Sunspot data for 16 August 2025 of period 2025Q3: (PREV DAY - NEXT DAY)
| Sun250816_1644UTC_sketch.jpg | Sun250816_1647UTC.jpg |
|---|---|
 |  Click here for the sharpened image. |
Today started out grey, but by the end of the day it cleared completely. Transparency was good, but the scintillation monitor reported mediocre to poor seeing on average. I made the following observation:
Observation date/time: 16 August 2025 16:44 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 (350mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 0.530ms (using 82nm bandwidth green filter) Seeing (SSSMon): 4.0-5.5" (3.0" at best) =================================================================== Total number of sunspots: 15 | |
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