# Q94823990
**Wikidata**: [Q94823990](https://www.wikidata.org/wiki/Q94823990)  
**Source**: https://4ort.xyz/entity/q94823990


## References

1. SIMBAD
2. The mass of the neutron star in Cygnus X-2 (V1341 cygni)
3. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
4. Fourth USNO CCD Astrograph Catalog
5. A catalogue of low-mass X-ray binaries in the Galaxy, LMC, and SMC (Fourth edition)
6. Gaia Data Release 2
7. Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Radial velocities: The Wilson-Evans-Batten catalogue
8. The distances to Galactic low-mass X-ray binaries: consequences for black hole luminosities and kicks