月亮的直壁
本帖最後由 C.L.Chan 於 2019-2-14 21:10 編輯每逢上下弦月時 , 是拍攝月亮的直壁的最佳時刻 , 它在月亮南部山區 , 是一道長120 km (10個香港島由東至西的距離 ), 高300到400m , 從前認為它是個懸崖峭壁 , 後來的觀測證實它應是個傾斜約15度的大斜坡(正斷層) . 直壁左邊還見月溪 Rupes Recta.
Straight Walllength 120 km, height 300~400 m, with Rupes Recta on Southern Part of TheMoon ,2019/02/13 UT: 12h31m, Telescope TEC Maksutov-Cassegrain MC200/20, D=20cm,F.L.=400cm, Prime Focus,Losmandy G-11 Equatorial Mount with motor drive. Camera QHY 5III 224 ColorCam, frame size 1280x960, Shoot at Gamma=114, Gain=27, Expo 3.5ms, 27frames/sec, stack and process 30% best frames with Software AstroStackert 3 , RegiStaxV.6 , GIMP & Microsoft Photo software, Atmospheric condition : Transparent: 8/10, Seeing : 7/10. Equipment borrowed from Mr. Ng. Photo taken atKennedy Town堅尼地城, Hong Kong.
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