C/2013 A1 is passing Mars today at ~139,500 km. About 16x closer than any comet we’ve ever observed.
I spent the day shooting the MMS at the NASA Goddard Space Flight Center yesterday. Full edit to come.
Obsessing over Jack Delano's FSA and OWI 4x5 transparencies. Most of which you can download 1800 dpi TIFs of on the LOC site.