Sunspot data for 11 December 2025 of period 2025Q4: (PREV DAY - NEXT DAY)
| Sun251211_1034UTC_sketch.jpg | Sun251211_1040UTC.jpg |
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 |  Click here for the sharpened image. |
today it was mainly overcast, but a small opening allowed for observation. Transparency was poor, but the scintillation monitor reported excellent seeing on average. I made the following observation:
Observation date/time: 11 December 2025 10:34 UTC Telescope: GTT60 (Galileo Type Telescope) Focal length: 1490mm (plano convex singlet) Aperture: 60mm Stop: 30mm Eyepiece: -75mm (plano concave singlet, 24mm aperture) Observation type: projection (338mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 1.180ms (using 82nm bandwidth green filter) Seeing (SSSMon): 1.1-1.3" (0.7" at best) =================================================================== Total number of sunspots: 20 | |
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