# Q66634838

> astrophysical X-ray source in the constellation Hydra

**Wikidata**: [Q66634838](https://www.wikidata.org/wiki/Q66634838)  
**Source**: https://4ort.xyz/entity/q66634838


## References

1. SIMBAD
2. Source
3. The Tycho-2 catalogue of the 2.5 million brightest stars
4. Third U.S. Naval Observatory CCD Astrograph Catalog (UCAC3)
5. The DENIS database, 3rd Release
6. Gaia Data Release 2
7. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
8. The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs in wide orbits
9. ROSAT All-Sky Survey Faint Source Catalogue
10. New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s)