Changes between Version 9 and Version 10 of MOPS_diff_false_positives
- Timestamp:
- Nov 13, 2012, 4:08:54 PM (14 years ago)
Legend:
- Unmodified
- Added
- Removed
- Modified
-
MOPS_diff_false_positives
v9 v10 41 41 42 42 43 These plots are the same, but showing the relations between diff_rm/diff_sn_m for the different diff images (the plot labels are incorrect; these are the M versions). These measurements are somewhat less obvious than for the P versions. Although the signal to noise ratios (diff_sn_p / mops_sn and diff_sn_m / mops_sn) are similar for the warp-warp diff detections of asteroids, the diff_rm is not as small as for diff_rp. This is reasonable, as the minus source is assumed to have moved between exposures. The stellar sources occupy the same SNR/R space as in the P version, as the same residual issues create the matches. 43 These plots are the same, but showing the relations between diff_rm/diff_sn_m for the different diff images (the plot labels are incorrect; these are the M versions). These measurements are somewhat less obvious than for the P versions. Although the signal to noise ratios (diff_sn_p / mops_sn and diff_sn_m / mops_sn) are similar for the warp-warp diff detections of asteroids, the diff_rm is not as small as for diff_rp. This is reasonable, as the minus source is assumed to have moved between exposures. The stellar sources occupy the same SNR/R space as in the P version, as the same residual issues create the matches. The MOPS cut on diff_rm may exclude objects with large shifts, and should probably be relaxed. If a source has a small diff_rp, and diff_sn_p / mops_sn ~= diff_sn_m / mops_sn, then requiring that diff_rm be less than 9 can exclude faster moving objects. 44 44 45 45 Warp-stack diffs are far less likely to have a correct minus source associated, as any objects moving through the warp field is unlikely to have been there during the frames used for the stack. As a result, the S/N ratio for known asteroid objects has a large amount of scatter, indicating that a random minus source is being associated with these objects.
