KPL/FK CASSINI Dynamic Frame Definitions -- Rings Working Group Frames =========================================================================== This temporary frames kernel contains dynamic frame definitions proposed for inclusion in the CAS SPICE PDS archive by the Rings Working Group chaired by Jeff Boyer, JPL. Once agreed upon, these frames will be moved to the CAS Dynamic Frames FK (cas_dyn_vVV.tf). Version and Date --------------------------------------------------------------- Version 0.0 -- December 11, 2017 -- Boris Semenov Initial release. References --------------------------------------------------------------- 1. "Kernel Pool Required Reading" 2. "Frames Required Reading" 3. "Rings Into SPICE, Phase 1", Jeff Boyer, 2017-09-13, SPICEyRings-PSG73-ws.docx 4. "Solar Hour Angle (SHA) Code Sets", Jeff Boyer: MSAUL-278, A.I., 2017-10-20, CAS_SHA_CodeSets-JSB_MSAUL-278-AI.pdf Contact Information --------------------------------------------------------------- Direct questions, comments, or concerns about the contents of this kernel to: Boris Semenov, NAIF/JPL, Boris.Semenov@jpl.nasa.gov Implementation Notes --------------------------------------------------------------- This file is used by the SPICE system as follows: programs that make use of this frame kernel must "load" the kernel using SPICE's FURNSH routine, normally during program initialization. Loading the kernel associates the data items with their names in a data structure called the "kernel pool". This file was created and may be updated with a text editor or word processor. Frames Defined in This Kernel --------------------------------------------------------------- The following frames are defined in this kernel file: Frame Name Relative To Type NAIF ID ======================= =================== ======= ======= Dynamic Frames: ------------------ CASSINI_RINGS_PLANNING J2000 DYNAMIC -82906 CASSINI_RINGS_SHA J2000 DYNAMIC -82907 CASSINI_RINGS_PLANNING --------------------------------------------------------------- The CASSINI_RINGS_PLANNING frame facilitates calculation of the ring longitude used in the CASSINI project planning/targeting tools. The CASSINI_RINGS_PLANNING frame is defined as follows (per section 1 in [3]): +Z is along the Saturn pole (+Z of IAU_SATURN.) +Y is in the direction of the J2000 pole (+Z of J2000.) +X completes the right-handed frame (is along the ascending node of the Saturn equator on the J2000 equator..) origin is at the center of Saturn. The ring longitude of a point is its planetographic (west-positive) longitude in this frame, computed by RECPGR for BODY='SATURN'. This set of keywords defines the CASSINI_RINGS_PLANNING frame. \begindata FRAME_CASSINI_RINGS_PLANNING = -82906 FRAME_-82906_NAME = 'CASSINI_RINGS_PLANNING' FRAME_-82906_CLASS = 5 FRAME_-82906_CLASS_ID = -82906 FRAME_-82906_CENTER = 699 FRAME_-82906_RELATIVE = 'J2000' FRAME_-82906_DEF_STYLE = 'PARAMETERIZED' FRAME_-82906_FAMILY = 'TWO-VECTOR' FRAME_-82906_PRI_AXIS = 'Z' FRAME_-82906_PRI_VECTOR_DEF = 'CONSTANT' FRAME_-82906_PRI_SPEC = 'RECTANGULAR' FRAME_-82906_PRI_VECTOR = ( 0.0, 0.0, 1.0 ) FRAME_-82906_PRI_FRAME = 'IAU_SATURN' FRAME_-82906_SEC_AXIS = 'Y' FRAME_-82906_SEC_VECTOR_DEF = 'CONSTANT' FRAME_-82906_SEC_SPEC = 'RECTANGULAR' FRAME_-82906_SEC_VECTOR = ( 0.0, 0.0, 1.0 ) FRAME_-82906_SEC_FRAME = 'J2000' \begintext CASSINI_RINGS_SHA --------------------------------------------------------------- The CASSINI_RINGS_SHA frame facilitates calculation of the solar hour angle (SHA) used in the CASSINI project planning/targeting tools. The CASSINI_RINGS_SHA frame is defined as follows (based on PDT Calculate_Solar_Hour_Angle function from [4]): +Z is along the Saturn pole (+Z of IAU_SATURN.) -X is in the direction of the apparent position of the Sun. +Y completes the right-handed frame. origin is at the center of Saturn. The solar hour angle of a point is its planetographic (west-positive) longitude in this frame, computed by RECPGR for BODY='SATURN'. This set of keywords defines the CASSINI_RINGS_SHA frame. \begindata FRAME_CASSINI_RINGS_SHA = -82907 FRAME_-82907_NAME = 'CASSINI_RINGS_SHA' FRAME_-82907_CLASS = 5 FRAME_-82907_CLASS_ID = -82907 FRAME_-82907_CENTER = 699 FRAME_-82907_RELATIVE = 'J2000' FRAME_-82907_DEF_STYLE = 'PARAMETERIZED' FRAME_-82907_FAMILY = 'TWO-VECTOR' FRAME_-82907_PRI_AXIS = 'Z' FRAME_-82907_PRI_VECTOR_DEF = 'CONSTANT' FRAME_-82907_PRI_SPEC = 'RECTANGULAR' FRAME_-82907_PRI_VECTOR = ( 0.0, 0.0, 1.0 ) FRAME_-82907_PRI_FRAME = 'IAU_SATURN' FRAME_-82907_SEC_AXIS = '-X' FRAME_-82907_SEC_VECTOR_DEF = 'OBSERVER_TARGET_POSITION' FRAME_-82907_SEC_OBSERVER = 'SATURN' FRAME_-82907_SEC_TARGET = 'SUN' FRAME_-82907_SEC_ABCORR = 'LT+S' \begintext End of FK file.