# PSR B1957+20 b

> star in the constellation Sagitta

**Wikidata**: [Q23407683](https://www.wikidata.org/wiki/Q23407683)  
**Source**: https://4ort.xyz/entity/psr-b1957-20-b


## References

1. Extrasolar Planets Encyclopaedia
2. Spectroscopy of the companion and bow-shock nebula of PSR 1957+20
3. SIMBAD
4. An Optical Study of the Black Widow Population
5. Inferring the composition of super-Jupiter mass companions of pulsars with radio line spectroscopy
6. Gaia Early Data Release 3