velorum is a blue-white star of spectral type B2IV-V at magnitude 2.50, located roughly 540 light-years from Earth. It is a spectroscopic binary system with an orbital period of about 116 days. With a combined luminosity of several thousand times solar, it is one of the more distant naked-eye stars. Kappa Vel is a member of the False Cross asterism.

Observing Tips

Kappa Vel is a prominent southern-hemisphere star forming part of the False Cross along with Iota Car, Delta Vel, and Epsilon Car. It appears as a bright blue-white star in a rich region of the southern Milky Way. Best observed from January through May. The False Cross is often mistaken for the true Southern Cross, but it is larger and more symmetric.

History

Kappa Vel has no traditional proper name. Like all stars in Vela, it was originally part of the vast constellation Argo Navis (the Ship of the Argonauts), which was subdivided by Nicolas Louis de Lacaille in 1763 into Carina (the Keel), Puppis (the Stern), and Vela (the Sails).

Fun Facts

The False Cross, of which Kappa Vel is a member, has been the bane of navigators for centuries. Many a sailor in the southern seas has confused it with Crux and consequently made navigation errors. The False Cross is about twice the size of the true Southern Cross.

Observe

1Physical Properties

Magnitude 2.50
Spectral Type B2IV subgiant
Star Color Blue (B-V -0.18)
Distance 570 ly

2Position & Identifiers

RA 09h 22m 06.8s
Dec -55° 00' 39.0"
Constellation Vela (Vel)
HR 3734
HIP 45941
HD 81188
SAO 236891
Bayer Kappa

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Easy Easy Easy
50mm finder Easy Easy Easy
150mm scope 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)

5Survey Image

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Explore

7

Size Comparison

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Compare Stars

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Spectral Classification

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Hertzsprung-Russell Diagram

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Stellar Lifecycle

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Blackbody Spectrum

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Stellar Absorption Spectrum

Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.

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Stellar Fusion

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15Stellar Notes

116.65d, K 46.5k/s, V0 +21.9k/s, asini 73.2.
Sco-Cen assoc.
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Light Travel Time Machine

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Relativistic Travel

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