STEREO - Solar Terrestrial Relations Observatory
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Mercury transit observed by COR1-A


This movie shows the planet Mercury crossing in front of the solar corona on October 27, 2007, as seen by the COR1 telescope on the STEREO Ahead spacecraft. This is known as a planetary transit. Mercury is so small that this event was not initially noticed in the data, and was only discovered when an analysis was done of the STEREO and planetary orbits looking for possible transit events.

Last Revised: February 22, 2022 21:33:36 UTC
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