Sunspot data for 9 October 2025 of period 2025Q4: (PREV DAY - NEXT DAY)
| Sun251009_0859UTC_sketch.jpg | Sun251009_0904UTC.jpg |
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 |  Click here for the sharpened image. |
today we had patches of dense cumuli with large clearances in between, topped with some contrails. Transparency in between was excellent, and the scintillation monitor reported good to mediocre seeing on average. I made the following observation:
Observation date/time: 09 October 2025 08:59 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): 0.430ms (using 82nm bandwidth green filter) Seeing (SSSMon): 2.0-4.0" (0.7" at best) =================================================================== Total number of sunspots: 9 | |
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