Sunspot data for 5 September 2021 of period 2021Q3: (PREV DAY - NEXT DAY)

Sun210905_0954UTC_sketch.jpgSun210905_1018UTC.jpg


Today we finally have a cloudless day, although there is some very thin stratus. Transparency was good, seeing mediocre. I made the following observation: 
Observation date/time:   05 September 09:54 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 (351mm distance, 80mm diameter)
Reference:               Earth's rotation axis
Exposure (transparency): 0.190ms
Seeing (SSSMon):         5

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Total number of sunspots:    17

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