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license: mit
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# MMT Snapshot
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Snapshot of MMT[^1] database from 17th of January 2025.
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## File structure
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- `rso.csv` - object information
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- `data/` - directory containing tracks measurements in `.parquet` files
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- `bulk_idx.txt` - contains the index of last bulk file downloaded from the MMT database
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## Object information
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- `mmt_id` - Identification number of the object in MMT database.
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- `norad_id` - Norad identification number of the object.
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- `name` - Name of the object.
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- `country` - Country of origin.
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- `variability` - Variability: "non-variable", "aperiodic", "periodic".
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## Tracks measurements
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Parquet files are structured with the following fields:
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- `id` - Identification number of the record.
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- `norad_id` - Norad identification number of the object.
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- `period` - Apparent rotational period in seconds.
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- `timestamp` - Start of the observation timestamp in the format '%Y-%m-%d %H:%M:%S'
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- `name` - Name of the object.
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- `variability` - Variability: 0 (nonvariable), 1 (aperiodic), 2 (periodic).
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- `time` - A list of observation times.
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- `mag` - A list of measured standardized magnitudes to 1000 km distance.
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- `phase` - A list of measured phase angles in degrees.
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- `distance` - A list of measured altitudes in km.
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- `filter` - A list of filters used: 0 (uknown), 1 (clear), 2 (pol), 4 (V), 8(R), 16(B).
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Tracks measurements are stored in `.csv` files with containing the following fields: time,stdMag,phase,distance,filter.
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---
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license: mit
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---
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# MMT Snapshot
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Snapshot of MMT[^1] database from 17th of January 2025.
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## File structure
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- `rso.csv` - object information
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- `data/` - directory containing tracks measurements in `.parquet` files
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- `bulk_idx.txt` - contains the index of last bulk file downloaded from the MMT database
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## Object information
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- `mmt_id` - Identification number of the object in MMT database.
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- `norad_id` - Norad identification number of the object.
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- `name` - Name of the object.
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- `country` - Country of origin.
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- `variability` - Variability: "non-variable", "aperiodic", "periodic".
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## Tracks measurements
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Parquet files are structured with the following fields:
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- `id` - Identification number of the record.
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- `norad_id` - Norad identification number of the object.
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- `period` - Apparent rotational period in seconds.
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- `timestamp` - Start of the observation timestamp in the format '%Y-%m-%d %H:%M:%S'
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- `name` - Name of the object.
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- `variability` - Variability: 0 (nonvariable), 1 (aperiodic), 2 (periodic).
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- `time` - A list of observation times.
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- `mag` - A list of measured standardized magnitudes to 1000 km distance.
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- `phase` - A list of measured phase angles in degrees.
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- `distance` - A list of measured altitudes in km.
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- `filter` - A list of filters used: 0 (uknown), 1 (clear), 2 (pol), 4 (V), 8(R), 16(B).
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Tracks measurements are stored in `.csv` files with containing the following fields: time,stdMag,phase,distance,filter.
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## 📝 Citing
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```bibtex
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@article{kyselica2025lcdc,
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title={LCDC: Bridging Science and Machine Learning for Light Curve Analysis},
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author={Kyselica, Daniel and Hrob{\'a}r, Tom{\'a}{\v{s}} and {\v{S}}ilha, Ji{\v{r}}{\'\i} and {\v{D}}urikovi{\v{c}}, Roman and {\v{S}}uppa, Marek},
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journal={arXiv preprint arXiv:2504.10550},
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year={2025}
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}
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```
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---
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[^1]: Karpov, S., et al. "Mini-Mega-TORTORA wide-field monitoring system with sub-second temporal resolution: first year of operation." Revista Mexicana de Astronomía y Astrofísica 48 (2016): 91-96.
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