Classifier Instance:

Anchor text: Dearborn Observatory
Target Entity: Dearborn_Observatory
Preceding Context: In 1844 German astronomer Friedrich Bessel deduced from changes in the proper motion of Sirius that it had an unseen companion. Nearly two decades later, on January 31, 1862, American telescope-maker and astronomer Alvan Graham Clark first observed the faint companion, which is now called Sirius B, or affectionately "the Pup". This happened during testing of a aperture great refractor telescope for
Succeeding Context: , which was the largest refracting telescope lens in existence at the time, and the largest telescope in America.
Paragraph Title: Discovery of a companion
Source Page: Sirius

Ground Truth Types:

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Predicted Types:

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