Sunspot data for 13 August 2023 of period 2023Q3: (PREV DAY - NEXT DAY)
| Sun230813_1453UTC_sketch.jpg | Sun230813_1457UTC.jpg |
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 |  Click here for the sharpened image. |
Today started out almost fully overcast with minor gaps passing by too fast for observations. In the afternoon it started to clear with patches of stratus covering some 60% of the sky. Transparency in between was excellent, and the scintillation monitor reported good seeing on average. I made the following observation:
Observation date/time: 13 August 2023 14:53 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 (350mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 0.400ms (using 82nm bandwidth green filter) Seeing (SSSMon): 2.5-3.5" (2.0" at best) =================================================================== Total number of sunspots: 20 | |
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