Star lore
Deneb
Direct answer
Deneb is Alpha Cygni, an extremely luminous blue-white supergiant marking the tail of Cygnus and one corner of the Summer Triangle.
Deneb is Cygnus's distant supergiant and the top of the Northern Cross.
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At a glance
- Found in
- Constellations & Star Lore
- Related
- Achernar, Altair, Pollux, Castor
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The story behind Deneb
Deneb’s Arabic-derived name means tail and belongs to a family of stellar names marking animal tails.
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Why Deneb matters
Deneb looks comparable to nearby bright stars despite being vastly farther away, revealing its extraordinary intrinsic luminosity.
How to read Deneb
Find Deneb at the Milky Way end of the Summer Triangle, then trace the Northern Cross through Sadr to Albireo.
Deneb in practice: an example
Deneb remains a first-magnitude star even though its light travels for well over a thousand years.
Where readings of Deneb go wrong
Deneb’s exact distance has historically been difficult to determine, so luminosity estimates carry uncertainty.
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
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Common questions
What is Deneb?
Deneb is Alpha Cygni, an extremely luminous blue-white supergiant marking the tail of Cygnus and one corner of the Summer Triangle.
What does the name Deneb mean?
Deneb’s Arabic-derived name means tail and belongs to a family of stellar names marking animal tails.
What do people get wrong about Deneb?
Deneb’s exact distance has historically been difficult to determine, so luminosity estimates carry uncertainty.
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