Sub-Pixel Calibration of CMOS Sensors for Precision Astrometry

[2608.14874] Sub-Pixel Calibration of CMOS Sensors for Precision Astrometry Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search Astrophysics > Instrumentation and Methods for Astrophysics arXiv:2608.14874 (astro-ph) [Submitted on 14 Aug 2026] Title: Sub-Pixel Calibration of CMOS Sensors for Precision Astrometry Authors: M. Shao , I. Hahn View a PDF of the paper titled Sub-Pixel Calibration of CMOS Sensors for Precision Astrometry, by M. Shao and I. Hahn View PDF HTML (experimental) Abstract: Many sources of systematic error are important to centroid the position of a star below the level of $10^{-4}$ of the FWHM of the stellar image. One of the more important sources of centroiding error is the imperfect position of the pixels in a focal plane array. In this paper, we discuss the calibration of pixel position of multiple commercial CMOS detectors. Focal plane arrays are semiconductor devices fabricated with 10's nanometer precision. However, the effective location of a pixel can be biased if there's a QE gradient across the pixel. We typically see pixel position variations of 1--3\% of a pixel in most CMOS imagers. This paper describes how we measure the position of each pixel below the $10^{-3}$ pixel level. We also describe how this information might be used in a least square fitting of an airy spot to obtain a higher accuracy position of the centroid of the PSF. Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM) Cite as: arXiv:2608.14874 [astro-ph.IM] (or arXiv:2608.14874v1 [astro-ph.IM] for this version) https://doi.org/10.48550/arXiv.2608.14874 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Inseob Hahn [ view email ] [v1] Fri, 14 Aug 2026 20:26:08 UTC (7,575 KB) Full-text links: Access Paper: View a PDF of the paper titled Sub-Pixel Calibration of CMOS Sensors for Precision Astrometry, by M. Shao and I. Hahn View PDF HTML (experimental) TeX Source view license Current browse context: astro-ph.IM < prev | next > new | recent | 2026-08 Change to browse by: astro-ph References & Citations NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer ( What is the Explorer? ) Connected Papers Toggle Connected Papers ( What is Connected Papers? ) Litmaps Toggle Litmaps ( What is Litmaps? ) scite.ai Toggle scite Smart Citations ( What are Smart Citations? ) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv ( What is alphaXiv? ) Links to Code Toggle CatalyzeX Code Finder for Papers ( What is CatalyzeX? ) DagsHub Toggle DagsHub ( What is DagsHub? ) GotitPub Toggle Gotit.pub ( What is GotitPub? ) Huggingface Toggle Hugging Face ( What is Huggingface? ) ScienceCast Toggle ScienceCast ( What is ScienceCast? ) Demos Demos Replicate Toggle Replicate ( What is Replicate? ) Spaces Toggle Hugging Face Spaces ( What is Spaces? ) Spaces Toggle TXYZ.AI ( What is TXYZ.AI? ) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower ( What are Influence Flowers? ) Core recommender toggle CORE Recommender ( What is CORE? ) IArxiv recommender toggle IArxiv Recommender ( What is IArxiv? ) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs . Which authors of this paper are endorsers? | Disable MathJax ( What is MathJax? ) We gratefully acknowledge support from our major funders , member institutions , , and all contributors. About · Help · Contact · Subscribe · Copyright · Privacy · Accessibility · Operational Status (opens in new tab) Major funding support from

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