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MCQIntermediateTelescopes, Instruments & Observing
BAAO — 2016 Astronomy & Astrophysics A2 Challenge
Question 10
On 5th September 2016, the Rosetta mission finally found the Philae lander on Comet 67P/Churyumov-Gerasimenko. Considering that Philae (1 × 1 × 1 m) appeared in an image from the high-resolution camera (with 2048 × 2048 pixels and field of view 2.2° × 2.2°) as 25 × 25 pixels, from what distance did Rosetta manage to image Philae?
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Source
Source: British Astronomy and Astrophysics Olympiad (BAAO), Astronomy & Astrophysics A2 Challenge 2016. Question text, answer-choice text, and answer were transcribed from the official BAAO paper and solutions PDFs; the explanation and metadata are original.