# V404 Cygni

> binary star

**Wikidata**: [Q1635586](https://www.wikidata.org/wiki/Q1635586)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/V404_Cygni)  
**Source**: https://4ort.xyz/entity/v404-cygni


## References

1. SIMBAD
2. Optical studies of V404 Cyg, the X-ray transient GS 2023+338 - III. The secondary star and accretion disc
3. Freebase Data Dumps. 2013
4. General Catalogue of Variable Stars, 3rd ed.
5. A catalogue of low-mass X-ray binaries in the Galaxy, LMC, and SMC (Fourth edition)
6. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
7. Gaia Data Release 2
8. The first accurate parallax distance to a black hole