Sunspot data for 17 September 2021 of period 2021Q3: (PREV DAY - NEXT DAY)
| No sketch made. | Sun210917_134141UTC.jpg |
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This day we started out fully overcast, but in the afternoon some clearances appeared, still with some 60% cumuli and a thin stratus. Transparency was poor, seeing reasonable to good. I made the following observation:
Observation date/time: 17 September 13:35 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): 0.320ms Seeing (SSSMon): 3.0-4.5" =================================================================== Total number of sunspots: 0 | |
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