The Planetary Science Division (PSD) conducts periodic Senior Reviews to evaluate extended mission proposals. In the past, these reviews were held every two years. Now, in accordance with new guidance, the Senior Review cadence is every three years. NASA conducted a Planetary Mission Senior Review (PMSR) of six operating missions in May 2019. Several missions were exempt from the 2019 review either because they were still in their prime- or extended-mission science phase, or they were before their estimated completion date of download of science data from the spacecraft. As a result, PSD intends to conduct a gap-filler PMSR in 2020 to resynchronize these missions with our now normal three-year cadence of review.
PSD will hold its next PMSR in FY20 to evaluate proposals for extended missions planning to operate in FY21through FY22. Missions that have arrived at a target destination by the end of FY19, and which plan to complete prime operations and downlink before the end of FY20, will be subject to this review. Missions that do not meet these criteria, or have been previously approved through their end of mission, may be subject to the 2022 PMSR.