黑子的尾群已消退了

C.L.Chan

今午太陽黑子的尾群已消退了, Sunspot group HKT: 2020/11/11, 13h45m Telescope: Astro Physics, Star 12 ED, D=12cm, Stop down to 2 inches, F.L.=102cm, Prime Focus, Thousand Oaks Glass solar filter ND3. Losmandy G-11 Equatorial Mount with motor drive. Canon EOS 700D camera, IR block filter removed, ISO 100, 1/4000 sec exposure, jpg format. Stacking 17 frames in 31 & Wavelet by RegiStax 6, Final touch by Microsoft Photo, Atmospheric Transparent: 8/10, Seeing: 8/10. Equipment borrowed from Mr. Ng. The location in this observation is Kennedy Town, Hong Kong 堅尼地城