# Q66491774

> astrophysical X-ray source in the constellation Cassiopeia

**Wikidata**: [Q66491774](https://www.wikidata.org/wiki/Q66491774)  
**Source**: https://4ort.xyz/entity/q66491774


## References

1. SIMBAD
2. VizieR Online Data Catalog: Henry Draper Catalogue and Extension, published in Ann. Harvard Obs. 91-100 (1918-1925)
3. The Tycho-2 catalogue of the 2.5 million brightest stars
4. Gaia Data Release 2
5. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
6. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system
7. Validation of the new Hipparcos reduction
8. ROSAT All-Sky Survey Faint Source Catalogue
9. New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s)