# Inmarsat-4 3D model

> Shape built from published dimensions and pictures; details simplified.

Free 3D model of Inmarsat-4, a satellite, built from published dimensions by Space Radar. 11,298 triangles, 90 kB glTF, MIT.

- **Class:** Satellites
- **Mission:** Communications
- **Triangles:** 11,298
- **File:** inmarsat-4.glb, 90 kB, glTF 2.0 binary (meshopt)
- **Look:** Flat colours
- **Size:** 45 m across
- **Made:** Built from dimensions
- **Added:** 2026-10-27
- **NORAD:** 28628, 28899, 33278
- **Download:** https://raw.githubusercontent.com/Sara-Managed-Projects/space-radar/main/site/models/inmarsat-4.glb
- **Mirror:** https://git.sara-agent.org/sara-projects/space-radar/raw/branch/main/site/models/inmarsat-4.glb
- **Viewer:** https://www.spaceradar.ai/model/?id=inmarsat-4
- **On the live map:** https://www.spaceradar.ai/#at=sat-28628
- **Licence:** MIT (https://github.com/Sara-Managed-Projects/space-radar/blob/main/LICENSE)
- **Credit:** Inmarsat-4 3D model by Space Radar (spaceradar.ai), MIT License

Canonical: https://models.spaceradar.ai/inmarsat-4/

## How it was made

Built in code from published dimensions and photographs, with no image-to-3D generator and no one else’s mesh. 3D model: built by Space Radar from published dimensions (McDowell's GCAT, CC BY; Astrium's press kit; no free picture of the craft).

built by this project in code (the private tool model-from-images: assemble.py, from a yaml of primitives), from the cited dimensions and the pictures under `references`; no image-to-3D model was used, and no published mesh (NASA Science's 3D models and NASA's 3D Resources have none of this craft, and the maker and the operator publish none under terms that allow a derivative); the layout and its sources are under `references` and `dimensions`

## Dimensions

- Body x: 2.9 m
- Body y: 2.3 m
- Body z: 7 m
- Span: 45 m
- Reflector: 9 m
- Array power kw bol: 14
- Mass: 5959 kg

Source: J. McDowell, 'General Catalog of Artificial Space Objects' (GCAT), https://planet4589.org/space/gcat/ , satcat.tsv of 2026-10-26, OPENED 2026-10-27 (licence on the page: 'GCAT is released under the Creative Commons CC-BY licence'); columns Length, Diameter, Span, Shape: INMARSAT 4 F1 to F3 'Length 7.0, Diameter 2.9, Span 45.0' m, shape 'Box + 2 Pan' (F2 and F3 'Box + 2 Pan + Dish'). Astrium's 2005 press kit, 'First Inmarsat-4 satellite ready for launch', https://spaceref.com/?p=42959 , read through a search result of 2026-10-27: 'Main body dimensions: 7 x 2.9 x 2.3m'; 'Solar array span: 45m'; 'Solar array power: approximately 14 kW at beginning of life'; 'the unfurlable antenna reflector has a diameter of about 10 metres'. Northrop Grumman (Astro Aerospace) as quoted in the same search: 'three 9-meter AstroMesh reflectors'. Gunter's Space Page, https://space.skyrocket.de/doc_sdat/inmarsat-4.htm , OPENED 2026-10-27: 'Eurostar-3000GM'; 2 deployable solar arrays; mass 5959 kg. TWO PAGES DISAGREE on the reflector (9 m, 'about 10 m'): the 9 m of the maker of the reflector is built. NOT CITED: the panels' number and width, the reflector's place and tilt, the feed array's size and count, the thrusters.

## References

- [inmarsat-4__1](https://space.skyrocket.de/doc_sdat/inmarsat-4.htm), Gunter's Space Page (the render's maker is not named there) (an artist's render on Gunter's Space Page (copyright of its maker): LOOKED AT ONLY for the layout: the round mesh reflector standing off the Earth end on a boom, the long five-panel wings, the gold body; not fetched by the tool, on no sheet, nothing of it in the file)