編號 M42

C.L.Chan

獵戶座大星雲 , 編號 M42,是氣體及恆星殘留物再次聚集形成恆星的地方 . 天的背景太亮, 每張只能曝光 20秒 (x 51).

M42 in Orion, 13 min exposure. 2019/11/22,  HKT 23h12m to 38m , Telescope: Astro Physics, Star 12 ED, D=12cm, F.L.=102cm, Prime Focuswith field flattener lens and Astronomik light pollution filter, Losmandy G-11Equatorial Mount with motor drive. Manual object targeting. Canon EOS 700DCamera , IR Low pass filter removed. ISO 3200, 20 sec exposure each, jpgFormat. Stack Light frames 40 in 51x, Dark frames 10x, Bias frames 10x, flatframes 10x. Stacking by Deep Sky Stacker freeware and post-processed by GIMP& Microsoft photo . Atmospheric Transparent :8/10, Seeing :8/10.  Equipment borrowed from Mr. Ng. Taken atKennedy Town, 堅尼地城Hong Kong.