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Table 5.
Photometric parameters.
| J0723 | J0819 | J0840 | J1347 | J1445(a) | |
|---|---|---|---|---|---|
| Magnitude zero-point (ZP)(b) [mag] | 28.30 | 28.18 | 28.18 | 28.18 | 28.18 |
| Extinction (E)(b) [mag] | 0.105 | 0.087 | 0.100 | 0.074 | 0.100 |
| Airmass (AM) | 1.27 | 1.22 | 1.19 | 1.05 | 1.17 |
| FWHM [pixel] | 2.64 | 3.26 | 3.25 | 2.56 | 3.46 |
| FWHM [″] | 0.67 | 0.82 | 0.82 | 0.64 | 0.87 |
| σsky | 0.12 | 0.15 | 0.16 | 0.11 | |
| Detection limit(c) [5σ; mag] | 27.48 | 26.87 | 26.86 | 27.57 | 24.50 |
| X-ray-to-optical flux ratio [5σ] | > 3000 | > 5400 | > 3100 | > 3300 | 200 |
| Distance to nearest optical neighbour [″] | 2.43 | 3.65 | 3.53 | 2.70 | 0.14 |
Notes.
(b)
Nightly zero-point and extinction values applied from the FORS Absolute Photometry project (https://archive.eso.org/qc1/qc1_cgi?action=qc1_browse_tabletable=fors2_photometry).
(c)
5σ detection limit calculated as in Kurpas et al. (2025).
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