Star lore
Alpheratz
Direct answer
Alpheratz is Alpha Andromedae, a blue-white star forming the northeastern corner of the Great Square of Pegasus.
Alpheratz is Andromeda's bright gateway and the shared-looking corner of the Great Square.
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At a glance
- Found in
- Constellations & Star Lore
- Related
- Menkar, Diphda, Markab, Scheat
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The story behind Alpheratz
The star once carried the designation Delta Pegasi; modern boundaries assign it exclusively to Andromeda.
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Why Alpheratz matters
Alpheratz provides the primary handoff from Pegasus into Andromeda and demonstrates how asterisms can cross official boundaries.
How to read Alpheratz
Find the Great Square, choose its corner nearest Cassiopeia, and trace eastward from Alpheratz into Andromeda.
Alpheratz in practice: an example
Alpheratz, Mirach, and Almach form the principal chain used to locate M31.
Where readings of Alpheratz go wrong
Being a square corner does not make Alpheratz a current member of the constellation Pegasus.
Sources and editorial method
Research references used for this entry include:
- IAU Division C Working Group on Star Names - Official IAU working group responsible for standardizing star names used in international astronomy.
- CDS SIMBAD Astronomical Database - Professional astronomical database for stellar identifiers, positions, classifications, and bibliography.
- Source
- The Great Almanac Dictionary
- Category
- Constellations & Star Lore
- Last updated
- 2026-09-26
Enter Andromeda through Alpheratz
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Common questions
What is Alpheratz?
Alpheratz is Alpha Andromedae, a blue-white star forming the northeastern corner of the Great Square of Pegasus.
What do people get wrong about Alpheratz?
Being a square corner does not make Alpheratz a current member of the constellation Pegasus.
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