description Alpheratz Overview
Alpheratz (Alpha Andromedae) was historically shared between Andromeda and Pegasus as Delta Pegasi, forming a corner of the Great Square of Pegasus.
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Alpheratz ranks #76 of 217 in the Star ranking, behind Adhara, ahead of Izar.
Great Square corner, Andromeda-Pegasus historical identity, bright chemically peculiar star with strong recognition.
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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