Sunspot data for 23 September 2023 of period 2023Q3: (PREV DAY - NEXT DAY)
| Sun230923_1008UTC_sketch.jpg | Sun230923_1011UTC.jpg |
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 |  Click here for the sharpened image. |
Today started out grey and wet again, but by the end of the morning some large clearances appeared. Transparency was good, but the scintillation monitor reported poor good seeing on average. I made the following observation:
Observation date/time: 23 September 2023 10:08 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 (349mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 0.450ms (using 82nm bandwidth green filter) Seeing (SSSMon): 4.5-6.0" (2.5" at best) =================================================================== Total number of sunspots: 30 | |
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