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First Observation of Sirius B
- When
- 31 January 1862
- Where
- Cambridgeport, Massachusetts
Alvan Graham Clark observed Sirius B on 31 January 1862 using an 18.5-inch refractor in Cambridgeport, Massachusetts.
Clark made the first ever observation of a white dwarf star, Sirius B, while testing a new 18.5-inch aperture great refractor telescope. The observation took place in Cambridgeport, Massachusetts, not Evanston, Illinois, as previously recorded.
Sources
- Alvan Graham Clark Wikipedia, revision of 2026-09-06
- Sirius B Wikipedia, revision of 2026-09-27
Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.