Ohsawa, Ryou; Kawata, Daisuke; Kamizuka, Takafumi; Yamada, Yoshiyuki; Löffler, Wolfgang; Biermann, Michael; (2024) Concept verification of the JASMINE astrometric plate analysis. In: Ibsen, Jorge and Chiozzi, Gianluca, (eds.) Software and Cyberinfrastructure for Astronomy VIII. (pp. 131011R). SPIE: Bellingham, WA, USA.

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Abstract

The Japan Astrometry Satellite Mission for Infrared Exploration (JASMINE) aims at high-precision astrometry in the near-infrared wavelengths (1.0–1.6 μm). This mission focuses on the Galactic center region, obscured by interstellar dust in optical wavelengths. JASMINE’s observation strategy differs from other missions and must be verified via dedicated simulations. To verify the mission concept, we designed a simplified simulation, the JASMINE mini survey, covering three years with 100 orbits. As a simple case, the data obtained in a single satellite orbit are analyzed simultaneously (Plate Analysis). The observation model was made differentiable and implemented as a probabilistic model to make the best use of Stochastic Variational Inference. Model parameters converged to a certain solution, while the observation model contained more than 30,000 parameters. The estimated coordinates well represented the stellar motions expected from the ground truth. A typical positional error was estimated to be about 70 µas, consistent with the measurement error and the number of measurements. The present results validate parts of JASMINE’s mission concepts, leading to significant advancements in understanding the Galactic center.

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