Sunspot data for 17 December 2022 of period 2022Q4: (PREV DAY - NEXT DAY)
| Sun221217_1047UTC_sketch.jpg | Sun221217_1050UTC.jpg |
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 |  Click here for the sharpened image. |
Today we had clear skies with some 20% cumuli drifting inwards from the west. Transparency was mediocre, but the scintillation monitor reported very good seeing on average. I made the following observation:
Observation date/time: 17 December 10:47 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 (340mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 0.310ms Seeing (SSSMon): 1.5" (1.0" at best) =================================================================== Total number of sunspots: 28 | |
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