# U Cygni

> variable star in the constellation Cyfnus

**Wikidata**: [Q12777961](https://www.wikidata.org/wiki/Q12777961)  
**Source**: https://4ort.xyz/entity/u-cygni


## References

1. SIMBAD
2. General Catalogue of Variable Stars
3. Circumstellar envelopes and the evolution of carbon stars
4. General Catalogue of Variable Stars, 3rd ed.
5. The ASAS-SN Catalog of Variable Stars II: Uniform Classification of 412,000 Known Variables
6. Long-period High-amplitude Red Variables in the KELT Survey
7. Catalogue of Stellar Photometry in Johnson's 11-color system
8. Gaia Early Data Release 3
9. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system
10. A catalogue of stellar rotational velocities
11. Gaia Data Release 2