# Psi Cygni

> star system in the constellation Cygnus

**Wikidata**: [Q5098553](https://www.wikidata.org/wiki/Q5098553)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Psi_Cygni)  
**Source**: https://4ort.xyz/entity/psi-cygni


## References

1. The Updated Multiple Star Catalog
2. VizieR
3. MK classification for visual binary components
4. Axial rotation and stellar evolution
5. The spectra and rotational velocities of the bright stars of Draper types A3-G0
6. Washington Double Star Catalog
7. SIMBAD
8. Freebase Data Dumps. 2013
9. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
10. The Tycho double star catalogue
11. Validation of the new Hipparcos reduction
12. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system
13. Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i
14. Rotational velocities of A-type stars. III. Velocity distributions
15. Rotational velocities of A-type stars. IV. Evolution of rotational velocities