Table 1.
Measured astrometry and photometry.
| Image | ΔRA (″) | ΔDec (″) | r (mag) |
|---|---|---|---|
| A | −1.348 ± 0.003 | 0.966 ± 0.003 | 18.21 ± 0.02 |
| B | 0.054 ± 0.003 | 2.293 ± 0.003 | 18.62 ± 0.02 |
| C | −1.227 ± 0.003 | −1.387 ± 0.003 | 19.01 ± 0.02 |
| D | 1.915 ± 0.004 | −0.340 ± 0.004 | 19.93 ± 0.02 |
| E | −0.747 ± 0.015 | −2.644 ± 0.015 | 20.60 ± 0.03 |
| F | 1.35 ± 0.07 | 1.11 ± 0.07 | 22.50 ± 0.10 |
| G | 0.494 ± 0.018 | 0.120 ± 0.018 | – |
Notes. Data are based on the deconvolution of NOT StanCam imaging of J1721+8842. Uncertainties are estimated based on the S/N as described in the text. Photometry is measured on the best-seeing single epoch (from 30 May 2021). The galaxy position and uncertainty are measured by fitting a PSF-convolved Sersic to the extended component of the image (panel c of Fig. 1). The magnitudes are calibrated to match those from Gaia, and so should not be taken as an absolute calibration given the different bandpasses.
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