KPL/IK HERA Asteroid Spectral Imager Instrument kernel ============================================================================== This instrument kernel (I-kernel) contains the Juventas Radar (JURA) detector and field-of-view parameters. Version and Date ------------------------------------------------------------------------------ Version 0.0 -- May 8, 2023 -- Alfredo Escalante Lopez, ESAC/ESA Initial release. References ------------------------------------------------------------------------------ 1. ``Kernel Pool Required Reading'' 2. ``C-kernel Required Reading'' 3. Hera Frames Definition Kernel (FK), latest version. 4. Juventas Spacecraft Frames Kernel (FK), latest version. 5. ``Juventas Cubesat Instruments'', https://www.heramission.space/hera-mission-juventas-cubesat Implementation Notes ------------------------------------------------------------------------------ Applications that need SPICE I-kernel data must ``load'' the I-kernel file, normally during program initialization. Loading the kernel using the SPICELIB routine FURNSH causes the data items and their associated values present in the kernel to become associated with a data structure called the ``kernel pool''. The application program may then obtain the value(s) for any IK data item using the SPICELIB routines GDPOOL, GIPOOL, GCPOOL. Routine GETFOV may be used if the file contains instrument field-of-view (FOV) specification. See [1] for details. This file was created with, and can be updated with a text editor or word processor. Conventions for Specifying Data ------------------------------------------------------------------------------ Data items are specified using ``keyword=value'' assignments [1]. All keywords referencing values in this I-kernel start with the characters `INS' followed by the NAIF HERA instrument ID code, constructed using the spacecraft ID number (-15513) followed by the NAIF three digit ID number. The ID numbers are defined in [4] as follows: Instrument name ID -------------------- --------- JUVENTAS_JURA -15513110 The remainder of the keyword is an underscore character followed by the unique name of the data item. For example, the boresight of JURA is specified by INS-15513110_BORESIGHT The upper bound on the length of all keywords is 32 characters. If a keyword is included in more than one file, or if the same keyword appears more than once within a single file, the last assignment supersedes any earlier assignments. Overview ------------------------------------------------------------------------------ From [5]: JuRa is a monostatic radar, BPSK coded at 60MHz carrier frequency and 20MHz bandwidth, inherited from CONSERT of Rosetta mission and redesigned in the frame of the AIDA/AIM. JuRa maps the backscatter coefficient of the surface or subsurface, which quantifies the returned power per surface or volume unit. It is related to the degree of heterogeneity at the scale of the wavelength and to the dielectric contrast of heterogeneities, giving access to both, the sub-meter texture of the constituent material and larger scale structures. ------------------------------------------------------- parameter value ------------------------------------------------------- Operating frequency, Hz 60 MHz carrier, 20MHz Measurement resolution, m 15.0 Mass, kg 1.3 Dimensions, m 1.5 four deployable booms ------------------------------------------------------- Mounting Alignment ------------------------------------------------------------------------------ Refer to the latest version of the Juventas Spacecraft Frames Kernel (FK) [4] for the JURA reference frame definitions and mounting alignment information. Apparent FOV Layout ------------------------------------------------------------------------------ This section provides a diagram illustrating the JURA apparent FOV layouts in the JURA reference frame. ^ | direction of | flight | ^ +Xjura (along-track) | | --- .__|__. ^ .' | `. | / | \ | . | . | 80 deg | x-------------> +Yjura (across-track) | . +Zjura . | \ / v `. .' --- ` --- ' | 80 deg | +Zjura is into the page |<----------->| | | FOV Definitions ------------------------------------------------------------------------------ This section contains definitions for the JURA FOVs. These definitions are provided in a format required by the SPICE (CSPICE) function GETFOV (getfov_c). The set of assignments in the data section below defines the JURA FOVs with respect to the corresponding frames to be a rectangle with the corners defined by the first and last pixels of the first and last lines of the CCD and the boresight along the +Z axis. This FOV definition uses the FOV_ANGULAR_SIZE values from the ``Optical Parameters'' section above converted to degrees. JURA: \begindata INS-15513110_NAME = 'JUVENTAS_JURA' INS-15513110_FOV_FRAME = 'JUVENTAS_JURA' INS-15513110_FOV_SHAPE = 'CIRCLE' INS-15513110_BORESIGHT = ( 0.0, 0.0, 1.0 ) INS-15513110_FOV_CLASS_SPEC = 'ANGLES' INS-15513110_FOV_REF_VECTOR = ( 1.0, 0.0, 0.0 ) INS-15513110_FOV_REF_ANGLE = ( 40.0 ) INS-15513110_FOV_ANGLE_UNITS = 'DEGREES' \begintext Platform ID ------------------------------------------------------------------------------- This number is the NAIF instrument ID of the platform on which the sensors are mounted. For the Juventas Radar (JURA) platform is spacecraft. Please refer to the latest version of the JUVENTAS NAIF ID Codes Definitions [4] for mapping of ID codes to sensor and structure names. \begindata INS-15513110_PLATFORM_ID = ( -15513 ) \begintext End of IK file.