Embedded Files
January 2018.
Many astronomy programs allow you to track the comet by clicking on it in each frame, but may not have the facility to ingest the comet's predicted motion. But the comet you are trying to catch is faint and moving, and does not show up on an individual or stacked image.You need to do this:
C/2017 T1 (Heinze) 212 exposures between 2:20 and 4:20 UT 20180116.
Workflow:
1. ImagesPlus produces a series of all images aligned and rotated.
2. Export them as BMP to minimize information loss
3. Bulk rename the images in their own directory so they are chronologically ordered, ending with _nnnn.BMP
4. Use JPL Horizons ephemeris to get positions at start and end, use planetarium software and your stacked image to translate RA&Dec into
X,Y on the stacked image, then subtract to get shift in X and Y, e.g.:
IMG_0003 02:21:00.000 22 39 03.36 +45 23 36.0 X: 2685 Y: 865
IMG_0221 04:23:00.000 22 38 29.77 +45 13 37.4 X: 2569 Y: 934
Del X: -116 Del Y: 69
Number of shifts: final-initial = 218
5. From the BMP directory, call the perl script that calls imagemagick to offset: \guide_on_comet_v1.pl -s -116 -e 39
6. Go to the subdirectory "guided" to see the translated BMPs, stack with ImagesPlus
7. Stretch the image carefully, and hope that your object does not lie under a star trail.
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