Star Proper Motions Based on Two-epoch Observations from the SDSS and DESI Imaging Surveys

• DOI: 10.48550/arxiv.2405.04016
• Publication Date: 2024-05-07
• Authors: Yun-Ao Xiao; Hu Zou; Xin Xu; Feng Lu; Wei-Jian Guo; Wenxiong Li; Zhi-Xia Shen; Gaurav Singh; Jipeng Sui; Jiali Wang; Suijian Xue
• Keywords: Epoch (astronomy); Star (game theory)

In this study, we present the construction of a new proper motion catalog utilizing photometric data from Sloan Digital Sky Survey (SDSS) and Dark Energy Spectroscopic Instrument (DESI) imaging surveys, with median time baseline about 13 years. To mitigate systematic errors, DESI galaxy positions are employed to establish reference frame correct position-, magnitude-, color-dependent discrepancies between SDSS datasets. Spanning 12,589 square degrees, encompasses 206.6 million non-Gaia objects down $m_r \sim$ 23. Based on 734k quasars, assessment global errors in DESI-SDSS yields values 0.14 mas yr$^{-1}$ for $\mu_{\alpha *}$ 0.11 $\mu_{\delta}$. The exhibits precision surpassing 3.7 yr$^{-1}$, albeit varying position, color, magnitude. An additional evaluation employing approximately 5,300 distant star samples an overall 3.0 2.9 $\mu_{\delta}$, respectively. Further comparisons motions Stripe 82 reveal strong consistency two As practical application, utilize fainter our update 17 clusters. resulting these clusters exhibit excellent those derived Gaia data. Our measurements, characterized by deeper limiting magnitude, stands as valuable complement dataset. is publicly available at \url{https://www.scidb.cn/s/YzaIv2}.