KPL/IK MIRO Instrument kernel =========================================================================== This instrument kernel (I-kernel) contains Rosetta MIRO instrument parameters. Version and Date --------------------------------------------------------------------------- Version 1.0 -- March 15, 2005 -- Boris Semenov, NAIF/JPL Version number change for the first official release. Version 0.1 -- September 2, 2004 -- Boris Semenov, NAIF/JPL Filled in instrument overview section (copied from [6]). Version 0.0 -- August 3, 2004 -- Boris Semenov, NAIF/JPL VERY PRELIMINARY VERSION. References --------------------------------------------------------------------------- 1. ``Kernel Pool Required Reading'' 2. ``C-kernel Required Reading'' 3. ``MIRO EID, Part B'', ROS-EST-RS-3005/EID B, 2001-02-15 4. Rosetta Frames Definition Kernel (FK), latest version. 5. ``MIRO: Experiment User Manual'', 8225-EUM-01, 2002-12-XX 6. ESA Science and Technology Web Server, Rosetta Instruments Area, http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=35061 7. E-mail from L. Kamp/JPL, July 15, 2004 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 Rosetta instrument ID code, constructed using the spacecraft ID number (-226) followed by the NAIF three digit ID number for MIRO component. MIRO component ID(s) are defined in [4] as follows: Instrument name ID -------------------- ------- ROS_MIRO -226130 ROS_MIRO_MM -226131 ROS_MIRO_SUBMM -226132 ROS_MIRO_URF -226135 The remainder of the keyword is an underscore character followed by the unique name of the data item. For example, the MIRO mm channel boresight direction is specified by INS-226131_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 [6]: MIRO (Microwave Instrument for the Rosetta Orbiter) is composed of a millimetre wave mixer receiver and a submillimetre heterodyne receiver. The submillimetre wave receiver provides both broad band continuum and high resolution spectroscopic data, whereas the millimetre wave receiver provides continuum data only. MIRO will measure the near surface temperature of the comet, allowing estimation of the thermal and electrical properties of the surface. In addition, the spectrometer portion of MIRO will allow measurements of water, carbon monoxide, ammonia, and methanol in the comet coma. Summary of MIRO Characteristics Operating frequency (millimetre wave receiver, GHz): 188 Operating frequency (submillimetre wave receiver, GHz): 562 Mass (complete instrument, kg): 20.4 Dimensions (sensor unit, l x w x h, mm): 476 x 300 x 681 Power consumption (W): 18.3 - 70.7, dependent on operating mode Mounting Alignment -------------------------------------------------------- Refer to the latest version of the Rosetta Frames Definition Kernel (FK) [4] for the MIRO reference frame definitions and mounting alignment information. Apparent FOV Layout -------------------------------------------------------- WARNING --- the description/diagram below have not been verified This section provides a diagram illustrating the MIRO apparent millimeter and sub-millimeter channel FOV layout in the corresponding reference frames. ^ | direction of | flight | 22 arcmin ^ +Xmm (along track) mm FOV | +Xsubmm | | | | V | | --- V _|_ | --- .'.|.`. | | || x-------------> +Ymm (cross track) | --- `.`-'.' +Ysubmm --- ^ `-' ^ | Each FOV is a single | 8 arcmin circular pixel Boresight (+Z axis) sub-mm FOV is into the page Telescope Parameters -------------------------------------------------------- The following MIRO first order telescope parameters are included in the data section below: ----------------------------------------------------------------- parameter mm sub-mm ----------------------------------------------------------------- Field of view, arcmin nominal (from [3]) 22.0 8.0 actual (from [7]) 23.8 7.5 ----------------------------------------------------------------- The keywords below provide actual values from the table above. Angular size values in the keywords are given radians. \begindata INS-226131_FOV_ANGULAR_SIZE = ( 0.00692314 ) INS-226132_FOV_ANGULAR_SIZE = ( 0.00218166 ) \begintext Detector Parameters -------------------------------------------------------- The nominal MIRO mm and parameters from [7] are: ----------------------------------------------------------------- parameter mm sub-mm ----------------------------------------------------------------- Detector Array Size Cross-track 1 1 Along-track 1 1 ----------------------------------------------------------------- The values for PIXEL_SAMPLES, PIXEL_LINES and CCD_CENTER keywords are given in counts. \begindata INS-226131_PIXEL_SAMPLES = ( 1 ) INS-226131_PIXEL_LINES = ( 1 ) INS-226131_CCD_CENTER = ( 0.5, 0.5 ) INS-226132_PIXEL_SAMPLES = ( 1 ) INS-226132_PIXEL_LINES = ( 1 ) INS-226132_CCD_CENTER = ( 0.5, 0.5 ) \begintext FOV Definitions --------------------------------------------------------------------------- This section contains definitions for the MIRO FOVs. This definition is provided in the format required by the SPICE (CSPICE) function GETFOV (getfov_c). The set of assignments in the data section below defines the MIRO mm and sub-mm channel FOVs with respect to the corresponding frames to be a circle of a specified angular size, centered around the boresight aligned with the +Z axis. These FOV definitions use angular extent style specification with the cross and along track angular sizes taken from the ``Optics Parameters'' section above. \begindata INS-226131_FOV_FRAME = 'ROS_MIRO_MM' INS-226131_FOV_SHAPE = 'CIRCLE' INS-226131_BORESIGHT = ( 0.000000 0.000000 1.000000 ) INS-226131_FOV_CLASS_SPEC = 'ANGLES' INS-226131_FOV_REF_VECTOR = ( 1.000000 0.000000 0.000000 ) INS-226131_FOV_REF_ANGLE = ( 0.19833335 ) INS-226131_FOV_ANGLE_UNITS = 'DEGREES' INS-226132_FOV_FRAME = 'ROS_MIRO_SUBMM' INS-226132_FOV_SHAPE = 'CIRCLE' INS-226132_BORESIGHT = ( 0.000000 0.000000 1.000000 ) INS-226132_FOV_CLASS_SPEC = 'ANGLES' INS-226132_FOV_REF_VECTOR = ( 1.000000 0.000000 0.000000 ) INS-226132_FOV_REF_ANGLE = ( 0.06249996 ) INS-226132_FOV_ANGLE_UNITS = 'DEGREES' \begintext Optical Distortion -------------------------------------------------------- [TBD] Platform ID --------------------------------------------------------------------------- This number is the NAIF instrument ID of the platform on which the instrument mounted. For MIRO it is the spacecraft. \begindata INS-226131_PLATFORM_ID = ( -226000 ) INS-226132_PLATFORM_ID = ( -226000 ) \begintext