# Atlas V 521

> United Launch Alliance launch vehicle

**Wikidata**: [Q20803912](https://www.wikidata.org/wiki/Q20803912)  
**Source**: https://4ort.xyz/entity/atlas-v-521

## Summary
Atlas V 521 is a rocket-model variant of the Atlas V family and a United Launch Alliance (ULA) launch vehicle. It is classified as a configuration within the Atlas V American expendable launch system and is associated with satellites such as EchoStar XII and AMC-16.

## Key Facts
- Atlas V 521 is an instance of a rocket model.  
- Atlas V 521 is a subclass/variant of the Atlas V family.  
- Atlas V (the parent class) is an American expendable launch system.  
- Atlas V 521 is described on Wikidata as a United Launch Alliance launch vehicle.  
- The Atlas V parent class has a sitelink_count of 44.  
- The Atlas V 521 entry has a sitelink_count of 2.  
- Commons category for media is titled "Atlas V 521".  
- Wikipedia-related language entries for Atlas V 521 include "commons" and "lv".  
- Related satellites listed are EchoStar XII (a retired geostationary communications satellite, United States) and AMC-16 (an American satellite).

## FAQs
### Q: What is Atlas V 521?
A: Atlas V 521 is a rocket-model variant of the Atlas V family and a United Launch Alliance launch vehicle. It is a configuration within the Atlas V expendable launch system.

### Q: Who is associated with Atlas V 521?
A: Atlas V 521 is associated with United Launch Alliance as its launch-vehicle family. The Atlas V parent class is characterized as an American expendable launch system.

### Q: Which satellites are linked to Atlas V 521?
A: Satellites noted as related to Atlas V 521 include EchoStar XII (a retired geostationary communications satellite from the United States) and AMC-16 (an American satellite).

### Q: Where can I find media or documentation for Atlas V 521?
A: Media is categorized under the Wikimedia Commons category "Atlas V 521". The Atlas V 521 entry has two sitelinks and appears in Wikimedia language entries "commons" and "lv".

## Why It Matters
Atlas V 521 is significant because it is a named configuration within the Atlas V family, a widely recognized American expendable launch system used for orbital missions. As a ULA launch-vehicle variant, Atlas V 521 forms part of the portfolio of rockets that provide launch options for payloads such as communications satellites. Its association with payloads like EchoStar XII (a retired geostationary communications satellite) and AMC-16 indicates its relevance to commercial and operational satellite deployment. The existence of a dedicated Commons category and multiple sitelinks reflects documented recognition and public interest. For researchers, operators, and satellite customers, knowing specific Atlas V configurations like the 521 variant helps identify the capabilities and historical record of the Atlas V family within ULA’s launch offerings.

## Notable For
- Being a defined rocket-model variant (subclass) within the Atlas V family.  
- Being described explicitly as a United Launch Alliance launch vehicle.  
- Having documented associations with communication satellites such as EchoStar XII and AMC-16.  
- Having a dedicated Wikimedia Commons category titled "Atlas V 521".  
- Having presence in Wikimedia entries (sitelink_count = 2) and language listings ("commons", "lv").

## Body
### Identity
- Name: Atlas V 521.  
- Instance_of: rocket model.  
- Wikidata description: United Launch Alliance launch vehicle.

### Classification and Parentage
- Subclass_of: Atlas V (the Atlas V family).  
- Atlas V (parent class) description: American expendable launch system.  
- Atlas V (parent) sitelink_count: 44.

### Associations and Related Payloads
- Related Thing: EchoStar XII — described as a retired geostationary communications satellite; country: United States (reference provided in source).  
- Related Thing: AMC-16 — described as an American satellite.  
- The relationship in source material is listed as "related" (the source does not specify launch dates or which missions used the Atlas V 521 configuration).

### Wikimedia and Reference Metadata
- sitelink_count (Atlas V 521): 2.  
- commons_category: Atlas V 521.  
- wikipedia_languages listed for the Atlas V 521 entry: commons, lv.

### Notes and Source Scope
- All statements in this entry are drawn from the provided source material.  
- The source lists classification, related satellites, Wikimedia metadata, and the parent Atlas V class description.  
- The source does not provide technical performance specifications, launch dates, or mission counts for Atlas V 521.