Sunspot data for 18 February 2023 of period 2023Q1: (PREV DAY - NEXT DAY)
| Sun230218_1303UTC_sketch.jpg | Sun230218_1314UTC_lum.jpg |
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 |  Click here for the sharpened image. |
Today again it was fully overcast, and turned into a thick cirrus and contrails for a while in the afternoon. Transparency was poor, and the scintillation monitor reported poor to very poor seeing on average. I made the following observation:
Observation date/time: 18 February 13:03 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): 1.100ms (using 82nm bandwidth green filter) Seeing (SSSMon): 3.0-10.0" (1.5" at best) =================================================================== Total number of sunspots: 19 | |
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