\header ENTRY_TIME = 2004 JUN 14 21:26:03 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 JAN 28 12:33:36 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text The primary purpose of images 477 through 507 was geometric calibration of images taken through the periscope. Images 508 and 509 were tests of windowing, using a 151 x 151 window. Photometric calibration of these was a secondary goal. The target for all images were of the Pleiades (M45, an open cluster). For the primary purpose, the scan mirror was set at one degree intervals from 0 through 20 degrees. All images showed a significant amount of scattered light, but they still were useful for geometric calibration of images taken through the periscope. For this purpose the scan mirror was set at one degree intervals from 0 through 20 degrees. The images showed significant doubling when taken with part of the light coming through the periscope and part of it around the periscope, the two images separated by about 17 pixels. None of the images were of significant use for photometric calibration. \header ENTRY_TIME = 2004 JUN 14 23:24:08 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 MAY 21 21:09:43 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text After almost four months since the last image, this series of four images (510-513)was intended as a check of the camera and the state of its optical system. Image 510, taken through the periscope, seemed to indicate severe contamination, both of the periscope and the rest of the optical system. Image 511, of the calibration lamp showed the lamp filament plainly but also showed a very mottled background. This showed that there was contamination of both the periscope and the camera optics. The final images, off the periscope, seemed to indicate that the camera was in better shape than the periscope. Clearly, another heating cycle was needed to clean up the camera. \header ENTRY_TIME = 2004 JUN 14 23:53:03 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 OCT 08 22:11:21 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Much of the contamination seen in the images 4 1/2 months earlier was on the periscope, which could not be heated without turning the Sun on the battery immediately above it. This is not permitted by spacecraft flight rules. We could, however, turn the Sun on the camera radiator once again, if necessary. Images 514 through 517 were an additional check on the state of the camera, and the camera was found to be heavily contaminated. The first image, of the calibration lamp, showed it to be in much worse shape than it had been the previous May. The other three images, of a star field and off the periscope, were virtually blank, even with a five second exposure for two of them. \header ENTRY_TIME = 2004 JUN 15 00:56:36 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 OCT 11 23:06:37 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text On October 11 the previous cycle of images was repeated as numbers 514 through 517. A few stars in the two 5 second exposures indicated that the contamination was now "only" about 2 1/2 magnitudes (a factor of 10)! Just turning on the CCD heater prior to this data set had helped, but not nearly as much as needed,so commands were sent to put the Sun on the CCD radiator once again. \header ENTRY_TIME = 2004 JUN 15 18:29:10 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 OCT 30 15:07:34 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Following a full heating with the Sun on the radiator and the CCD and scan mechanism heaters turned on, this set of four image (522 through 525)was meant to determine how successful we had been in clearing off the contamination adhering to camera components. We found that contamination had been reduced from 2.5 magnitudes to about 0.5 magnitudes (a factor of ten to a factor of 1.58 reduction in transmission). These much improved images utilized exposures of one second, five seconds, five seconds, and finally 20 milliseconds with the calibration lamp turned on. For some reason, the calibration lamp didn't seem to have been turned on. (This happened again just before the Wild 2 encounter. It may have been caused by solar particle radiation flipping a bit somewhere in the lamp or shutter logic circuits.) \header ENTRY_TIME = 2004 JUN 15 20:10:00 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 NOV 08 16:15:03 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 526 and 527 were intended as shutter checks, because the calibration lamp hadn't appeared in image 525. Image 526 was a five second timed exposure on a star field. It appeared perfectly normal. Image 527 tested the bulb mode, where the shutter is commanded open and stays open until it receives the close command. This method also worked perfectly. The lack of an image of the calibration lamp in image 525 remains an enigma. \header ENTRY_TIME = 2004 JUN 15 22:43:25 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 NOV 13 06:56:05 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 528, 529, and 530 were 3 second full frames exposed on the encounter field. We were concerned about the number of background stars available for optical navigation, this not being the richest field in the sky. We also wanted to check, once again, how much scattered light might confront us. As we expected, there were no severe problems with scan mirror settings of less then 170 degrees. Since these images were of the encounter field, chief optical navigator Shyam Bhaskaran scanned a frame looking for Wild 2. There seemed to be something at about the correct position. He co-added the three frames and was convinced he had found Wild 2. Others present at his request were even more sure that he had found the comet. These were the first images taken to search for Wild 2, and the project heaved a huge sigh of collective relief at the comet having been located in nearly the predicted place more than six weeks before the encounter. \header ENTRY_TIME = 2004 JUN 23 00:00:13 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 NOV 13 17:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 528, 529, and 530 were 3 second full frames exposed on the encounter field. We were concerned about the number of background stars available for optical navigation, his not being the richest field in the dky. We also wanted to check, once again, how much scattered light might confront us. As we expected, there were no severe problems with scan mirror settings of less than 170 degrees. Since these images were of the encounter field, chief optical navigator Shyam Bhaskaran scanned a frame loopking for Wild 2. There seemed to be something at about the correct position. He co-added the three frames and was convinced he had found Wild 2. Others present at his request were even more sure that he had found the comet. These were the first images taken to search for Wild 2, and the project heaved a huge sigh of collective relief at the comet having been located in nearly the predicted place more than six weeks before the encounter. \header ENTRY_TIME = 2004 JUN 15 22:58:22 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 NOV 17 16:59:59 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 531 through 555 were a test of windowing and pattern matching. All images in this group used four 51 x 51 pixel windows, three on stars and one on the expected position of Wild 2. Image 532, if it ever existed, was not transmitted to the ground. The proper windows were created in every case, but the pattern matching varied from no match, to matched with stars near the edge of the window to stars nearly centered. All were taken with exposures of 5 seconds (531 through 550) or 15 seconds (551 through 555). Individually, none provided an obvious image of Wild 2. \header ENTRY_TIME = 2004 JUN 15 22:21:08 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 NOV 20 17:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text This was a set of three full frame images. The first of them, 556, was missing some packets and was a bit of a mess. The other two were fine 5 second and 15 images and served to confirm quite definitely the presence and location of Wild 2. Needless to say, having definitely acquired the location of Wild 2 this early was a huge relief to the STARDUST team. \header ENTRY_TIME = 2004 JUN 15 23:26:50 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 NOV 24 04:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 559 through 583 were windowed images, in this case three 51 x 51 images and one 71 x 71 image, the latter the window on the predicted comet position. Twenty of these were 5 second exposures and five were 15 second exposures. Eight images were not pattern matched, while the other 17 seemed to work perfectly. The image of Wild 2 can be seen in each invidual 71 x 71 image, that is properly locked, by using a bit of stretch. \header ENTRY_TIME = 2004 JUN 15 23:55:58 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 NOV 27 17:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 584 through 608 were a repeat of the previous set, except they were divided 10 at five second exposures and 15 at fifteen second exposures. The same window sizes were used, 51 x 51 for the stars and 71 x 71 for the comet. This time only five did not lock up (pattern match). These images were intended for optical navigation, as was the previous set. \header ENTRY_TIME = 2004 JUN 16 00:14:22 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 01 05:00:24 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text These images,609 through 633, were intended to be another set of 25 optical navigation images using three 51 x 51 pixel images and one 71 x 71 pixel image. Only four of them achived pattern matching, however, and those were very poorly centered. These were of little use. \header ENTRY_TIME = 2004 JUN 16 00:40:02 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 04 10:44:18 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 634 through 673 were periscope checks, intended to see how well the spacecraft could be guided when it had to be pointed in the ram direction. The first nine frames were full frame 5 second exposures at a scan mirror angle of 1.94 degrees. All exhibited considerable scattered light. The next four images were again full frame, but this time at a scan mirror angle of 1.57 degrees. The exposures were 15, 7.5, 5, and 3 seconds. Again there was a great deal of scattered light. The remainder of the frames were taken at a mirror angle of 16.82 degrees. The first two of these were again full frames using a 15 second exposure. The remainder were all windowed, using three 51 x 51 pixel sizes and one using 71 x 71 pixels. They utilized exposures of 5 seconds or 15 seconds. All of these contained a great deal of scattered light, and none were successful in pattern matching. \header ENTRY_TIME = 2004 JUN 16 00:57:15 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 08 13:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text The next set of 25 images, 634 through 698, were taken off periscope at a scan mirror angle of 34.24 degrees. All were windowed with three windows 51 x 51 pixels and one window 71 x 71 pixels. The first five images had five second exposures, the next five had 10 second exposures, and the final 15 used 15 second exposures. The first five images did not achieve lock, nor did the last of the 10 second exposures. The first four 10 second exposures and all of the 15 second exposures achieved a good lock. \header ENTRY_TIME = 2004 JUN 16 17:22:24 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 09 05:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text This set of 25 images (699 through 724)was taken strictly for optical navigation purposes. The first five received an exposure of 5 seconds, the second five 10 seconds, and the third, a group of 15, received an exposure of 15 seconds. Pattern matching was not achieved on the first five (699-703),nor on 705, 706, 708, 710, 714, 716, 718, 722, or 723. Image 724 which is a full frame, shows considerable scattered light as well as a strange artifact of several adjacent columns. This artifact also appears in the other images of this group, but fortunately it does not cross any of the windows. Looking back, the artifact apparently first appeared in image 701. All of this still left 11 good images for optical navigation purposes. P/Wild 2 still is an easy target in the 71 x 71 window of each image. \header ENTRY_TIME = 2004 JUN 16 17:38:54 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 10 05:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text This set of 25 images (725 through 749) again was taken strictly for optical navigationp purposes. The first five received an exposure of 5 seconds, the second five 10 seconds, and the third, a group of 15, received an exposure of 15 seconds. Pattern matching was achived on only four windows, 730, 732, 734, and 738. The artifact, first seen in image 701, is apparent in this set of images as well. \header ENTRY_TIME = 2004 JUN 16 17:53:07 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 11 05:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text This set of 25 images (750 through 774) again was taken strictly for optical navigationp purposes. The first five received an exposure of 5 seconds, the second five 10 seconds, and the third, a group of 15, received an exposure of 15 seconds. Pattern matching was achived on only five images, 755 through 759. The artifact, first seen in image 701, is apparent in this set of images as well, but seems to be fadeing. \header ENTRY_TIME = 2004 JUN 16 22:00:49 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 12 11:59:59 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text This set of images, 775 to 800, was another set taken just like previous sets except the scan mirror was set at an angle of 31.84 degrees. Again exposures were set at 5 seconds for the first five, 10 seconds for the second five, and 15 seconds for the final fifteen. The first fourteen of the 15 second exposures were windowed, three at 51 x 51 pixels and one at 71 x 71 pixels. The last image was a full frame. The pattern was not matched on ANY of the windowed images. So we were left with only one image, number 800, and that had severe scattered light problems. \header ENTRY_TIME = 2004 JUN 16 22:20:14 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 13 05:59:59 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text This set of images, 801 to 825, was another set taken just like previous sets except the scan mirror was set at an angle of 31.43 degrees and the final image was also windowed. Again exposures were set at 5 seconds for the first five, 10 seconds for the second five, and 15 seconds for the final fifteen. All 25 exposures were windowed, three windows at 51 x 51 pixels and one at 71 x 71 pixels. The pattern was not matched on any of the first 24 images. So we were left with only one properly pattern matched image, number 825, which showed the comet quite clearly. \header ENTRY_TIME = 2004 JUN 16 22:59:34 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 14 12:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text This set of images, 826 to 850, was another set taken just like earlier sets, except the scan mirror was set at an angle of 30.63 degrees and the final image again was windowed. Again exposures were set at 5 seconds for the first five, 10 seconds for the second five, and 15 seconds for the final fifteen. All 25 exposures were windowed, three windows at 51 x 51 pixels and one at 71 x 71 pixels. One image, 835, was missing many packets. Two windows were missing entirely and the third was only partially present. The pattern was matched on only five images, 831, 833, 839, 847, and 850. \header ENTRY_TIME = 2004 JUN 17 17:00:03 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 15 12:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Realizing the poor yield of the pattern matching program with small windows, it was decided to use fewer but much larger windows, 201 x 201, and not to attempt pattern matching. Image 851 utilized three of these much larger windows. Image 852 used two 201 x 201 windows and one 1 x 1 image, which significantly reduced the amount of data to be returned. Image 853 once again used three 201 x 210 windows. All were 15 second exposures at 30.69 degrees scan mirror setting, and all showed the comet. \header ENTRY_TIME = 2004 JUN 17 20:44:09 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 16 04:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text The December 16 set of Op Nav images was composed of three 201 x 201 pixel windows. These were all 15 second exposures at a scan mirror angle of 30.29 degrees. The only significant problem was that the bad columns, that first appeared in image 701, fell right across two of the windows, which were a bit too far to the right in the frame. \header ENTRY_TIME = 2004 JUN 17 20:48:43 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 16 05:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text The December 16 set of Op Nav images was composed of three 201 x 201 pixel windows, 854, 855, and 856. These were all 15 second exposures at a scan mirror angle of 30.29 degrees. The only significant problem was that the bad columns, that first appeared in image 701, fell right across two of the windows, which were set a bit too far to the right in the frame. \header ENTRY_TIME = 2004 JUN 17 21:22:13 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 17 05:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text The December 17 set of Op Nav images was composed once again of two 201 x 201 pixel windows and one 1 x 1 pixel window. These are numbered as windows 857, 858, and 859. All were 15 second exposures at a scan mirror angle of 29.65 degrees. All were properly placed, with the bad columns now falling between windows. \header ENTRY_TIME = 2004 JUN 17 23:17:21 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 18 04:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text The sequence of December 18 was meant to serve two purposes. The first 14 full frame uncompressed images were meant to photometrically calibrate the camera for the encounter, now only two weeks off. Images 860 and 873 are bias frames. Images 861 through 869 were off periscope images taken at a scan mirror setting of 23.98 degrees. Images 870, 871, and 872 included the periscope in the light path with the scan mirror set at 0.20 degrees. The final three frames, 874, 875, and 876 were meant to further understand periscope use when it included light both through the periscope and around it. The sad thing is that none of these images were of signifcant use. All contained many thousands of hot pixels as well as a generally high background level. The camera electronics had been left turned on to prevent possible failure due to excessive on and off cycles, the time when most electronics fail, if they are going to do so. Hereafter the electronics were turned off when not in use, and everything worked just fine. There was now no time for an additional photometric calibration before encounter, so it was decided to go with just the planned post-encounter photometric calibration. \header ENTRY_TIME = 2004 JUN 17 23:25:50 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 19 12:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 877 through 879 were once again for optical navigation. These images all used 15 second exposures with the scan mirror set at 28.40 degrees. Wild 2 was now quite easy to see on each individual frame. \header ENTRY_TIME = 2004 JUN 17 23:27:29 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 20 12:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 880 through 882 were once again for optical navigation. These images all used 15 second exposures with the scan mirror set at 27.88 degrees. Wild 2 was now quite easy to see on each individual frame. \header ENTRY_TIME = 2004 JUN 17 23:30:35 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 21 11:59:59 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 883 through 885 were once again for optical navigation. These images all used 15 second exposures with the scan mirror set at 27.25 degrees. Wild 2 is now quite easy to see on each individual frame. \header ENTRY_TIME = 2004 JUN 17 23:53:12 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 22 03:59:59 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 886, 887, and 888 were again for optical navigation. Image 989 does not exist for unknown reasons. These images all used 15 second exposures with the scan mirror set at 26.96 degrees. All continued to use three 201 x 201 pixel windowing. \header ENTRY_TIME = 2004 JUN 18 00:33:29 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 24 03:00:44 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 890 through 906 were still taken for optical navigation. All images were taken with a 20 second exposure at a scan mirror angle of 24.10 degrees. All consist of three windows, now 301 x 301 pixels in size. \header ENTRY_TIME = 2004 JUN 18 00:50:14 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 25 02:00:44 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 907 through 924 were still taken for optical navigation. All images were taken with a 20 second exposure at a scan mirror angle of 24.10 degrees. All were meant to consist of three windows, again 301 x 301 pixels in size. Image 907 does not exist. Images 908, 909, and 910 are all incomplete, consisting in each case of a single incomplete window. The remainder of the images are very good normal frames. Since new data were being taken every day, no attempt was made to retransmit the incomplete images. \header ENTRY_TIME = 2004 JUN 18 01:14:12 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 26 03:00:45 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 926 through 942 were still taken for optical navigation. All images were taken with a 20 second exposure at a scan mirror angle of 23.57 degrees. All were meant to consist of three windows, again 301 x 301 pixels in size. Image 925 does not exist. Images 927 through 930 are also missing for unknown reasons. The remainder, 931 through 942 are excellent. Again no attempt was made to retransmit the missing images, if in fact they ever existed. So many images were being taken that it was pretty easy to lose track of which had and which had not been taken. It was always much safer to skip a few numbers than to give two images the same number. \header ENTRY_TIME = 2004 JUN 18 20:25:41 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 26 16:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text This set of images made up the second optical navigation sequence of December 26, as optical navigation prepared for the final TCMs, if they proved necessary. They are images 943 through 960, consisting of 20 second exposures at a scan mirror angle of 23.30 degrees. Each consisted of three 301 x 301 windows. All turned out quite well. \header ENTRY_TIME = 2004 JUN 18 20:57:36 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 28 02:01:30 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Following a day "off" when an additional heating cycle was carried out for a decontamination of the camera, optical navigation images were resumed, images which also determined the then current state of the camera. Images 961 and 962 appear not to exist. Image 963 appears to consist of one window with many missing packets. Images 964 and 965 have single partial windows, each with many missing packets. Image 967 consists of two windows, only one of which is complete, but the complete window does contain a useable image of the comet. Images 966 and 968 through 978 have the normal three windows of 301 x 301 pixels. Three of these have 20 second exposures and nine were given 10 second exposures. All were taken with the scan mirror at 22.49 degrees. \header ENTRY_TIME = 2004 JUN 18 21:27:13 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 29 05:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text In the series of images 979 through 996, only 983 and 984 are missing packets. All images were acquired at a scan mirror angle of 21.87 degrees. Images 979 through 982 and 985 through 987 were given 20 second exposures, while 988 through 996 received 10 second exposures. All complete images had three 301 x 301 pixel windows. \header ENTRY_TIME = 2004 JUN 18 21:39:28 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 30 05:27:15 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 997 through 999 were missing the first packet, thereby ruining each entire image. In this hectic period, no attempt was made to reconstruct them. Image 1000 consisted of one normal 301 x 301 pixel window and two 1 x 1 pixel windows. The image of Wild2 was in one of the latter. Images 1001 through 1014 were normal, each having three 301 x 301 windows. The first five good frames received 20 second exposures, and the last nine were all 10 second exposures. These, of course, were again taken for optical navigation purposes. \header ENTRY_TIME = 2004 JUN 18 22:14:58 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 30 22:35:15 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text The second set of December 30 images probably included 1015 through 1021, which are missing. I say this because there are only two images with 20 second exposures instead of the usual nine. The two 20 second images are 1022 and 1023. These are followed by 1024 through 1032, which are 10 seond exposures. All were taken at a scan mirror angle of 21.00 degrees and with three 301 x 301 pixel pixel windows. \header ENTRY_TIME = 2004 JUN 18 22:30:26 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 31 07:00:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text Images 1033 through 1050 constituted the first set of December 31 exposures. All were taken at a scan mirror angle of 20.77 degrees and with three 301 x 301 pixel windows. The first nine were 20 second exposures and the second nine were 10 second exposures. \header ENTRY_TIME = 2004 JUN 18 22:35:26 SYSTEM_NAME = NAVCAM AUTHOR = RAY L. NEWBURN, JR. INSTITUTION = JPL (CHIPTON-ROSS) START_TIME = 2003 DEC 31 20:18:00 STOP_TIME = NULL TARGET = OTHER DAY = NULL \text The second set of December 31 images consisted of eight images numbered 1051 through 1058. The first four were 15 second exposures, the second four 10 seconds. All utilized a scan mirror of 24.49 degrees. Each consisted of three windows of 291 x 291 pixels.