The Heliospheric Imager for the NASA STEREO Mission
Part of the SECCHI Consortium
Behind Recovery Attempts
As the geometry becomes more favourable attempts are now being made to recontact the behind spacecraft every three days and will increase again between August 21-27 between daily and every other day. In anticipation of a succesful contact there will be a meeting to ensure the support systems are ready to recover the spacecraft to return to operation scheduled for August 29.
NASA 10 year retrospective on STEREO
See their website celebrating 10 years of STEREO and the science that has been done so far. NASA
This image, from the RAL Space-led HI-2 camera on STEREO-A, shows the result of a micrometeor impact on the spacecraft on May 6, 2016.
A small dust particle hitting the thermal blanket sends out a spray of debris.
Although such impacts are common, in this case the camera was returning short time-scale exposures so the signature is clearer than usual.
Even with an exposure time of 50 seconds, ejected particles show up as streaks.
Such signatures have been used to determine dust distributions at 1 AU.