Sunspot data for 21 October 2021 of period 2021Q4: (PREV DAY - NEXT DAY)

Sun211021_1348UTC_sketch.jpgSun211021_1354UTC.jpg


This morning again it was fully overcast with rain and heavy winds, but in the afternoon a large clearance appeared, be it still with enough wind. Transparency was mediocre, seeing reasonable. I made the following observation: 
Observation date/time:   21 October 13:48 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): 0.260ms
Seeing (SSSMon):         3.0"-3.5"

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Total number of sunspots:   1

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