Arecibo Observatory's Greatest Triumphs

A Revised Year on Mercury

NASA’s Mariner 10 spacecraft captured this photo of Mercury in 1974. Image: NASA/JLP

Arecibo’s first major discovery came in 1967, when data gathered by the radio telescope showed that a year on Mercury is 59 days long, not 88 days as previously assumed.

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$A bright, greenish coma and a tail are shown in this three-minute exposure taken using a 6″ Takahashi refractor located in New Mexico. At the time of this image, comet Lovejoy was 40 million miles from Earth and 88 million miles from the sun.$

A Revised Year on Mercury

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