NIRC2 Sirius b ADI data

Pre-processed data from three epochs of observations with NIRC2 at the W.M. Keck II telescope. Each epoch is processed with a flat correction, bad pixel removal, and background removal (via high-pass filter). The subsequent data are co-registered and aligned to the center of the frame before cropping. The crop includes the inner 200 pixels, which corresponds to a maximum angular separation of 1 arcsecond at the edge of the frame. The parallactic angles are provided, too, calculated from the FITS headers including instrumental effects.本数据集为凯克二号望远镜（W.M. Keck II Telescope）搭载的近红外相机2（NIRC2）三次观测历元的预处理数据。每一轮观测历元的数据均经过平场校正、坏像素去除以及基于高通滤波器的背景去除处理。后续数据先完成帧中心配准与对齐，再进行裁切。裁切范围为图像内侧200像素区域，该区域边缘对应的最大角距离为1角秒。数据集同时提供视差角（parallactic angles）数据，其计算基于包含仪器效应在内的FITS头文件（FITS headers）。