The Parallax Zero-Point of Gaia Early Data Release 3 from LAMOST Primary Red Clump Stars
Yang Huang, Haibo Yuan, Timothy C. Beers, Huawei Zhang

TL;DR
This study assesses Gaia EDR3's parallax zero-point using LAMOST red clump stars, finding a median offset of 26 microarcseconds with dependencies on magnitude, color, and position, and proposing corrections to improve accuracy.
Contribution
It provides an independent analysis of Gaia EDR3's parallax zero-point using LAMOST red clump stars, identifying dependencies and proposing corrections for improved accuracy.
Findings
Median parallax offset of 26 μas detected
Dependencies on magnitude, color, and position confirmed
Significant residual offsets remain after correction
Abstract
We present an independent examination of the parallax zero-point of the Third Gaia Early Data Release (hereafter EDR3), using the LAMOST primary red clump (PRC) stellar sample. A median parallax offset of around as, slightly larger than that found by examination of distant quasars, is found for both the five- and six-parameter solutions in EDR3, based on samples of over 63,000 and 2000 PRC stars, respectively. Similar to the previous investigation of Lindegren et al., to which we compare our results, the parallax zero-point exhibits clear dependencies on the magnitudes, colors, and positions of the objects. Based on our analysis, the zero-point of the revised parallax can be reduced to a few as, and some significant patterns, e.g., discontinuities with stellar magnitude, can be properly removed. However, relatively large offsets (as) are still found for the…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
