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右上具中央小山是弟谷環形山, 左下最大一個殘缺環坑是德朗達爾, 在40億年前形成. 這區有數之不盡的大小隕石坑,顯示了幾億年來的猛烈撞擊事件. Crater Tycho (upper right 86km) & Deslandres(Lower left 227km), UT 2021 04 21, 14h30m, Telescope TEC Maksutov-Cassegrain MC200/20,D=20cm, F.L.=400cm, Losmandy G-11 Equatorial Mount with motor drive. Camera QHY5III 224 Color Cam, Capture with FireCapture, Shoot at Gamma=100, Gain=37 Expo=0.413 ms/frame, avi format, stack and process 50% best frames in 1804 frames byfree Software AutoStakkert 3, wavelet with RegiStax V.6, Final touch byMicrosoft Photo software. Atmospheric condition: Transparent: 9/10, Seeing:8/10. Equipment borrowed from Mr. Ng. The photo was taken at Kennedy Town 堅尼地城,Hong Kong.
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發表於 2021-4-26 08:59:09