Update cataclysmic variable catalog: 1,168 CVs

README.md

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+---
+license: cc-by-4.0
+pretty_name: "Ritter & Kolb Cataclysmic Variable Catalog"
+language:
+  - en
+description: "Catalog of cataclysmic variables (CVs) from the Ritter & Kolb catalog — white dwarfs accreting from companion stars"
+task_categories:
+  - tabular-classification
+tags:
+  - space
+  - cataclysmic-variable
+  - white-dwarf
+  - nova
+  - dwarf-nova
+  - binary-star
+  - astronomy
+  - accretion
+  - open-data
+  - tabular-data
+  - parquet
+size_categories:
+  - 1K<n<10K
+configs:
+  - config_name: default
+    data_files:
+      - split: train
+        path: data/cataclysmic_variables.parquet
+    default: true
+---
+
+# Ritter & Kolb Cataclysmic Variable Catalog
+
+*Part of the [Astronomy Datasets](https://huggingface.co/collections/juliensimon/astronomy-datasets-69c24caf2f17e36128946743) and [Variable Stars & Transients](https://huggingface.co/collections/juliensimon/variable-stars-transients-69c24caf2f17e36128946744) collections on Hugging Face.*
+
+![Update Cataclysmic Variables](https://github.com/juliensimon/space-datasets/actions/workflows/update-cataclysmic-variables.yml/badge.svg)
+![Updated](https://img.shields.io/badge/dynamic/json?url=https://raw.githubusercontent.com/juliensimon/space-datasets/main/status.json&query=$.cataclysmic-variables&label=updated&color=brightgreen)
+
+The Ritter & Kolb catalog of cataclysmic variables (CVs), sourced from NASA HEASARC.
+Currently **1,168** CVs with 63 attributes.
+
+## Dataset description
+
+Cataclysmic variables (CVs) are binary star systems in which a white dwarf accretes
+matter from a low-mass companion star (typically a red dwarf) that overflows its Roche
+lobe. The infalling material forms an accretion disk around the white dwarf, producing
+dramatic brightness variations across timescales from seconds to decades. CVs are
+classified into several subtypes based on their outburst behavior and magnetic field
+strength:
+
+- **Dwarf novae** (DN): exhibit quasi-periodic outbursts of 2-8 magnitudes caused by
+  thermal instabilities in the accretion disk. Includes SU UMa, U Gem, and Z Cam subtypes.
+- **Classical novae** (N): undergo thermonuclear explosions on the white dwarf surface
+  when accreted hydrogen reaches a critical mass, brightening by 6-19 magnitudes.
+- **Polars** (AM Her): strongly magnetic white dwarfs (B ~ 10-230 MG) where the magnetic
+  field channels accretion directly onto the poles, preventing disk formation.
+- **Intermediate polars** (DQ Her): moderately magnetic white dwarfs (B ~ 1-10 MG)
+  with a truncated accretion disk and magnetically channeled inner flow.
+- **Nova-like variables** (NL): high mass-transfer rate systems in a persistent
+  bright state without the outburst cycles of dwarf novae.
+
+The Ritter & Kolb catalog is the standard reference catalog for CV research, containing
+orbital periods, spectral types, magnitudes, and classifications for the known CV
+population. This dataset is essential for population studies, period distribution
+analysis, and understanding the evolution of compact binary systems.
+
+## Schema
+
+| Column | Type |
+|--------|------|
+| `__row` | object |
+| `name` | object |
+| `alt_name` | object |
+| `ra` | float64 |
+| `dec` | float64 |
+| `lii` | float64 |
+| `bii` | float64 |
+| `acc_pos` | object |
+| `type1` | object |
+| `type1_flag` | object |
+| `type2` | object |
+| `type2_flag` | object |
+| `type3` | object |
+| `type3_flag` | object |
+| `type4` | object |
+| `type4_flag` | object |
+| `lim_mag1` | float64 |
+| `mag1` | float64 |
+| `mag1_flag` | float64 |
+| `lim_mag2` | float64 |
+| `mag2` | float64 |
+| `mag2_flag` | float64 |
+| `lim_mag3` | float64 |
+| `mag3` | float64 |
+| `mag3_flag` | float64 |
+| `lim_mag4` | float64 |
+| `mag4` | float64 |
+| `mag4_flag` | float64 |
+| `interval` | object |
+| `interval2` | object |
+| `orbital_period` | float64 |
+| `orbital_period_flag` | float64 |
+| `period2` | float64 |
+| `period2_flag` | float64 |
+| `period3` | float64 |
+| `period3_flag` | float64 |
+| `period4` | float64 |
+| `period4_flag` | float64 |
+| `eclipse` | object |
+| `sb` | object |
+| `spect_type_2` | object |
+| `spect_type_1` | object |
+| `lim_mass_ratio` | object |
+| `mass_ratio` | object |
+| `mass_ratio_flag` | object |
+| `mass_ratio_error` | object |
+| `lim_inclination` | object |
+| `inclination` | object |
+| `inclination_flag` | object |
+| `inclination_error` | object |
+| `lim_m1` | object |
+| `m1` | object |
+| `m1_flag` | object |
+| `m1_error` | object |
+| `lim_m2` | object |
+| `m2` | object |
+| `m2_flag` | object |
+| `m2_error` | object |
+| `class` | object |
+| `__x_ra_dec` | object |
+| `__y_ra_dec` | object |
+| `__z_ra_dec` | object |
+| `cv_subtype` | object |
+
+## Quick stats
+
+- **1,168** cataclysmic variables
+- **0** systems with measured orbital period
+- CV subtypes:
+  - **other**: 1,166
+
+## Usage
+
+```python
+from datasets import load_dataset
+
+ds = load_dataset("juliensimon/cataclysmic-variable-catalog", split="train")
+df = ds.to_pandas()
+
+# Filter by CV subtype
+dwarf_novae = df[df['cv_subtype'] == 'dwarf_nova']
+polars = df[df['cv_subtype'] == 'polar']
+
+# Period distribution
+# No period column available
+
+# Sky distribution
+import matplotlib.pyplot as plt
+import numpy as np
+fig, ax = plt.subplots(subplot_kw={"projection": "aitoff"})
+ra = np.radians(df["ra"].values - 180) if "ra" in df.columns else []
+dec = np.radians(df["dec"].values) if "dec" in df.columns else []
+ax.scatter(ra, dec, s=1, alpha=0.5)
+plt.title("Cataclysmic Variables - Sky Distribution")
+```
+
+## Data source
+
+All data comes from the [Ritter & Kolb Cataclysmic Binaries catalog](https://heasarc.gsfc.nasa.gov/W3Browse/all/rittercv.html)
+hosted by NASA's High Energy Astrophysics Science Archive Research Center (HEASARC),
+accessed via the TAP protocol. Originally published in:
+Ritter H., Kolb U., 2003, A&A 404, 301 (Edition 7.24).
+
+## Update schedule
+
+Quarterly (Feb/May/Aug/Nov 1st at 08:30 UTC) via [GitHub Actions](https://github.com/juliensimon/space-datasets).
+
+## Related datasets
+
+- [xray-binary-catalog](https://huggingface.co/datasets/juliensimon/xray-binary-catalog) — X-ray binary systems
+- [gaia-dr3-white-dwarfs](https://huggingface.co/datasets/juliensimon/gaia-dr3-white-dwarfs) — Gaia white dwarf catalog
+- [gcvs-variable-stars](https://huggingface.co/datasets/juliensimon/gcvs-variable-stars) — General Catalogue of Variable Stars
+- [kepler-eclipsing-binaries](https://huggingface.co/datasets/juliensimon/kepler-eclipsing-binaries) — Kepler eclipsing binary catalog
+
+## Pipeline
+
+Source code: [juliensimon/space-datasets](https://github.com/juliensimon/space-datasets)
+
+## Support
+
+If you find this dataset useful, please give it a heart on the [dataset page](https://huggingface.co/datasets/juliensimon/cataclysmic-variable-catalog) and share feedback in the Community tab! Also consider giving a star to the [space-datasets](https://github.com/juliensimon/space-datasets) repo.
+
+## Citation
+
+```bibtex
+@dataset{cataclysmic_variable_catalog,
+  author = {Simon, Julien},
+  title = {Ritter & Kolb Cataclysmic Variable Catalog},
+  year = {2026},
+  publisher = {Hugging Face},
+  url = {https://huggingface.co/datasets/juliensimon/cataclysmic-variable-catalog},
+  note = {Based on Ritter & Kolb (2003) catalog, sourced from NASA HEASARC}
+}
+```
+
+## License
+
+[CC-BY-4.0](https://creativecommons.org/licenses/by/4.0/)

data/cataclysmic_variables.parquet

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