D
Nuclear ForcesUnited Kingdom

Astraea (A21)

Nuclear warheadIn developmentPending verification

Also known as: A21, Mk7

Nuclear ForcesGBR
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Fact cardConfidence · Source
System
TypeNuclear warhead
Alternative designationsA21, Mk7
ProliferationOrigin country only
Program statusConcept phase; transition expected to begin late 2030sMed[1]
Summary

Replacement UK warhead in the Mk7 aeroshell, closely tied to the U.S. W93.

Draft entry. Values come from the cited public sources and are awaiting editor verification.
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Operators
United Kingdom
Sources
  1. United Kingdom nuclear weapons, 2024, Federation of American Scientists Nuclear Notebook, Bulletin of the Atomic Scientists
    Published/updated 2024-11-12 · Tier 2 · checked 2026-11-08
Change log
  • 2026-11-08 Entry created from United Kingdom nuclear weapons, 2024 (FAS Nuclear Notebook)