Comet ISON entered STEREO Ahead HI1 field of view

Comet ISON entered STEREO Ahead HI1 field of view

Comet ISON entered STEREO Ahead HI1 field of view. First image was taken at 21:34 UTC on November 20, 2013. Both STEREO spacecraft will have a view of the comet in the COR1 and COR2 coronagraphs in the hours around closest approach on November 28.

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