Sunspot data for 4 October 2025 of period 2025Q4: (PREV DAY - NEXT DAY)
| Sun251004_0904UTC_sketch.jpg | Sun251004_0905UTC.jpg |
|---|---|
 |  Click here for the sharpened image. |
today started out wet, windy and grey, but it soon cleared to about 50% cumuli. Transparency was good, and the scintillation monitor reported good seeing on average. I made the following observation:
Observation date/time: 04 October 2025 09:04 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): 0.480ms (using 82nm bandwidth green filter) Seeing (SSSMon): 2.4-2.7" (1.0" at best) =================================================================== Total number of sunspots: 50 | |
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