A Deeper Solution to the Actual Geometry of CCD Mosaic Chips. (arXiv:2107.12691v2 [astro-ph.IM] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Zheng_Z/0/1/0/all/0/1">Z.J. Zheng</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Peng_Q/0/1/0/all/0/1">Q.Y. Peng</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vienne_A/0/1/0/all/0/1">A. Vienne</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lin_F/0/1/0/all/0/1">F.R. Lin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Guo_B/0/1/0/all/0/1">B.F. Guo</a>

We present a solution to determine the actual or physical relative positions
between CCD chips. Taking into consideration there may be few stars identified
from Gaia catalog for astrometric calibration on the deep observation of large
ground-based or space-base telescope such as the planned Chinese Space Station
Telescope (CSST), we refer to the idea from the astrometry of the Hubble Space
Telescope (HST), to only use stars’ pixel positions to derive the relative
positions between chips. We refer to the practice as differential astrometry in
this paper. In order to ensure the results are reliable, we take advantage of
Gaia EDR3 to derive the relative positions between chips as Wang et al. (2019),
to provide a close comparison. We refer to the practice as photographic
astrometry.

We present a solution to determine the actual or physical relative positions
between CCD chips. Taking into consideration there may be few stars identified
from Gaia catalog for astrometric calibration on the deep observation of large
ground-based or space-base telescope such as the planned Chinese Space Station
Telescope (CSST), we refer to the idea from the astrometry of the Hubble Space
Telescope (HST), to only use stars’ pixel positions to derive the relative
positions between chips. We refer to the practice as differential astrometry in
this paper. In order to ensure the results are reliable, we take advantage of
Gaia EDR3 to derive the relative positions between chips as Wang et al. (2019),
to provide a close comparison. We refer to the practice as photographic
astrometry.

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