Summary of MD02.refstack.20120827

Similar to the MD02.GR0 (MD.GR0) refstacks for the 2011/2012 season, these include recent improvement and input cuts to help constrain the convolved stacks as well. Because the refstack is made with reprocessed pixels, the refstack pixels will now have the ubercalibration.

MD02 observations started Sept. 27 (ended last season started mid-Sept. and ended of February).

Filter	N total	N (FWHM<8 pixels)
g	331	260
r	327	281
i	427	386
z	509	483
y	386	340

MD02.V3 Processing

Exposure reprocessing was done for only a limited number (~150) from 2010+2011 to provide a balance of N input warps versus best seeing, excluding exposures with large background, low zeropoints and large elongation. Processing chip-warp and the refstack itself has the same label, data_group

• label: MD02.refstack.20120927
• data_group: MD02.refstack.20120927

	Histograms of the FWHM major and minor from camera stage for reprocessed all exposures (red) and refstack.20120927 (top blue) and refstack.2011 (bottom blue).

Test stack (reftest) sample also made again for skycell.055 with different number of input warps. Found skycell.055 may not be a good indicator of FWHM with different number of inputs, also did sample for skycell.033.

• label: MD02.reftest.20120927
• data_group:
  • MD02.reftest.20120927.c#f<FWHM cut> where #=comparison run, <FWHM cut>=cut <fwhm_major from camProcessedExp
  • MD02.reftest.20120927.all.<FWHM cut> where all means 2009+2010+2011 data possible, <FWHM cut>=cut <fwhm_major from camProcessedExp
  • MD02.reftest.20120927.2011.<FWHM cut> where 2011 means 2011 data only, <FWHM cut>=cut <fwhm_major from camProcessedExp

Summary comparison table with the approximate FWHM (major) as the PSF FWHM from a center field skycell (V3=055) after running psphot on the stacks. Because the reftests were all run on the same date, the stack_id is important to note to separate by filter as well.

version data_group (stack_id)	filter	center skycell.055 input warps (rej)	center skycell.055 FWHM (major)	skycell.033 input warps (rej)	skycell.033 FWHM (major)
new MD02.refstack.20120927 V3	g	()	"	()	"
MD02.reftest.20120927.c1f V3 ()	g	()	"	()	"
MD02.reftest.20120927.c1f V3 ()	g	()	"	()	"
MD02.reftest.20120927.c1f V3 ()	g	()	"	()	"
MD02.reftest.20120927.c1f V3 ()	g	()	"	()	"
old MD02.refstack.2011 V3	g	()	"	()	"
new MD02.refstack.20120927 V3	r	()	"	()	"
MD02.reftest.20120927.c1f V3 ()	r	()	"	()	"
old MD02.refstack.2011 V3	r	()	"	()	"
new MD02.refstack.20120927 V3	i	()	"	()	"
MD02.reftest.20120927.c1f V3 ()	i	()	"	()	"
old MD02.refstack.2011 V3	i	()	"	()	"
new MD02.refstack.20120927 V3	z	()	"	()	"
MD02.reftest.20120927.c1f V3 ()	z	()	"	()	"
old MD02.refstack.2011 V3	z	()	"	()	"
new MD02.refstack.20120927 V3	y	()	"	()	"
MD02.reftest.20120927.c1f V3 ()	y	()	"	()	"
old MD02.refstack.2011 V3	y	()	"	()	"

Problems:

Reftest Results

Refstack Comparisons