KPL/IK OSIRIS Instrument kernel =========================================================================== This instrument kernel (I-kernel) contains Rosetta Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) Narrow Angle Camera (NAC) and Wide Angle Camera (WAC) optics, detector, and field-of-view parameters. Version and Date --------------------------------------------------------------------------- Version 1.0 -- March 15, 2005 -- Boris Semenov, NAIF/JPL Version number change for the first official release. Version 0.2 -- March 15, 2005 -- Boris Semenov, NAIF/JPL Corrected typo in WAC FOV boresight definition. 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 Initial release. References --------------------------------------------------------------------------- 1. ``Kernel Pool Required Reading'' 2. ``C-kernel Required Reading'' 3. ``OSIRIS EID, Part B'', ROS-EST-RS-3016/EID B, 2001-05-15 4. Rosetta Frames Definition Kernel (FK), latest version. 5. ``OSIRIS User Manual'', RO-RIS-MPAE-SP-025, 2002-04-30 6. ESA Science and Technology Web Server, Rosetta Instruments Area, http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=35061 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 OSIRIS NAC (111) or WAC (112). These IDs are defined in [4] as follows: Instrument name ID -------------------- ------- ROS_OSIRIS_NAC -226111 ROS_OSIRIS_WAC -226112 The remainder of the keyword is an underscore character followed by the unique name of the data item. For example, the focal length of the OSIRIS NAC is specified by INS-226111_FOCAL_LENGTH 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]: OSIRIS (Optical, Spectroscopic, and Infrared Remote Imaging System) is a dual camera imaging system operating in the visible, near infrared and near ultraviolet wavelength ranges. OSIRIS consists of two independent camera systems sharing common electronics. The narrow angle camera is designed to produce high spatial resolution images of the nucleus of the target comet. The wide angle camera has a wide field of view and high straylight rejection to image the dust and gas directly above the surface of the nucleus of the target comet. Each camera is equipped with filter wheels to allow selection of imaging wavelengths for various purposes. The spectroscopic and wider band infrared imaging capabilities originally proposed and incorporated in the instrument name were descoped during development. Summary of OSIRIS Characteristics Wavelength range (nm): Wide angle camera -- 250 - 1000 Narrow angle camera -- 250 - 1000 Image scale (microradians per pixel): Wide angle camera -- 100 Narrow angle camera -- 20 Field of view (degrees): Wide angle camera -- 12 x 12 Narrow angle camera -- 2.35 x 2.35 Optical design: Wide angle camera -- Two mirror off axis Narrow angle camera -- Three mirror off axis F-ratio: Wide angle camera -- 5.6 Narrow angle camera -- 8.0 Focal length (mm): Wide angle camera -- 140 Narrow angle camera -- 700 Mass (including harness, kg): 34.4 Power consumption (maximum, W): 57.2 Mounting Alignment -------------------------------------------------------- Refer to the latest version of the Rosetta Frames Definition Kernel (FK) [4] for the OSIRIS reference frame definitions and mounting alignment information. Apparent FOV Layout -------------------------------------------------------- WARNING -- the description/diagram is this section have not been verified This section provides a diagram illustrating the OSIRIS NAC and WAC apparent FOV layout in the corresponding reference frames. ^ | direction of | flight | ^ +Xnac (down-track) | +Xwac Pixel | --- (1,1)-------|---------+ ^ | | | | 2.35 deg | | | | (NAC) | | | | | | | | 2048 | x-------------> +Ynac (cross-track) | lines | +Znac | +Ywac | | +Zwac | | 12 deg | | V (WAC) | | --- +-------------------+ 2048 pixels/line | 2.35 deg (NAC) | Boresight (+Z axis) |<----------------->| is into the page | 12 deg (WAC) | Optical Parameters -------------------------------------------------------- The following OSIRIS NAC and WAC nominal first order optical parameters are included in the data section below, from [3]: ----------------------------------------------------------------- parameter NAC WAC ----------------------------------------------------------------- Focal Length, mm 700.0 140 f/ratio f/8 f/5.6 IFOV, rad/pixel 0.000020 0.000100 Field of view (deg) Cross-track 2.35 12.0 Along-track 2.35 12.0 ----------------------------------------------------------------- The keywords below provide nominal data both cameras. Angular size values in the keywords are given radians, with the cross-track size being the first value and the along-track size being the second value in each pair. \begindata INS-226111_FOCAL_LENGTH = ( 700.0 ) INS-226111_F/RATIO = ( 8.0 ) INS-226111_FOV_ANGULAR_SIZE = ( 0.041015, 0.041015 ) INS-226111_IFOV = ( 0.000020 ) INS-226112_FOCAL_LENGTH = ( 140.0 ) INS-226112_F/RATIO = ( 5.6 ) INS-226112_FOV_ANGULAR_SIZE = ( 0.209440, 0.209440 ) INS-226112_IFOV = ( 0.000100 ) \begintext CCD Parameters -------------------------------------------------------- The NAC and WAC use the CCD detector of the same type with the following nominal geometry parameters, from [6]: ----------------------------------------------------------------- parameter value note ----------------------------------------------------------------- Pixel Size, microns Cross-track 13.5 Along-track 13.5 Detector Array Size Cross-track 2048 Along-track 2048 Detector Array Center Cross-track 1023.5 Along-track 1023.5 ----------------------------------------------------------------- The values are given in microns for PIXEL_SIZE keywords and in counts for PIXEL_SAMPLES, PIXEL_LINES, and CENTER keywords. \begindata INS-226111_PIXEL_SIZE = ( 13.5, 13.5 ) INS-226111_PIXEL_SAMPLES = ( 2048 ) INS-226111_PIXEL_LINES = ( 2048 ) INS-226111_CCD_CENTER = ( 1023.5, 1023.5 ) INS-226112_PIXEL_SIZE = ( 13.5, 13.5 ) INS-226112_PIXEL_SAMPLES = ( 2048 ) INS-226112_PIXEL_LINES = ( 2048 ) INS-226112_CCD_CENTER = ( 1023.5, 1023.5 ) \begintext Filter Parameters --------------------------------------------------------------------------- This section contains NAC and WAC filter parameters. NAC [TBD] WAC [TBD] FOV Definitions --------------------------------------------------------------------------- This section contains definitions for the OSIRIS NAC and WAC FOVs. These definitions are provided in the format required by the SPICE (CSPICE) function GETFOV (getfov_c). NAC FOV The set of assignments in the data section below defines the NAC FOV with respect to the ROS_OSIRIS_NAC 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 of the ROS_OSIRIS_NAC frame. This FOV definition uses angular extent style specification with the cross and along track angular sizes taken from the ``Optics Parameters'' section above. \begindata INS-226111_FOV_FRAME = 'ROS_OSIRIS_NAC' INS-226111_FOV_SHAPE = 'RECTANGLE' INS-226111_BORESIGHT = ( 0.000000 0.000000 700.000000 ) INS-226111_FOV_CLASS_SPEC = 'ANGLES' INS-226111_FOV_REF_VECTOR = ( 1.000000 0.000000 0.000000 ) INS-226111_FOV_REF_ANGLE = ( 1.175 ) INS-226111_FOV_CROSS_ANGLE = ( 1.175 ) INS-226111_FOV_ANGLE_UNITS = 'DEGREES' \begintext WAC FOV The set of assignments in the data section below defines the WAC FOV with respect to the ROS_OSIRIS_WAC 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 of the ROS_OSIRIS_WAC frame. This FOV definition uses angular extent style specification with the cross and along track angular sizes taken from the ``Optics Parameters'' section above. \begindata INS-226112_FOV_FRAME = 'ROS_OSIRIS_WAC' INS-226112_FOV_SHAPE = 'RECTANGLE' INS-226112_BORESIGHT = ( 0.000000 0.000000 140.000000 ) INS-226112_FOV_CLASS_SPEC = 'ANGLES' INS-226112_FOV_REF_VECTOR = ( 1.000000 0.000000 0.000000 ) INS-226112_FOV_REF_ANGLE = ( 6.000 ) INS-226112_FOV_CROSS_ANGLE = ( 6.000 ) INS-226112_FOV_ANGLE_UNITS = 'DEGREES' \begintext Optical Distortion -------------------------------------------------------- This section provides optical distortion and geometric calibration data for OSIRIS NAC and WACs. NAC [TBD]. WAC [TBD]. Platform ID --------------------------------------------------------------------------- This number is the NAIF instrument ID of the platform on which the cameras are mounted. For both cameras this platform is the spacecraft. \begindata INS-226111_PLATFORM_ID = ( -226000 ) INS-226112_PLATFORM_ID = ( -226000 ) \begintext