Saturn and Tethys 19.09.2026

Transit of Tethys and its shadow across Saturn on the night of 19.09.2026. Seeing 6/10 - fine details were being smeared again and the near-ground layer was making itself felt. Stars by Pickering 5/10.
Sum of six stacks of 90 seconds each. Derotation in WinJupos.
19.09.26, 01:10 Moscow time.
Ulyanovsk. Cassegrain 343/5800, PlayerOne Mars-C II (662), AS!4 (Drizzle 1.5x), AstroSurface V3-VOLCANO, FitsWork4, PS.
Diameter=19.53"
Magnitude=0.39
Altitude=37.94°
CMI=77.3° CMIII=197.4°  (during mid of capture)
FocalLength=5800mm (F/17)
Resolution=0.10"
ROI=800x500
Shutter=16.67ms
Gain=444 (55%)
Histogramm=60%
Limit=90 Seconds