HD 1, also known as HIP 422, is a star in the Henry Draper Catalogue.
HD1 or HD 1 may also refer to:
- HD1, the oldest and most distant known galaxy yet identified in the observable universe.
- Plectin, a giant protein found in mammalian cells, for which HD1 is an alias.
- TF1 Séries Films, formerly known as HD1.
See also
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This disambiguation page lists articles associated with the title HD1.
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