:Data Set Overview::The data from the Rosetta Navigation Camera (NavCam) was extracted byBernhard Geiger and Michael Kueppers; the data set was constructed andsubmitted by Colin Archibald on behalf of the Planetary ScienceArchives (PSA).The data have been observed and measured during the CRUISE 4-2 phaseof the Rosetta mission. The data arises from the time period 16 February 2009 and 13 September 2009.All images in this data set are raw and uncalibrated data taken usingthe imaging mode. The data set contains images resolved using bothNavCams onboard the Rosetta S/C and the DATA directory is organisedto reflect this with two sub directories: - CAM1 - CAM2Each NavCam has seven different operational modes, however, onlydata acquired under the IMAGING MODE will be present in the datasets released and so only this mode shall be presented in any detail.A point of note: IMAGING MODE can be operated under the otheravailable modes.The MODE DESCRIPTION table below outlines the details of theIMAGING MODE.:Mode Description::IMAGING MODE:++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++| SUB MODE | FRAME RATE | WINDOW SIZE | INTEGRATION TIME |++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++| IDLE | 1 s | N/A | N/A |++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++| COVER POSITIONING | 0.8 s | N/A | N/A |++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++| IMAGE ACQUISITION | 35 s | 20 x 20 px | 10 ms |++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++| IMAGE ACQUISITION | 35 s | 1024 x 1024 px | 30 s |++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++The IDLE sub mode allows for the window size of the CCD to be set upbefore the IMAGE ACQUISITION mode begins operation. The sizes andtimes shown here for the IMAGING MODE are the lowest and upper boundsthere are hundreds more possibilities for WINDOW SIZE, and hence readout time, under this sub mode.Generally the rule is that if a window size is one full row (1024 px)spanned over one pixel then the readout time will be 4.1 ms, thus thefull window (1024 x 1024 px) will have a total readout time of 4.2 s(including transfer time of 1.3 ms for the image to be received tothe Solid State Mass Memory (SSMM)).:Filename Convention::The filenaming convention for all data levels is given by: __. ROS CAM1 YYYYMMDDThhmmss IMG CAM2 LBL (JPG)Examples: ROS_CAM1_20100530T224504.IMG ROS_CAM1_20100530T224504.LBL (ROS_CAM1_20100530T224504.JPG) ROS_CAM2_20100620T231651.IMG ROS_CAM2_20100620T231651.LBL (ROS_CAM2_20100620T231651.JPG)(In the case of the BROWSE directory):Geometry Information - Coordinate System::The geometry item SC_SUN_POSITION_VECTOR provided in the label of thedata product is relative to the ECLIPJ2000 frame. This reference frameis built up by Ecliptic Coordinates related to Equinox of EpochJ2000.Orientation: - X: Pointing from SUN to Vernal Equinox  - Y: perpendicular to X in Ecliptic Plane  - Z: Perpendicular to Ecliptic plane, pointing north.The items: - RIGHT_ASCENSION  - DECLINATION are given in the PLANETOCENTRIC coordinate system.All these geometry parameters are computed at time t : START_TIME.:

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