Allsky images from a camera in Copenhagen, Denmark.

Dark-frame subtracted R G and B images of the night sky from a camera in Copenhagen Denmark. Each file is a tar.gz archive with several files in, each labelled with the Bayer-filter type (R,G or B). Each FITS file in the decompressed archive is the result of subtracting an average darkframe from the average of several sky frames. The dark frames were obtained seconds before the sky image. Each sky image exposure time is 16 seconds. The camera used is a ZWO camera and it obtains its images with a CMOS sensor producing 14-bit RAW images. The FITS files are 16-bit.

本数据集包含丹麦哥本哈根地区一台相机拍摄的、经暗帧扣除处理的夜空红（R）、绿（G）、蓝（B）波段图像。每个文件均为tar.gz格式压缩归档包，内含多个子文件，每个子文件均标注有对应的拜耳滤镜（Bayer-filter）类型（R、G或B）。解压后的归档包中的每个FITS格式文件（FITS），均为多张夜空图像的平均值减去平均暗帧后的结果。对应暗帧的拍摄时间仅早于该组夜空图像数秒。单张夜空图像的曝光时长为16秒。本次使用的相机为ZWO相机，该相机搭载CMOS传感器，可输出14位RAW格式图像。该数据集的FITS格式文件均为16位深度。