Sunspot data for 17 February 2026 of period 2026Q1: (PREV DAY - NEXT DAY)
| Sun260217_1015UTC_sketch.jpg | Sun260217_1019UTC.jpg |
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 |  Click here for the sharpened image. |
today we had patches of cumuli with showers and clearances in between. Transparency in them was very good, and the scintillation monitor reported reasonable seeing on average. I made the following observation:
Observation date/time: 17 February 2026 10:15 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 (338mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 0.530ms (using 82nm bandwidth green filter) Seeing (SSSMon): 2.5-3.0" (1.4" at best) =================================================================== Total number of sunspots: 11 | |
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