05/30/2014:
- Talk with Andy to figure out what output they want
- Convert pixels to RA, Dec for each image and then add it all together. Use to make a template and search for transients.
- Things to fix / look at: secant, stars that have magnitude issues (look constant)
- Make the deltax, deltay plots
05/29/2014:
Attendees: Michael and Chuck
1. Create a public fits files directory
2. [coughlin@lsst-dev ~]$ pwd
/lsst/home/coughlin
# User specific environment and startup programs
PATH=$PATH:$HOME/bin
PATH=$PATH:$HOME/allsky/bin
PATH=$PATH:$HOME/wcstools-3.8.7/bin
PATH=$PATH:$HOME/fisheye
PATH=$PATH:$HOME/sextractor-2.19.5/bin
PATH=$PATH:$HOME/tphot
PATH=$PATH:$HOME/tonrytools
PATH=$PATH:$HOME/ffmpeg
PATH=$PATH:$HOME/ImageMagick-6.8.9-0/bin
PATH=$PATH:$HOME/cfitsio
https://github.com/mcoughlin/fisheye.git
3. Create master catalog for all stars by looking at photometry over all the nights2. [coughlin@lsst-dev ~]$ pwd
/lsst/home/coughlin
# User specific environment and startup programs
PATH=$PATH:$HOME/bin
PATH=$PATH:$HOME/allsky/bin
PATH=$PATH:$HOME/wcstools-3.8.7/bin
PATH=$PATH:$HOME/fisheye
PATH=$PATH:$HOME/sextractor-2.19.5/bin
PATH=$PATH:$HOME/tphot
PATH=$PATH:$HOME/tonrytools
PATH=$PATH:$HOME/ffmpeg
PATH=$PATH:$HOME/ImageMagick-6.8.9-0/bin
PATH=$PATH:$HOME/cfitsio
https://github.com/mcoughlin/fisheye.git
- CS: There are existing catalogs of stars, for example the paper I sent you with bright stars and their griz-band magnitudes. It's better to get an external catalog
with excellent astrometry than to make our own, I think.
4. Abi (dophot) can fit individual images to extract magnitudes (compare with tphot/source extractor)
5. Search for transients with image subtraction (pixel by pixel image difference)
-> Convert (x,y) to RA/Dec (w/ fisheye)
- CS: Converting to RA, DEC is not enough. We'd have to rotate the images about the celestial pole, match PSF and sky, and then subtract.
Sounds hard.
6. For a given star, plot the magnitude differences vs fractional pixel remainder of the centroid (1024.35 -> 0.35) -> probably worst for R/B due to 1 pixel, different for x and y
7. Can see milky way in cloud plots -> problem with sky brightness in photometry. Fix!