NGC7293 Helix Nebula


Date: 7 July night, 2003

Telescope: Celestron 8 SCT with stabilized mirror, on Gemini G-41 mount

Guiding: ST-4 Autoguider with Celestron C80, 80mm F11 refractor piggybacked on C8.

Camera: MX916 with IDAS LPS filter, behind a Meade 0.63 reducer

Location: Tai Mei Tuk, Hong Kong

Exposure: 14 x 5mins

Software: Image acquisition by Astroart, calibration and auto-alignment by AIP4win, sigma-combined by Sigma, R-L deconvolution by AIP4win, and final brightness adjustment by Astroart