Status Report

NASA Astrophysics Explorer Solicitations Amended on June 11, 2019

By SpaceRef Editor
June 11, 2019
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On June 11, 2019, the National Aeronautics and Space Administration (NASA) Science Mission Directorate (SMD) released amendments to two solicitations for Astrophysics Explorers Science Investigations originally released April 3, 2019.


1. Solicitation Number: NNH19ZDA011O (Small Explorer AO) Amendment 1- Clarifies/Corrects a series of typographical errors resulting from a misplaced designation for Requirement 97. The AO has 100 Requirements not 101 as originally published.


2. Solicitation Number: NNH17ZDA004O-APEXMO (Amendment 15 to the SALMON-3 AO: NNH17ZDA004O) Defers to Step-2 the requirement for a data analysis plan.  In addition, language is added to clarify that investigations may propose to use small amounts of radioactive materials.


NASA released these amendments to the 2019 Astrophysics Small Explorer Announcement of Opportunity (NNH19ZDA011O) as Amendment 1, and the 2019 Astrophysics Explorers Mission of Opportunity (MO) Program Element Appendix O (PEA-O) (NNH17ZDA004O-APEXMO) as Amendment 15 to the NASA Third Stand Alone Missions of Opportunity Notice (SALMON-3) Announcement of Opportunity NNH17ZDA004O.


NSPIRES is the official NASA source for the full text of these amendments, solicitations and all appendices, therefore please visit:


For both solicitations, the Proposal Due Dates are unchanged and remain: 11:59 pm Eastern August 1, 2019


Comments and questions may be addressed by E-mail to the Astrophysics Explorers Program Scientist Dr. Linda S. Sparke, at (subject line to read “Astrophysics Explorers SMEX AO” or “Astrophysics Explorers MO PEA” as appropriate).


Responses to all inquiries will be posted at the Questions and Answers (QAs) location of the Astrophysics Explorers Program Acquisition website at The period for questions/comments will close three weeks before the proposal due date, and the period for responses will close ten days before the proposal due date. Anonymity of persons/institutions who submit questions will be preserved.


SpaceRef staff editor.