Sunspot data for 21 April 2023 of period 2023Q2: (PREV DAY - NEXT DAY)
| Sun230421_1253UTC_sketch.jpg | Sun230421_1259UTC.jpg |
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 |  Click here for the sharpened image. |
Today it was fully overcast, but around noon thin enough to observe. Transparency was poor, and the scintillation monitor reported poor seeing on average. I made the following observation:
Observation date/time: 21 April 2023 12:53 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 (345mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 1.400ms (using 82nm bandwidth green filter) Seeing (SSSMon): 4.0"-6.0" (2.5" at best) =================================================================== Total number of sunspots: 18 | |
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