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Principal:
Deputy:
Analyst:
AORKEYS:
Last Updated:

Task Outcome Summary

DATA STATUS: Nominal
TASK OUTCOME: Nominal

Abstract

This is the routine 24µm flux calibration. The target was HD159330. The calibration is 1.5e5 DN/s/Jy and is well-matched to previous calibration measurements within the uncertainties.

Analysis

The data were reprocessed with version 2.41 of the DAT, using the campaign K dark and scan mirror dependent flats from campaign K. A centroid measurement and aperture photometry was performed on the star in each of 30 DCEs. These data were used to derive a flux calibration. The data were coadded to make a mosaic using mips_enhancer with the offset list. The WCSs in a few DCEs are still ~1-2 pixels off.

Results

Data Collected

As expected, this task generated a total of 30 Si:As DCEs on the star and 7 more in the stim IER. Using the scan mirror dependent flats, the dark spots caused by dusts on pick-up mirror have been correctedly flat-fielded. For comparison, Figure 1 (a) shows the mosaic image using regular flats while figure 1 (b) shows the mosaic image using the scan mirror dependend flats.

Figure 1a: Mosaic image using regular flat

Figure 1b: Mosaic image using scan mirror dependent flats

System Throughput

The total counts from the star in all 30 DCEs are computed using IDL program with the same aperture parameters as Chad's from previous campaigns. The counts are 6.962e+04 ± 1.154e+03 (1.7%) DN/s (ignoring the boost DCEs), and the distribution is shown in Figure 2. Using the aperture correction of 1.146, the total counts from the target is 7.979e+04 DN/s, so the ratio of DN/s to Jy is 1.48e5. This conversion factor is very similar to that measured for this star during other campaigns.

Figure 2: Counts for HD159330 as a function of DCE number.

Stimulator

The stimulator IER behaved as expected, producing 7 images of the flat-field stimulator. The data were processed with mips_sloper in a fashion identical to that described above for the sky images. Figure 3 shows the historgram over the whole array in individual DCE. The 5-sigmaclip mean value is also listed in each DCE. (Note that 1st DCE has SUR on-broad algorithm wrong, so the statistics from DCE#1 should be ignored.)

Figure 3: Histrogram on the Stim over DCEs

Conclusions

The 24µm flux calibration continues to be stable.
The pointing reconstruction is now present for all images.

Output and Deliverable Products

The flux calibration is delivered in this writeup. The calibration images and mosaic are available should they be needed.