KPL/IK MERTIS Instrument Kernel =========================================================================== This instrument kernel (I-kernel) contains references to mounting alignment, operating modes, and timing as well as internal and FOV geometry for the BepiColombo MPO MErcury Radiometer and Thermal Infrared Spectrometer (MERTIS). Version and Date --------------------------------------------------------------- Version 0.1 -- July 08, 2013 -- Marc Costa Sitja, ESAC/ESA Updated BEPICOLOMBO MPO IDs from -69 to -121. Removed kernel name and version assignment. Version 0.0 -- February 11, 2013 -- Jonathan McAuliffe, ESAC/ESA Initial prototype release. References --------------------------------------------------------------- 1. ``Kernel Pool Required Reading'' 2. BepiColombo MPO Spacecraft Frames Definition Kernel 3. ``Frames Required Reading'' 4. ``C-Kernel Required Reading'' 5. ``The Mercury Radiometer and Thermal Infrared Spectrometer (MERTIS) for the BepiColombo mission'', Planetary and Space Science 58 (2010) 144-165. 6. MERTIS User Manual 7. MERITS Experiment Interface Document B (EID-B) 8. Bepi Frames Kernel Contact Information ----------------------------------------------------------------------------- If you have any questions regarding this file contact SPICE support at ESAC: Marc Costa Sitja (+34) 91-8131-457 mcosta@sciops.esa.int, esa_spice@sciops.esa.int or NAIF at JPL: Boris Semenov (818) 354-8136 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 normally during program initialization. Loading the kernel associates the data items with their names in a data structure called the "kernel pool". The SPICELIB routine FURNSH loads a kernel into the pool as shown below: FORTRAN: (SPICELIB) CALL FURNSH ( frame_kernel_name ) C: (CSPICE) furnsh_c ( frame_kernel_name ); IDL: (ICY) cspice_furnsh, frame_kernel_name MATLAB: (MICE) cspice_furnsh ( 'frame_kernel_name' ) PYTHON: (SPICEYPY)* furnsh( frame_kernel_name ) In order for a program or routine to extract data from the pool, the SPICELIB routines GDPOOL, GIPOOL, and GCPOOL are used. See [2] for more details. This file was created and may be updated with a text editor or word processor. * SPICEPY is a non-official, community developed Python wrapper for the NAIF SPICE toolkit. Its development is managed on Github. It is available at: https://github.com/AndrewAnnex/SpiceyPy Naming Conventions --------------------------------------------------------------- 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 MPO instrument ID code, constructed using the spacecraft ID number (-69) followed by the NAIF three digit ID number for one of the MERTIS data item. These IDs are as follows Instrument name ID -------------------- ------- MPO_MERTIS_PLANET -121200 MPO_MERTIS_PLANET_TIS -121201 MPO_MERTIS_PLANET_TIR -121202 MPO_MERTIS_SPACE -121210 MPO_MERTIS_SPACE_TIS -121211 MPO_MERTIS_SPACE_TIR -121212 The remainder of the name is an underscore character followed by the unique name of the data item. For example, the TIS boresight direction in the MPO_MERTIS_PLANET frame (see [2]) is specified by: INS-121201_BORESIGHT The upper bound on the length of the name of any data item identifier is 32 characters. If the same item is included in more than one file, or if the same item appears more than once within a single file, the latest value supersedes any earlier values. Overview --------------------------------------------------------------- From [5]: ``The Mercury Radiometer and Thermal Infrared Spectrometer (MERTIS) is an innovative instrument for studying the surface composition and mineralogy of planet Mercury. MERTIS combines an uncooled grating push broom IR-spectrometer (TIS) with a radiometer (TIR), which will operate in the wavelength region of 7-14 and 7-40 um, respectively. The spatial resolution of the MERTIS observations will be about 500 m globally and better than 500 m for approximately 5-10 percent of the surface.'' From [5]: ``MERTIS is part of BepiColombo's MPO, scheduled for launch in 2014 to reach Mercury in 2019. MERTIS combines a push broom grating IR-spectrometer (TIS) with a radiometer (TIR) and has heritage from the Mars Express Planetary Fourier Spectrometer (PFS), the Visual and Thermal Imaging Spectro- meter (VIRTIS) for the Rosetta and Venus Express missions, and the Bispectral Infrared Detection (BIRD) (Scholl and Paez-Padilla, 1997; Helbert et al., 2005; Reininger et al., 1996; BrieX et al., 2000; Arnold et al., 2008). Due to the integrated instrument approach of the proposed design, MERTIS-TIS and MERTIS-TIR share the same optics, instrument electronics and in-flight calibration components, similar to the Planetary Fourier Spectrometer on Mars Express (Formisano et al., 2002) or to the Thermal Emission Spectrometer on the Mars Global Surveyor (Christensen et al., 2001).'' Summary of VIRTIS Characteristics Spectral range (mkm): Spectral resolution: Field of view (mrad x mrad) Mass (kg): Mounting Alignment -------------------------------------------------------- Refer to the latest version of the BepiColombo Frames Definition Kernel (FK) [8] for the MERTIS reference frame definitions and mounting alignment information. Fields of View Summary --------------------------------------------------------------- The following is a summary of the MERTIS fields of view provided in [EDF - ** get better reference **]: ----------------- ---------------- ---------------- Slit Horizontal Vertical ----------------- ---------------- ---------------- TIS 4.0 degrees 0.04 degrees TIR 4.0 degrees 1.0 degrees ----------------- ---------------- ---------------- where the horizontal direction lies along the spacecraft Y-axis and the vertical is along the spacecraft X-axis. TIS Field of View Specification --------------------------------------------------------------- The rotating pointing mechansim in MERTIS allows the TIS field of view to be pointed at either the surface (PLANET), cold space (SPACE) or one of 2 onboard calibration sources. The TIS slit creates a rectangular field of view with angular dimensions of 4.0 x 0.040107 (degrees). The larger of the two angles extends along the spacecraft Y axis. ^ +Xsc (cross track) | ^ direction | | | of | 0.040107 degrees | | flight | | v Pixel 1 | Pixel 256 --- +---------|---------+ | 1 line | x-------------> +Ysc (across track) --- +-------------------+ ^ 256 pixels/line | | 4.0 degrees | |<----------------->| | | Boresight (+Z axis) is into the page The following diagrams illustrate the above field of view in the instrument frame: Y ins ^ / | / | / | / X | / o ins |/ 2.0 x--------> |\ Z | \ ins | \ | \ | \ | \ Plane X = 0 X ins ^ / | / | / | / Y | / o ins |/ 0.02 o--------> |\ Z | \ ins | \ | \ | \ | \ Plane Y = 0 which leads to the following FOV definitions: \begindata INS-121200_FOV_FRAME = 'MPO_MERTIS_PLANET' INS-121200_FOV_SHAPE = 'RECTANGLE' INS-121200_BORESIGHT = ( 0.0, 0.0, 1.0 ) INS-121200_FOV_CLASS_SPEC = 'ANGLES' INS-121200_FOV_REF_VECTOR = ( 1.0, 0.0, 0.0 ) INS-121200_FOV_REF_ANGLE = ( 0.02 ) INS-121200_FOV_CROSS_ANGLE = ( 2.0 ) INS-121200_FOV_ANGLE_UNITS = 'DEGREES' \begintext \begindata INS-121210_FOV_FRAME = 'MPO_MERTIS_SPACE' INS-121210_FOV_SHAPE = 'RECTANGLE' INS-121210_BORESIGHT = ( 0.0, 0.0, 1.0 ) INS-121210_FOV_CLASS_SPEC = 'ANGLES' INS-121210_FOV_REF_VECTOR = ( 1.0, 0.0, 0.0 ) INS-121210_FOV_REF_ANGLE = ( 0.02 ) INS-121210_FOV_CROSS_ANGLE = ( 2.0 ) INS-121210_FOV_ANGLE_UNITS = 'DEGREES' \begintext TIR Field of View Specification --------------------------------------------------------------- The rotating pointing mechansim in MERTIS allows the TIR field of view to be pointed at either the surface (PLANET), cold space (SPACE) or one of 2 onboard calibration sources. The TIR surface slit creates a rectangular field of view with angular dimensions of 4.0 x 1.0 (degrees). The larger of the two angles extends along the spacecraft Y axis. ^ +Xsc (cross track) | ^ direction | | | of | 1.0 degree | | flight | | v Pixel 1 | Pixel 256 --- +---------|---------+ | 1 line | x-------------> +Ysc (across track) --- +-------------------+ ^ 256 pixels/line | | 4.0 degrees | |<----------------->| | | Boresight (+Z axis) is into the page The following diagrams illustrate the above field of view in the instrument frame: Y ins ^ / | / | / | / X | / o ins |/ 2.0 x--------> |\ Z | \ ins | \ | \ | \ | \ Plane X = 0 X ins ^ / | / | / | / Y | / o ins |/ 0.5 o--------> |\ Z | \ ins | \ | \ | \ | \ Plane Y = 0 which leads to the following FOV definitions: \begindata INS-121202_FOV_FRAME = 'MPO_MERTIS_PLANET' INS-121202_FOV_SHAPE = 'RECTANGLE' INS-121202_BORESIGHT = ( 0.0, 0.0, 1.0 ) INS-121202_FOV_CLASS_SPEC = 'ANGLES' INS-121202_FOV_REF_VECTOR = ( 1.0, 0.0, 0.0 ) INS-121202_FOV_REF_ANGLE = ( 2.0 ) INS-121202_FOV_CROSS_ANGLE = ( 0.5 ) INS-121202_FOV_ANGLE_UNITS = 'DEGREES' \begintext \begindata INS-121212_FOV_FRAME = 'MPO_MERTIS_SPACE' INS-121212_FOV_SHAPE = 'RECTANGLE' INS-121212_BORESIGHT = ( 0.0, 0.0, 1.0 ) INS-121212_FOV_CLASS_SPEC = 'ANGLES' INS-121212_FOV_REF_VECTOR = ( 1.0, 0.0, 0.0 ) INS-121212_FOV_REF_ANGLE = ( 2.0 ) INS-121212_FOV_CROSS_ANGLE = ( 0.5 ) INS-121212_FOV_ANGLE_UNITS = 'DEGREES' \begintext Optical Paramters --------------------------------------------------------------- Detector Parameters --------------------------------------------------------------- Platform ID --------------------------------------------------------------- This number is the NAIF instrument ID of the platform on which the channels are mounted. For all channels this platform is the spacecraft. \begindata INS-121200_PLATFORM_ID = ( -121000 ) INS-121210_PLATFORM_ID = ( -121000 ) \begintext End of IK file.