Raw movie data, reduced light curves, and model profiles for the 2024-01-10 occultation by (612533) 2002 XV93

This package accompanies the manuscript:Arimatsu, K., et al., “Detection of an atmosphere on a trans-Neptunian object beyond Pluto”, Nature Astronomy, accepted, DOI: 10.1038/s41550-026-02846-1.

It contains three data directories that support the key observational and modelling results in the paper: (i) raw time-series imaging/video data, (ii) reduced and normalized occultation light curves, and (iii) best-fit synthetic refraction/occultation profiles plotted in Fig. 3 and Extended Data Fig. 3.

## Directory structuremovie_data/(raw movies and image cubes)README.mdlightcurve_data/(reduced, normalized light-curve CSV files)README.mdmodel_profiles/(best-fit synthetic profiles used in Fig. 3 and Extended Data Fig. 3)README.md

Each subdirectory contains its own `README.md` describing file formats, column definitions, timing conventions, and any station/instrument-specific notes required for correct interpretation.

## Summary of contents

`movie_data/` provides the original time-series data acquired at the three stations used in the analysis (Kyoto, Kiso, Fukushima). File formats differ by site/instrument (e.g., SER, 3D FITS cubes, AVI), and the applicable timing convention is instrument-dependent. Users who work directly from raw frames should read `movie_data/README.md` first.

`lightcurve_data/` provides the reduced, normalized light curves as CSV files with time stamps (MJD) and per-point uncertainties. These files are the intended inputs for quantitative reproduction of the paper’s fitting results, χ² evaluations, and derived atmospheric constraints. Column definitions and basic ranges/cadences are documented in `lightcurve_data/README.md`.

`model_profiles/` provides the best-fit synthetic profiles (normalized intensity as a function of projected distance to the body centre) for each composition case and assumed bulk density, corresponding to the solid curves shown in Fig. 3 and the systematic-density comparison in Extended Data Fig. 3. File naming and column definitions are documented in `model_profiles/README.md`.

## Conventions and reproducibility notes

Times are expressed in UTC, either explicitly or via MJD(UTC) in the reduced light-curve products. Because raw instruments can define reference times differently (for example, pixel-row–dependent timing in rolling readout, or PPS-based overlay corrections), users should not combine raw timestamps across stations without applying the station-specific conventions described in `movie_data/README.md`.

The reduced CSV light curves and the tabulated best-fit model profiles are provided so that the primary results can be reproduced without reprocessing raw movies, while still allowing full reanalysis from the raw data when needed.

## How to cite

Please cite both the associated manuscript (when available) and this Zenodo record.Arimatsu, K., et al., “Detection of an atmosphere on a trans-Neptunian object beyond Pluto”, Nature Astronomy, accepted, DOI: 10.1038/s41550-026-02846-1.

## Contact

Questions about these data products should be directed to the corresponding author:Ko Arimatsu ([e-mail])