Experimental tests of the calibration of high precision differential astrometry for HWO
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914091427168256 |
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| author | Lizzana, Manon Malbet, Fabien Leger, Alain Pancher, Fabrice Soler, Sébastien Rousset, Hugo Lepine, Thierry Michelot, Julien Er-Rahmaouy, Yahya Bakka, Youssef |
| author_facet | Lizzana, Manon Malbet, Fabien Leger, Alain Pancher, Fabrice Soler, Sébastien Rousset, Hugo Lepine, Thierry Michelot, Julien Er-Rahmaouy, Yahya Bakka, Youssef |
| contents | Many different scientific applications require sub-micro arcsecond precision astrometry, including researching rocky exoplanets in the vicinity of the Sun and studying dark matter. The Habitable Worlds Observatory (HWO) is a promising candidate to carry an astrometric instrument because it provides a stable, space-based telescope with a large aperture, which allows faint sources and small displacements to be observed. This paper presents the characterization of an appropriate detector for an astrometric instrument: the 46Mpx Gigapyx from Pyxalis. Moreover it explains the implementation of a testbed enabling interferometric characterization of pixel positions. Finally, the paper introduces a method for calibrating the telescope's optical distortion. This method was implemented in simulation and tested thanks to an optical bench developed at IPAG in France. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_12270 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Experimental tests of the calibration of high precision differential astrometry for HWO Lizzana, Manon Malbet, Fabien Leger, Alain Pancher, Fabrice Soler, Sébastien Rousset, Hugo Lepine, Thierry Michelot, Julien Er-Rahmaouy, Yahya Bakka, Youssef Instrumentation and Methods for Astrophysics Earth and Planetary Astrophysics Many different scientific applications require sub-micro arcsecond precision astrometry, including researching rocky exoplanets in the vicinity of the Sun and studying dark matter. The Habitable Worlds Observatory (HWO) is a promising candidate to carry an astrometric instrument because it provides a stable, space-based telescope with a large aperture, which allows faint sources and small displacements to be observed. This paper presents the characterization of an appropriate detector for an astrometric instrument: the 46Mpx Gigapyx from Pyxalis. Moreover it explains the implementation of a testbed enabling interferometric characterization of pixel positions. Finally, the paper introduces a method for calibrating the telescope's optical distortion. This method was implemented in simulation and tested thanks to an optical bench developed at IPAG in France. |
| title | Experimental tests of the calibration of high precision differential astrometry for HWO |
| topic | Instrumentation and Methods for Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2510.12270 |