Sunspot data for 17 February 2023 of period 2023Q1: (PREV DAY - NEXT DAY)
| Sun230217_1419UTC_sketch.jpg | Sun230217_1426UTC.jpg |
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 |  Click here for the sharpened image. |
Today it was fully overcast, but it turned into a thick haze for a while in the afternoon. Transparency was very poor, and the scintillation monitor reported good to mediocre seeing on average. I made the following observation:
Observation date/time: 17 February 14:19 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 (341mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 1.900ms (using 82nm bandwidth green filter) Seeing (SSSMon): 1.5-3.0" (0.5" at best) =================================================================== Total number of sunspots: 20 | |
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