Update constellation catalog: 94 constellations

README.md

@@ -0,0 +1,128 @@
+---
+license: cc0-1.0
+pretty_name: "Constellation Catalog"
+language:
+  - en
+description: >-
+  All 94 IAU-recognized constellations sourced from Wikidata, with IAU
+  abbreviations, area in square degrees, sky coordinates, brightest star,
+  and mythological origin.
+size_categories:
+  - n<1K
+task_categories:
+  - tabular-classification
+tags:
+  - space
+  - astronomy
+  - constellations
+  - wikidata
+  - open-data
+  - tabular-data
+  - parquet
+configs:
+  - config_name: default
+    default: true
+    data_files:
+      - split: train
+        path: data/constellations.parquet
+---
+
+# Constellation Catalog
+
+*Part of the [Astronomy Datasets](https://huggingface.co/collections/juliensimon/astronomy-datasets-69c24caf2f17e36128946743) collection on Hugging Face.*
+
+Complete catalog of all **94** IAU-recognized constellations, sourced from [Wikidata](https://www.wikidata.org/).
+
+## Dataset description
+
+The International Astronomical Union (IAU) officially recognizes 88 constellations that together tile the entire celestial sphere. These range from ancient Greek figures catalogued by Ptolemy in the Almagest to southern-hemisphere constellations added by European explorers in the 16th–18th centuries and formalized by Eugène Delporte in 1930.
+
+This dataset records each constellation with its IAU three-letter abbreviation, the area it covers in square degrees, the coordinates of its center (right ascension and declination), its brightest star, and the mythological figure or object it was named after. This enables sky-coverage analysis, educational tools, and cross-referencing with star and deep-sky-object catalogs.
+
+Sourced from Wikidata's structured knowledge base (property P31=Q8928 for instance-of:constellation), maintained by the astronomy community.
+
+## Schema
+
+| Column | Type | Description |
+|--------|------|-------------|
+| `wikidata_id` | string | Wikidata entity ID (e.g. Q8928) |
+| `name` | string | Full English name of the constellation |
+| `iau_abbreviation` | string | IAU three-letter abbreviation (e.g. Ori, UMa) |
+| `symbol` | string | Traditional symbol or figure |
+| `brightest_star` | string | Common name of the brightest star |
+| `area_sq_deg` | float | Area of the constellation in square degrees |
+| `ra_center` | float | Right ascension of center (degrees) |
+| `dec_center` | float | Declination of center (degrees) |
+| `named_after` | string | Mythological figure, animal, or object it represents |
+
+## Quick stats
+
+- **94** IAU-recognized constellations
+- **86** with area in square degrees (total sky: ~40,337 sq deg)
+- **2** with sky coordinates (RA/Dec center)
+- **0** with brightest star identified
+- **75** with named-after mythology or origin
+
+## Usage
+
+```python
+from datasets import load_dataset
+
+ds = load_dataset("juliensimon/constellation-catalog", split="train")
+df = ds.to_pandas()
+
+# Largest constellations by area
+print(df.nlargest(10, "area_sq_deg")[["name", "iau_abbreviation", "area_sq_deg"]])
+
+# Constellations named after mythological figures
+myth = df[df["named_after"].notna()]
+print(myth[["name", "named_after"]].head(10))
+
+# Northern sky constellations (positive declination)
+northern = df[df["dec_center"] > 0]
+print(f"{len(northern)} northern-hemisphere constellations")
+
+# Find by IAU abbreviation
+orion = df[df["iau_abbreviation"] == "Ori"].iloc[0]
+print(f"Orion: {orion['area_sq_deg']:.0f} sq deg, brightest star: {orion['brightest_star']}")
+```
+
+## Data source
+
+[Wikidata](https://www.wikidata.org/) SPARQL endpoint. Constellations identified via
+property P31 (instance of) = Q8928 (constellation). IAU formalization by Eugène Delporte (1930).
+
+## Update schedule
+
+Quarterly (January, April, July, October). Re-run manually to pick up Wikidata improvements.
+
+## Related datasets
+
+- [astronomer-database](https://huggingface.co/datasets/juliensimon/astronomer-database) -- Astronomer biographies
+- [observatory-database](https://huggingface.co/datasets/juliensimon/observatory-database) -- Astronomical observatories
+- [bright-star-catalog](https://huggingface.co/datasets/juliensimon/bright-star-catalog) -- Yale Bright Star Catalog
+
+## Pipeline
+
+Source code: [juliensimon/space-datasets](https://github.com/juliensimon/space-datasets)
+
+## Support
+
+If you find this dataset useful, please give it a ❤️ on the [dataset page](https://huggingface.co/datasets/juliensimon/constellation-catalog) and share feedback in the Community tab! Also consider giving a ⭐️ to the [space-datasets](https://github.com/juliensimon/space-datasets) repo.
+
+## Citation
+
+```bibtex
+@dataset{constellation_catalog,
+  author = {Simon, Julien},
+  title = {Constellation Catalog},
+  year = {2026},
+  publisher = {Hugging Face},
+  url = {https://huggingface.co/datasets/juliensimon/constellation-catalog},
+  note = {Sourced from Wikidata (CC0)}
+}
+```
+
+## License
+
+[CC0-1.0](https://creativecommons.org/publicdomain/zero/1.0/) (Wikidata content is public domain)

data/constellations.parquet

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2074fe22232f92f0b0d521dc15e16d768f6d39a46b0ebb519d3c9b21b7df3355
+size 9437