Sunspot data for 13 October 2025 of period 2025Q4: (PREV DAY - NEXT DAY)
| Sun251013_1554UTC_sketch.jpg | Sun251013_1609UTC.jpg |
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 |  Click here for the sharpened image. |
today it was grey, but shortly before sunset it cleared to about 80% cumuli. Transparency in between was poor due to the low altitude, but the scintillation monitor reported good seeing on average. I made the following observation:
Observation date/time: 13 October 2025 15:54 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 (347mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 1.580ms (using 82nm bandwidth green filter) Seeing (SSSMon): 1.5-2.0" (1.3" at best) =================================================================== Total number of sunspots: 33 | |
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