Saturn

C.L.Chan

今年的土星沖在7月10日 , 即全年視徑最大的時段 (18.4角秒), 這晚仍有 18.2角秒 .

Saturn, 2019/07/23 HKT: 22h24m, Telescope TECMaksutov-Cassegrain MC200/20, D=20cm, F.L.=400cm, with 2x Powermate , E.F.L. =8 meters, Losmandy G-11 Equatorial Mount with motor drive. Camera QHY 5III 224 Color Cam, frame size 656x424 px, Shoot at Gamma=100, Gain=45,Expo 4.5ms, 116 frames/sec, avi format, stack and process 50% best frames in 21618frames,­ with Software AstroStackert 3 , wavelet with RegiStax V.6 ,   Atmospheric condition : Transparent : 9­/10,Seeing : 7/10. Equipment borrowedfrom Mr. Ng. Photo taken at Kennedy Town堅尼地城, Hong Kong.