Status Report

NASA Heliophysics Explorers Program 2019 Medium-Class Explorer (MIDEX) Announcement of Opportunity NNH19ZDA013O Amendment #1

By SpaceRef Editor
July 23, 2019
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The National Aeronautics and Space Administration (NASA) Science Mission Directorate (SMD) has released an amendment to the Announcement of Opportunity (AO) entitled: Announcement of Opportunity (AO) for 2019 Heliophysics Medium-Class Explorer (MIDEX). The full AO, including Amendment #1, is available at by searching on NNH19ZDA013O.


NSPIRES is the official NASA source for the 2019 Heliophysics MIDEX AO. This email is not a complete or verbatim summary of Amendment #1:  “Removal of the Full Limitation on Participation by the Aerospace Corporation (Aerospace)”; therefore it is necessary to visit NSPIRES and download the AO.


The date for the mandatory Notice of Intent (NOI) to propose remains August 2, 2019, 11:59 pm Eastern.  All other dates also remain unchanged.


Comments/Questions will be accepted by email only with the subject line to read “2019 Heliophysics MIDEX” addressed to


Responses to comments/questions will be posted on the website of the Science Office for Mission Assessments (SOMA) of NASA Langley Research Center (LaRC) at the 2019 Heliophysics MIDEX Acquisition Pages. Anonymity of persons/institutions who submit comments will be preserved


SpaceRef staff editor.