# Orbus-21

> American rocket stage

**Wikidata**: [Q106241796](https://www.wikidata.org/wiki/Q106241796)  
**Source**: https://4ort.xyz/entity/orbus-21


## References

1. [Source](http://www.astronautix.com/s/srm-1.html)
2. [Source](http://www.braeunig.us/space/specs/ius.htm)