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and Coordinate Systems - NASA

Navigation and Ancillary Information FacilityNIFAn Overview ofReference FramesandCoordinate Systemsin the SPICE ContextJanuary 2020 Navigation and Ancillary Information FacilityNIFP urpose of this Tutorial This tutorial provides an overviewof reference frames and Coordinate Systems . It contains conventions specific to SPICE. Details about the SPICE Frames Subsystem are found in other tutorials and one document: FK (tutorial) Using Frames (tutorial) Dynamic Frames (advanced tutorial) Frames Required Reading (technical reference) Details about SPICE Coordinate Systems are found in API module headers for Coordinate conversion and Coordinate Systems 2 Navigation and Ancillary Information FacilityNIFA Challenge Next to time, the topics of reference frames and Coordinate Systems present some of the largest challenges to documenting and understanding observation geometry.

•Dwarf planets*, asteroids and comets spin in the right hand sense about their “positive pole.” –What the IAU now calls the “positive pole” is still referred to as the “north pole” in SPICE documentation. –The “positive pole” may point above or below the – • –

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