Night report 2025-08-07

Night report 2025/08/07

Observers: Joyce Naomi Dominique van Dalen  and  Daniele Bjørn Malesani.

Support:  Antonio Martin-Carrillo, Gregory Corcoran, Laura Cotter.

TAT: Lluis Galbany, Tanja Petrushevska, Shubham Srivastav.

Start (23:15 UT): humidity 35%, temperature 8.9 ºC, wind speed 5.1 m/s, seeing 1.8'', airmass 1.03.

Middle (05:40 UT): humidity 19%, temperature 8.7 ºC, wind speed 10.2 m/s, seeing 1.3'', airmass 1.37 

End (10:14 UT): humidity 12%, temperature 9.1 ºC, wind speed 9.2 m/s, seeing 2.0'', airmass 1.38 

Comments: visually no clouds at the during the night. Bad seeing over most of the night (~2"), improving only at the end of the night.

Calibrations: Afternoon calibrations: bias and spectroscopic flats. Due to technical work on the telescope, calibrations started late and could be completed (arcs are missing), and will be attempted tomorrow morning again.

In evening twilight: photometry flats in grz and i bands.
Morning calibrations: twilight photometric flats in UBVRi, and all arcs