Sunspot data for 13 March 2023 of period 2023Q1: (PREV DAY - NEXT DAY)
| Sun230313_0920UTC_sketch.jpg | Sun230313_0923UTC_lum.jpg |
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 |  Click here for the sharpened image. |
Today started out grey with a fierce wind (8Bft). Later it cleared completely, but the wind remained. Luckily the wind came from the south-west while the observation was done direction south-east, so the scopes were sheltered inside the dome. Transparency was good, and the scintillation monitor reported very good seeing on average. I made the following observation:
Observation date/time: 13 March 09:20 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): 0.550ms (using 82nm bandwidth green filter) Seeing (SSSMon): 1.5"-1.6" (1.0" at best) =================================================================== Total number of sunspots: 23 | |
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