You need to do two things: (a) change the name of the file, and (b) change the information in the header describing the "image type".
The linearity should be good to <1% up to 20,000 and 40,000 adu, depending on which CCD. The point at which each amplifier saturates is posted on the main CTIO Mosaic web page. The amplifiers probably begin to go non-linear within 10% of these values. Note that there are SIGNIFICANT variations, so one must be careful when specifying the saturation value.
Before fixing any headers, save a copy of the original image.
epar fixhdr1 | ||
image = | obs1011.fits | Image to update header |
ra = | 05:13:02.71 | right ascension |
dec = | +09:51:05.00 | declination |
filter = | V c6026 | filter |
(epoch = | 2000.) | epoch of coordinates |
(hdrpath = | home$uparm/) | Path to header files |
(update = | yes) | update image headers |
verbosi = | yes) | verbose mode |
(mode = | q) |
The tasks to use are mscsplit and mscjoin.
Lindsey Davis described some of the details of the WCS calculations in this email about Mosaic WCS computations.
Frank Valdes described this correction in an email about using the task 'pixarea' in the mscred package.
Last updated: April 2010 by AMK