Saturn (North up) Seeing: 4/5 Capture details: Date: 20200715 14:55 (UTC) Telescope: Celestron C8-A XLT FocalLength: ~4000mm (2X Powermate) Mount: Rainbowastro RST-135 Camera: QHYCCD QHY224C + QHY290M with ADC Exposure: 3mins RGB (1min each) + 9mins L (1min each); stacked 70% Processed: AS, RS, WinJUPOS, PS

下星期愈嚟愈凍，大家小心感冒

NGC 7009 Saturn Nebula 在大家追彗星的同時試下觀察一下另類星體 Saturn Nebula是一個行星狀星雲 (planetary nebula), 中心是一顆視星等11.5等的白矮星, 因為外型似土星, 所以有土星星雲之稱 Capture details: Date: 20200718 Telescope: Celestron C8-A XLT FocalLength: ~4000mm (2X Powermate) Mount: Rainbowastro RST-135 Camera: QHYCCD QHY290M Exposure: 3sec * 60frames stacked 80% Processed: AS, PS