Sunspot data for 4 June 2025 of period 2025Q2: (PREV DAY - NEXT DAY)
| Sun250604_0833UTC_sketch.jpg | Sun250604_0835UTC.jpg |
|---|---|
 |  Click here for the sharpened image. |
Today we had about 10% cumuli. Transparency in between was reasonable, and the scintillation monitor reported reasonable seeing on average. I made the following observation:
Observation date/time: 04 June 2025 08:33 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 (348mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 0.580ms (using 82nm bandwidth green filter) Seeing (SSSMon): 3.0-3.5" (2.0" at best) =================================================================== Total number of sunspots: 19 | |
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