Distribution of PSF of The Near Earth Object Survey Telescope |
| |
| Institution: | 1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008;2. Graduate University of Chinese Academy of Sciences, Beijing 100049;1. Department of Mathematics, Texas A&M University 3368 TAMU, College Station, TX 77843-3368, USA;2. Department of Mathematical and Statistical Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2G1;1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
| |
| Abstract: | The CCD field of view of the Near Earth Object Survey Telescope (NEOST) is 1.94°xl.94°. As a wide-field telescope, the focusing based on a single star will lead to an uneven distribution of PSF (Point Spread Function) on the CCD image due to the field curvature. The features of the PSF distribution on the CCD image are studied. By fitting the relation between the defocusing and the FWHM (Full Width at Half Maximum) of PSF, the curved focal surface is simulated and therefore the best imaging plane is determined. Hereby, a focusing method based on the optimum imaging plane determined by judging the histogram of FWHM is proposed. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
