This work aims to verify whether the DP2 data meet the photometric repeatability requirements of 5 mmag in the g, r, i bands and 7.5 mmag in the u, z, y bands, or if excess dispersion could be attributed to atmospheric variations not fully compensated by the photometric calibration algorithms.
We reconstruct light curves by grouping bright sources into objects using two methods: astrometric clustering within a 1-arcsecond radius or cross-matching with the external SIMBAD catalog to ensure the stability of the stars.
The PSF flux dispersion of sources relative to the object median is calculated and compared to the mean statistical error derived by the DRP, with photometric repeatability performance assessed across methods, Deep Drilling Fields (DDFs), and bands.
RCW2026-PhotometricRepeatabilityDP2-dagoret-short.pdf (1.4 MB)