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Alsephina

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description Alsephina Overview

Delta Velorum, which holds the formal proper name Alsephina, is a prominent star system in the southern constellation of Vela. The primary component is an A-type white subgiant or giant star that forms the brightest point of the False Cross asterism. Alsephina is a binary system, featuring a primary star that experiences periodic eclipses caused by a smaller, unseen companion star. The International Astronomical Union officially approved the name Alsephina for this star in 2016.

help Alsephina FAQ

What is Alsephina's official designation?

Alsephina is the formal proper name of Delta Velorum. It is located in the southern constellation Vela.

Is Alsephina part of the False Cross?

Yes. Delta Velorum is one of the bright stars used to outline the False Cross, an asterism in the southern sky that can be mistaken for the Southern Cross.

Is Alsephina a single star?

No. Delta Velorum is a multiple-star system that includes an eclipsing binary and a more distant companion. The primary visible component is an evolved A-type white star.

Why do astronomers describe Alsephina as an eclipsing system?

An eclipsing binary changes brightness when one component passes in front of the other from Earth's viewpoint. Delta Velorum A contains the close pair responsible for that recurring variation.

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