Sunspot data for 21 March 2023 of period 2023Q1: (PREV DAY - NEXT DAY)
| Sun230321_1626UTC_sketch.jpg | Sun230321_1632UTC.jpg |
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 |  Click here for the sharpened image. |
Today we started out grey, but in the afternoon it suddenly cleared completely for half an hour. Transparency was poor, but the scintillation monitor reported excellent seeing on average. I made the following observation:
Observation date/time: 21 March 16:26 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 (342mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 0.850ms (using 82nm bandwidth green filter) Seeing (SSSMon): 1.0"-1.5" (0.8" at best) =================================================================== Total number of sunspots: 12 | |
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