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Image artifacts - Debris
Occasionally one will see bright blobs or streaks appearing in the STEREO
coronagraph images. These have been seen before by the
mission, and are caused by micrometeorite impacts knocking off small pieces of
the multi-layer insulation blankets which are wrapped around the spacecraft.
These small debris particles are brightly illuminated by the Sun, and are
easily seen by the coronagraphs if they wander into the field of view. They
are tremendously out-of-focus, and often appear as "donut" shapes in the COR1
and COR2 telescopes because of the central occulter in these telescopes. The
bigger the piece of debris appears, the closer it is to the telescope.
Because the COR1 and COR2 images are generally built up from a series of
images, the same piece of debris will often show up multiple times.
|Debris event observed by the STEREO Ahead COR1 telescope on
December 23, 2008
||Same event as seen in COR2
|Same event as seen in HI1
||Same event as seen in HI2
Back to image artifacts page.
Last Revised: Monday, 29-Nov-2010 16:49:50 EST
Responsible NASA Official:
Webmaster: Kevin Addison