Important notice about the deactivation of the STEREO ftp
Important notice about the STEREO redirects
Important notice about STEREO Behind
Farewell Comet ISON
The STEREO Ahead spacecraft was in a great position to observe Comet ISON as it raced to its closest passage by the Sun (Nov. 28 - 29, 2013). It featured a brilliantly elongated tail as it passed the coronagraphâs occulting disk (within 1 million km). Then, it apparently broke up into smaller pieces that continued on its orbit path, much reduced in brightness and with little tail. Hopes that it would become a very bright comet were dashed. the comet is still visible in Ahead HI1, and we will continue to observe it as long as we can. (Lower left bright object is Mercury.) Credit: STEREO/NASA.
Last Revised: June 11, 2020 19:27:39 UTC
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Webmaster: Kevin Addison