1. Coordinate Systems Mike A’Hearn & Don Davis

2. Origin of Problem Coordinate system issues for Dawn –Will NOT rehash these issues! SBN Advisory Council urged SBN to be active in dealing with the issue from here on out Uncertainty about role of PDS vis a vis IAU WGCCRE –Draft document circulated Disagreement within SBN on best way forward Should be a PDS-wide position

3. PDS Requirements Follow international standards Specifically, for coordinate systems on bodies in the solar system, follow recommendations of the IAU WG CCRE We have to enforce our own requirements through the peer review process, BUT! Options –Review the definition of the coordinate system if it is “new” or “improved” and also verify that the data are actually in the advertised coordinate system –Require WGCCRE approval of “new” or “improved” systems and verify only that the data are actually in the advertised system –Other approaches?

4. WGCCRE A volunteer group with no resources They can not review all PDS datasets to ensure data are in the advertised coordinate system They normally rely on peer-reviewed publications to decide whether to adopt a new or improved coordinate system –PDS peer review presumably could count as much as a journal peer review Historically, guidelines are updated every triennium

5. WG Pre-Approval Pros –Easier for PDS –PDS better positioned to be good guys –Guaranteed to be consistent with IAU recommendations Cons –WG CCRE does not have the resources for frequent peer reviews –May delay delivery of data to PDS –PDS still must review to ensure data are correctly in the coordinate system –Coordinate system would be documented entirely outside PDS

6. PDS Review of System Pros –PDS enforces its own requirements –PDS can act expeditiously –PDS funded to define and maintain standards for all archiving functions Cons –More opportunity for PDS to be seen as the bad guys –Additional work in peer reviews –IAU WG MIGHT later decide to reject the coordinate system

7. Proposal Small committee of PDS and WGCCRE to clarify each other’s roles and recommend what should be reviewed by PDS Report back by next MC f2f Membership TBD –PDS: A’Hearn, Davis, Gaddis, other? –WGCCRE: Archinal, others? (to be appointed in consultation with Archinal, e.g. P. Thomas)