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Alpheratz

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description Alpheratz Overview

Alpheratz, officially designated as Alpha Andromedae, is a bright binary star system marking the northeast corner of the Great Square of Pegasus asterism. Historically, the star was also designated as Delta Pegasi due to its shared location on the conceptual border between the Pegasus and Andromeda constellations. The primary star is a hot B-type subgiant that rotates rapidly, generating a surrounding ring of diffuse gas. Astronomers frequently study Alpheratz to understand the complex chemical peculiarities and atmospheric behaviors of early-type stars.

help Alpheratz FAQ

What constellation does the star Alpheratz belong to?

Alpheratz is the brightest star in the constellation Andromeda and holds the formal designation Alpha Andromedae. However, it is famously located right on the border between Andromeda and the constellation Pegasus.

What is Alpheratz's connection to the Great Square of Pegasus?

Alpheratz forms the northeast corner of the prominent asterism known as the Great Square of Pegasus. It acts as a vital navigational guidepost, helping skywatchers locate both the Pegasus and Andromeda constellations.

Did Alpheratz used to have a different name?

Historically, because it shared the border with Pegasus, Alpheratz was also officially recognized as Delta Pegasi. Today, standardization by the International Astronomical Union permanently assigns it to the Andromeda constellation.

What type of star is Alpheratz?

Alpheratz is a binary star system dominated by a blue-white subgiant star. It is also notable for having an unusually high concentration of mercury and manganese in its atmosphere, making it chemically peculiar.

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