Sunspot data for 15 August 2023 of period 2023Q3: (PREV DAY - NEXT DAY)
| Sun230815_1030UTC_sketch.jpg | Sun230815_1033UTC.jpg |
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 |  Click here for the sharpened image. |
Today started out almost fully overcast but around noon it cleared to about 20% cumuli, topped with some cirrus. Transparency in between was excellent, but the scintillation monitor reported mediocre seeing on average. I made the following observation:
Observation date/time: 15 August 2023 10:30 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): 0.380ms (using 82nm bandwidth green filter) Seeing (SSSMon): 3.5-4.0" (2.5" at best) =================================================================== Total number of sunspots: 22 | |
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