# Inmarsat-4 F3

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**Wikidata**: [Q6035073](https://www.wikidata.org/wiki/Q6035073)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Inmarsat-4_F3)  
**Source**: https://4ort.xyz/entity/inmarsat-4-f3

## Summary  
Inmarsat-4 F3 is a communications satellite operated by Inmarsat, launched into geostationary orbit on August 18, 2008. It was deployed using a Proton-M launch vehicle with a Briz-M upper stage from the Baikonur Cosmodrome. The satellite supports global mobile communication services.

## Key Facts  
- COSPAR ID: 2008-039A  
- Launch date: August 18, 2008  
- Operator: Inmarsat  
- Launch site: Baikonur Cosmodrome Site 200  
- Launch vehicle: Proton-M with Briz-M upper stage  
- Satellite class: Communications satellite  
- Orbit type: Geostationary orbit  
- Aliases: Inmarsat 4-F3  

## FAQs  
### Q: What is Inmarsat-4 F3 used for?  
A: Inmarsat-4 F3 is a communications satellite designed to support global mobile communication services, including voice and data transmission across maritime, aviation, and terrestrial users.

### Q: When was Inmarsat-4 F3 launched?  
A: Inmarsat-4 F3 was launched on August 18, 2008.

### Q: Which rocket was used to launch Inmarsat-4 F3?  
A: The satellite was launched using a Proton-M rocket with a Briz-M upper stage from the Baikonur Cosmodrome in Kazakhstan.

## Why It Matters  
Inmarsat-4 F3 plays a critical role in enabling reliable global communications, particularly in remote and underserved regions where terrestrial infrastructure is limited or unavailable. As part of Inmarsat's fourth-generation constellation, it enhances connectivity for aviation, maritime, and emergency response sectors. Its placement in geostationary orbit ensures continuous coverage over specific areas, contributing to the stability and reach of international telecommunication networks.

## Notable For  
- Part of Inmarsat’s advanced fourth-generation satellite constellation  
- Supports broadband global area network (BGAN) services  
- Operates in a high-value geostationary orbital slot  
- Launched via one of the most reliable heavy-lift vehicles, Proton-M  
- Enhances global resilience in mobile satellite communications  

## Body  
### Mission Overview  
Inmarsat-4 F3 is a key component of Inmarsat's fourth-generation satellite system, aimed at delivering enhanced mobile communication capabilities worldwide. It provides services such as broadband internet access, voice calls, and data transfer to users in aviation, maritime, government, and enterprise sectors.

### Technical Specifications  
As a modern geostationary communications satellite, Inmarsat-4 F3 operates in the L-band spectrum to ensure signal penetration through adverse weather conditions and physical obstructions. It complements other satellites in the I-4 series to offer seamless global coverage.

### Launch Details  
The satellite was successfully launched on August 18, 2008, utilizing a **Proton-M** launch vehicle augmented by a **Briz-M** upper stage. Liftoff occurred from **Baikonur Cosmodrome Site 200**, a historically significant launch complex used for many major space missions.

### Operational Role  
Once stationed in geostationary orbit, Inmarsat-4 F3 began providing uninterrupted communication services, supporting applications ranging from commercial aviation tracking to humanitarian aid coordination. Its position allows it to maintain constant visibility over assigned geographic regions.

### Legacy and Impact  
Inmarsat-4 F3 represents a milestone in the evolution of mobile satellite services, offering improved performance compared to earlier generations. Its deployment contributed to expanding digital inclusion and strengthening crisis communication systems globally.

## References

1. Jonathan's Space Report