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Epsilon Aurigae

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description Epsilon Aurigae Overview

Epsilon Aurigae is an eclipsing binary star system situated in the northern constellation of Auriga. The system is composed of an F-type supergiant primary star and a secondary component that consists of a large, opaque disk of dust and gas surrounding a smaller, hotter star. Astronomers have studied it extensively since it features one of the longest known orbital periods of approximately 27 years. During its eclipse, which lasts for nearly two years, the dark disk passes in front of the supergiant, causing a noticeable dip in brightness observable from Earth.

help Epsilon Aurigae FAQ

Why does Epsilon Aurigae stay dim for nearly two years?

An enormous, dark disk passes in front of the visible F-type star and blocks part of its light. Because the disk is so broad, ingress, the main eclipse and recovery together last roughly two years.

What is hidden inside Epsilon Aurigae's eclipsing disk?

The leading model places a hot companion star inside a large disk of gas and dust. Observations indicate that the disk is not completely opaque or structurally uniform, which helps explain changes seen during eclipse.

How often does Epsilon Aurigae eclipse?

Its deep eclipse repeats approximately every 27 years, making each event valuable to professional and amateur observers. The long interval results from the system's unusually extended orbit.

Can Epsilon Aurigae be seen without a telescope?

Yes, Epsilon Aurigae is normally visible to the unaided eye under reasonably dark skies in the constellation Auriga. During an eclipse it fades noticeably, but it does not disappear from naked-eye view.

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