Sunspot data for 17 December 2023 of period 2023Q4: (PREV DAY - NEXT DAY)
| Sun231217_1245UTC_sketch.jpg | Sun231217_1250UTC.jpg |
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 |  Click here for the sharpened image. |
Today started out grey, but in the afternoon it cleared completely, albeit with some tiny patches of very thin stratus. Transparency was poor, but the scintillation monitor reported good seeing on average. It failed, however, to quantify the large undulations which made the sun look like rubber. I made the following observation:
Observation date/time: 17 December 2023 12:45 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 (339mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 0.800ms (using 82nm bandwidth green filter) Seeing (SSSMon): 1.5-2.5" (1.0" at best) =================================================================== Total number of sunspots: 12 | |
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