Rev 126 - Feb 4-22, 2010 - Mimas (main target), Tethys, Iapetus, Calypso and mutual events too Options

[belleraphon1]

All

closest look at Mimas ... 30 minutes after periapsis on 02/13/10 at 17:25 UTC

http://ciclops.org/view/6188/Rev126

"Thirty minutes after periapse, ISS will perform a targeted encounter with Saturn's innermost large icy satellite, Mimas. The altitude for this encounter is 9,510 kilometers (5,910 miles) the closest Cassini has ever gotten to this cratered moon. For this encounter, ISS will acquire three mosaics along with another observation where ISS will be riding along with the Composite Infrared Spectrometer (CIRS). ISS' first mosaic of Mimas, GEOLOG001, will start 30 minutes after closest approach when Cassini is 14,800 kilometers (9,200 miles) away from Mimas. GEOLOG001 is a seven-frame, multi-spectral mosaic of the region surrounding the crater Herschel. Herschel, at 130 kilometers (80 miles) across, is the largest impact basin on Mimas, so large that it caused significant amounts of stress on the lithosphere of the small moon and so distinctive that it helped give the satellite the nickname, "The Death Star Moon." These high-resolution observations of the basin will be used to estimate the age of the crater. Scientists will count the number of smaller craters on the basin floor, compared to other regions on Mimas, to set limits on how old the basin can be. The second mosaic, GEOLOG002, will also be a seven-frame, multi-spectral mosaic, this time covering most of the visible surface of Mimas, shown above left. The best resolutions for these two observations will be 87 meters (285 feet) per pixel for GEOLOG001 and 191 meters (626 feet) per pixel GEOLOG002. Next, Cassini will ride-along with a CIRS FP3 temperature map of Mimas' day side, acquiring six narrow-angle-camera images during the scan. Finally, ISS will acquire a full-frame, multispectral observation (GLOCOL001) of Mimas' anti-Saturn hemisphere from a distance of 70,000 kilometers (44,000 miles). Saturn will provide a backdrop for this observation."

Glorious

Craig

[volcanopele]

Well, I know with ISIS2, you can use deltack to adjust the camera angles by comparing the images to a synthetic image, a basemap, or a previously corrected image, for example. Below are so

If you want to tie the image to a synthetic image (good for full-disk image where you are basically doing an interactive limbfit):

CODE

levgeoplane from=W1673418018_1.trim2.cub to=W1673418018_1.ema2.cub lat=no lon=no ema=yes

deltack from=W1673418018_1.trim2.cub iline=517 isamp=390 tline=516 tsamp=391 +
ck1to=/data/cassini/perry/Rev143/Rev143.bc

If you want to tie the image to a basemap or previously reprojected image (if you are making a quick mosaic or you are tying color filter image from a single frame):

CODE

lev2tolev1 from=../../W1673418018_1.orth.cub from2=N1673418904_1.trim2.cub +
tfile=N1673418904_1.ctrl.dat
geom from=../../W1673418018_1.orth.cub to=N1673418904_1.ctrl.cub tfile=N1673418904_1.ctrl.dat

deltack from=N1673418904_1.trim2.cub iline=505 isamp=598 tline=497 tsamp=615 +
ck1to=/data/cassini/perry/Rev143/Rev143.bc

To get the number for deltack, you use qview. You first load the image you want to adjust, then the control image (either the synthetic image or the control image from the basemap/other image). Make sure the two images use the same magnification and Link the two images. Also click the check mark next to Register and type in a file name (in the example below, I used ctrl)

Then you blink the two images using the Blink dialog box. You can move the control image around using the move tool (second button from the left). Clicking using the left mouse button at the top of that image will move it down one pixel (multipled by the scale of the image, in this case, 2 pixels), clicking the bottom of the image will move it up 1, clicking the left side will move it to the right by one pixel, click the right side will move it to the left. Clicking in the corners also works, for example clicking in the upper left corner will move the control image down and to the right. You keep shifting the control image around until the two images, blinking in the other window, are lined up as best as you can make it. Once you have that, you move your mouse cursor over to the original image and you press Ctrl+S. This will bring up the Control Point save dialog box.

The numbers in this box are what you put into deltack. In my example, the first number, 458, goes with tline. The second number, 460, goes with tsamp. The third number, 466, goes with iline. Finally, the fourth number, 451, goes with isamp. Click OK then you can run deltack using the command line.

I do this so often, I can honestly do this in my sleep, but that means that it might be difficult for me to clearly explain this to others. If you have any questions, use "help deltack" in TAE for a more detailed explanation and other usage cases.