Upload SsODNet asteroid properties: 1,487,300 objects

README.md

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+---
+license: cc-by-4.0
+pretty_name: "SsODNet Asteroid Physical Properties"
+language:
+  - en
+description: "Physical and orbital properties for 1,487,300 asteroids from IMCCE SsODNet — diameters, albedos, taxonomy, masses, densities, and rotation periods compiled from published literature."
+task_categories:
+  - tabular-classification
+  - tabular-regression
+tags:
+  - space
+  - asteroids
+  - physical-properties
+  - imcce
+  - orbital-mechanics
+  - open-data
+  - tabular-data
+size_categories:
+  - 1M<n<10M
+configs:
+  - config_name: default
+    data_files:
+      - split: train
+        path: data/ssodnet_asteroid_properties.parquet
+    default: true
+---
+
+# SsODNet Asteroid Physical Properties
+
+*Part of the [Orbital Mechanics Datasets](https://huggingface.co/collections/juliensimon/orbital-mechanics-datasets-69c24caca4ab3934c9856994) collection on Hugging Face.*
+
+Physical and dynamical properties of **1,487,300** asteroids and dwarf planets from the
+IMCCE (Paris Observatory) Solar System Open Database Network (SsODNet). This is the most
+comprehensive asteroid characterization catalog available, compiling best estimates from
+thousands of published studies.
+
+## Dataset description
+
+SsODNet aggregates physical property measurements from the astronomical literature into
+a single, curated "best estimates" flat table (ssoBFT). For each asteroid, IMCCE selects
+the most reliable published value for each property using a transparent ranking scheme.
+Properties include diameters, albedos, taxonomic classifications, masses, densities,
+rotation periods, and thermal inertia — alongside orbital elements and dynamical family
+memberships.
+
+The fill factor varies by property: orbital elements are available for nearly all objects,
+while physical measurements like mass (429 objects) and density
+(468 objects) are known for far fewer.
+
+## Schema
+
+| Column | Type | Description |
+|--------|------|-------------|
+| `sso_id` | string | SsODNet unique identifier |
+| `sso_number` | Int64 | IAU asteroid catalog number (null for unnumbered) |
+| `sso_name` | string | IAU name (null if unnamed) |
+| `sso_type` | string | Object type (Asteroid, Dwarf Planet, etc.) |
+| `sso_class` | string | Dynamical class (MB, NEA, Trojan, Centaur, KBO, etc.) |
+| `semi_major_axis_au` | float64 | Orbital semi-major axis (AU) |
+| `eccentricity` | float64 | Orbital eccentricity |
+| `inclination_deg` | float64 | Orbital inclination (degrees) |
+| `orbital_period_yr` | float64 | Orbital period (years) |
+| `periapsis_distance_au` | float64 | Perihelion distance (AU) |
+| `apoapsis_distance_au` | float64 | Aphelion distance (AU) |
+| `tisserand_jupiter` | float64 | Tisserand parameter w.r.t. Jupiter |
+| `family_number` | Int64 | Dynamical family number |
+| `family_name` | string | Dynamical family name |
+| `family_status` | string | Family membership status |
+| `absolute_magnitude` | float64 | Absolute magnitude H (best estimate) |
+| `absolute_magnitude_err_min` | float64 | H magnitude lower error bound |
+| `absolute_magnitude_err_max` | float64 | H magnitude upper error bound |
+| `diameter_km` | float64 | Effective diameter (km, best estimate) |
+| `diameter_err_min_km` | float64 | Diameter lower error bound (km) |
+| `diameter_err_max_km` | float64 | Diameter upper error bound (km) |
+| `albedo` | float64 | Geometric albedo (best estimate) |
+| `albedo_err_min` | float64 | Albedo lower error bound |
+| `albedo_err_max` | float64 | Albedo upper error bound |
+| `mass_kg` | float64 | Mass (kg, best estimate) |
+| `mass_err_min_kg` | float64 | Mass lower error bound (kg) |
+| `mass_err_max_kg` | float64 | Mass upper error bound (kg) |
+| `density_g_cm3` | float64 | Bulk density (g/cm3, best estimate) |
+| `density_err_min_g_cm3` | float64 | Density lower error bound (g/cm3) |
+| `density_err_max_g_cm3` | float64 | Density upper error bound (g/cm3) |
+| `taxonomy_class` | string | Taxonomic class (e.g., S, C, X, V) |
+| `taxonomy_complex` | string | Taxonomic complex (e.g., S-complex, C-complex) |
+| `taxonomy_scheme` | string | Classification scheme (Bus-DeMeo, Tholen, etc.) |
+| `taxonomy_waverange` | string | Wavelength range used for classification |
+| `taxonomy_technique` | string | Technique used for classification |
+| `thermal_inertia` | float64 | Thermal inertia (J m-2 s-0.5 K-1) |
+| `thermal_inertia_err_min` | float64 | Thermal inertia lower error bound |
+| `thermal_inertia_err_max` | float64 | Thermal inertia upper error bound |
+| `rotation_period_h` | float64 | Rotation period (hours, best estimate) |
+| `rotation_period_err_min_h` | float64 | Rotation period lower error bound (hours) |
+| `rotation_period_err_max_h` | float64 | Rotation period upper error bound (hours) |
+| `moid_earth_au` | float64 | Minimum orbit intersection distance with Earth (AU) |
+
+## Quick stats
+
+- **1,487,300** asteroids and dwarf planets
+- **149,496** with measured diameter
+- **149,497** with measured albedo
+- **170,933** with taxonomic classification
+- **429** with mass estimate
+- **468** with density estimate
+- **51,005** with rotation period
+- **255,987** with dynamical family assignment
+
+## Usage
+
+```python
+from datasets import load_dataset
+
+ds = load_dataset("juliensimon/ssodnet-asteroid-properties", split="train")
+df = ds.to_pandas()
+
+# Taxonomy distribution
+df["taxonomy_class"].value_counts().head(10)
+
+# Large asteroids with known density
+dense = df[df["density_g_cm3"].notna() & (df["diameter_km"] > 100)]
+dense[["sso_name", "diameter_km", "density_g_cm3", "taxonomy_class"]].sort_values(
+    "diameter_km", ascending=False
+)
+
+# Near-Earth asteroids sorted by MOID
+neas = df[df["sso_class"] == "NEA"].sort_values("moid_earth_au")
+neas[["sso_name", "diameter_km", "moid_earth_au", "albedo"]].head(20)
+
+# Diameter vs albedo by taxonomy
+import matplotlib.pyplot as plt
+sample = df.dropna(subset=["diameter_km", "albedo", "taxonomy_complex"])
+for cpx, grp in sample.groupby("taxonomy_complex"):
+    plt.scatter(grp["diameter_km"], grp["albedo"], s=1, alpha=0.4, label=cpx)
+plt.xscale("log")
+plt.xlabel("Diameter (km)")
+plt.ylabel("Albedo")
+plt.legend(fontsize=7)
+```
+
+## Data source
+
+[IMCCE SsODNet — Solar System Open Database Network](https://ssp.imcce.fr/webservices/ssodnet/)
+
+The ssoBFT (Best Flat Table) compiles best estimates of physical and dynamical properties
+for all known asteroids and dwarf planets. Data originates from thousands of peer-reviewed
+publications, curated by IMCCE (Paris Observatory). See Berthier et al. (2023),
+"SsODNet: The Solar System Open Database Network",
+[A&A 671, A151](https://doi.org/10.1051/0004-6361/202244878).
+
+## Pipeline
+
+Source code: [juliensimon/space-datasets](https://github.com/juliensimon/space-datasets)
+
+## Citation
+
+```bibtex
+@dataset{ssodnet_asteroid_properties,
+  author = {Simon, Julien},
+  title = {SsODNet Asteroid Physical Properties},
+  year = {2026},
+  publisher = {Hugging Face},
+  url = {https://huggingface.co/datasets/juliensimon/ssodnet-asteroid-properties},
+  note = {Based on IMCCE SsODNet ssoBFT, Berthier et al. (2023)}
+}
+```
+
+## License
+
+[CC-BY-4.0](https://creativecommons.org/licenses/by/4.0/)

data/ssodnet_asteroid_properties.parquet

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