All-sky Relative Opacity Mapping Using Night Time Panoramic Images

Details All-sky Relative Opacity Mapping Using Night Time Panoramic Images All-sky Relative Opacity Mapping Using Night Time Panoramic Images

2005-06-15

arxiv.org/abs/astro-ph/0506354v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in PASP

Scientific paper

10.1086/432689

An all-sky cloud monitoring system that generates relative opacity maps over many of the world's premier astronomical observatories is described. Photometric measurements of numerous background stars are combined with simultaneous sky brightness measurements to differentiate thin clouds from sky glow sources such as air glow and zodiacal light. The system takes a continuous pipeline of all-sky images, and compares them to canonical images taken on other nights at the same sidereal time. Data interpolation then yields transmission maps covering almost the entire sky. An implementation of this system is currently operating through the Night Sky Live network of CONCAM3s located at Cerro Pachon (Chile), Mauna Kea (Hawaii), Haleakala (Hawaii), SALT (South Africa) and the Canary Islands (Northwestern Africa).

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