月亮上的直壁
月亮上的直壁 , 在月亮南部山區與雲海的交界 , 有一道長120 km (10個香港島由東至西的距離 ), 高 240-300 m(半個太平山的高度) , 從前認為它是個懸崖峭壁 , 後來的觀測證實它應是一個傾斜約15度的正斷層大斜坡 .圖中還見月溪 , 及西北區的皺摺平原 .
Straight Wall length 120 km, height 240-300 m, Rupes Recta on Southern Part of The Moon , 2017/10/30 HKT: 20h50m,
Telescope TEC Maksutov-Cassegrain MC200/20, D=20cm, F.L.=400cm, Prime Focus,
Losmandy G-11 Equatorial Mount with motor drive.Camera ZWO ASI 120MC CMOS Web Cam,
Shoot at 20 frames/sec, stack and optimize 600 in 859 frames with Software RegiStax V5 .
Atmospheric Transparent : 7/10, Seeing : 6/10. Equipment borrowed from Mr. Ng. Taken at Kennedy Town, Hong Kong.
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