KPL/IK INTEGRAL Imager Board the Integral Satellite (IBIS) ============================================================================== This instrument kernel (I-kernel) contains the Imager Board the Integral Satellite (IBIS) optics, detector, and field-of-view parameters. Version and Date ------------------------------------------------------------------------------ Version 0.1 -- July 14, 2022 -- Alfredo Escalante Lopez, ESAC/ESA Added complete and fully coded field-of-view definitions. Version 0.0 -- March 16, 2022 -- Alfredo Escalante Lopez, ESAC/ESA Initial release. References ------------------------------------------------------------------------------ 1. ``Kernel Pool Required Reading'' 2. ``C-kernel Required Reading'' 3. INTEGRAL Frames Definition Kernel (FK), latest version. 4. ``IBIS: The Imager on-board INTEGRAL'', P. Ubertini, 2003. 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 INTEGRAL instrument ID code, constructed using the spacecraft ID number (-275) followed by the NAIF three digit ID number. This number identifies the generic IBIS, one of the filters, or the radiator. The ID numbers are defined in [3] as follows: Instrument name ID -------------------- ------- INTEGRAL_IBIS -275110 The remainder of the keyword is an underscore character followed by the unique name of the data item. For example, the f/ratio of the IBIS is specified by INS-275110_F/RATIO 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 [4]: The IBIS imaging system is based on two independent solid state detector arrays optimised for low (15−1000 keV) and high (0.175-10.0 MeV) energies surrounded by an active VETO System. This high efficiency shield is essential to minimise the background induced by high energy particles in the highly excentric out of van Allen belt orbit. A Tungsten Coded Aperture Mask, 16mm thick and 1 squared meter in dimension is the imaging device. The total field of view (down to zero response) is 29.1 x 29.4 degrees, and the fully coded field of view is 8.3 x 8 degrees. The tungsten coded-aperture mask, optimised for high angular resolution, is located at 3.2 meters above the detection plane. The IBIS telescope provides a unique combination of unprecedented high energy wide field imaging capability coupled with broad band spectroscopy and high resolution timing over the energy range from X to gamma rays. Mounting Alignment ------------------------------------------------------------------------------ Refer to the latest version of the INTEGRAL Frames Definition Kernel (FK) [3] for the IBIS reference frame definitions and mounting alignment information. Apparent FOV Layout ------------------------------------------------------------------------------ This section provides a diagram illustrating the IBIS apparent FOV layout in the corresponding reference frame. Pixel (0,0) is in the lower left corner of the image, and pixel (1023,1023) is in the top right corner. +X, +Y, +Z axes are defined in the INTEGRAL Frames Definition Kernel (FK) [3]. | 29.4 deg | | (8.3 deg fully coded) | Boresight (+Z axis) |<----------------------->| is into the page | | 128 pixels/line --- +-------------------------+ ^ 128 | | | lines | | | | | |29.1 deg | +Zibis | |(8 deg fully coded)| x-------------> +Xibis | | | | | | | | | | | | v | | | --- (0,0)----------|------------+ Pixel | | v +Yibis Optical Parameters ------------------------------------------------------------------------------ [TBW]] CCD Parameters ------------------------------------------------------------------------------ [TBW]] Filter Parameters ------------------------------------------------------------------------------ [TBW] FOV Definitions ------------------------------------------------------------------------------ This section contains definitions for the IBIS FOV. 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 IBIS FOV with respect to the corresponding frame 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. \begindata INS-275110_FOV_FRAME = 'INTEGRAL_IBIS' INS-275110_FOV_SHAPE = 'RECTANGLE' INS-275110_BORESIGHT = ( 0.0, 0.0, 1.0 ) INS-275110_FOV_CLASS_SPEC = 'ANGLES' INS-275110_FOV_REF_VECTOR = ( 1.0, 0.0, 0.0 ) INS-275110_FOV_REF_ANGLE = ( 14.70 ) INS-275110_FOV_CROSS_ANGLE = ( 14.55 ) INS-275110_FOV_ANGLE_UNITS = 'DEGREES' INS-275111_FOV_FRAME = 'INTEGRAL_IBIS' INS-275111_FOV_SHAPE = 'RECTANGLE' INS-275111_BORESIGHT = ( 0.0, 0.0, 1.0 ) INS-275111_FOV_CLASS_SPEC = 'ANGLES' INS-275111_FOV_REF_VECTOR = ( 1.0, 0.0, 0.0 ) INS-275111_FOV_REF_ANGLE = ( 4.15 ) INS-275111_FOV_CROSS_ANGLE = ( 4.00 ) INS-275111_FOV_ANGLE_UNITS = 'DEGREES' \begintext Optical Distortion ------------------------------------------------------------------------------ [TBW] Platform ID --------------------------------------------------------------------------- This number is the NAIF instrument ID of the platform on which the instrument mounted. For all IBIS components it is the spacecraft. \begindata INS-275110_PLATFORM_ID = ( -275000 ) INS-275111_PLATFORM_ID = ( -275000 ) \begintext End of IK file.