# Spacebus 4000B satellite bus 3D model

> Shape built from published dimensions and the maker’s renders; details estimated.

Free 3D model of Spacebus 4000B satellite bus, a satellite, built from published dimensions by Space Radar. 15,468 triangles, 113 kB glTF, MIT.

- **Class:** Satellites
- **Mission:** Communications
- **Triangles:** 15,468
- **File:** bus-spacebus-4000b.glb, 113 kB, glTF 2.0 binary (meshopt)
- **Look:** Physically based
- **Size:** 30 m across
- **Made:** Built from dimensions
- **Added:** 2026-11-08
- **Download:** https://raw.githubusercontent.com/Sara-Managed-Projects/space-radar/main/site/models/bus-spacebus-4000b.glb
- **Mirror:** https://git.sara-agent.org/sara-projects/space-radar/raw/branch/main/site/models/bus-spacebus-4000b.glb
- **Viewer:** https://www.spaceradar.ai/model/?id=bus-spacebus-4000b
- **Licence:** MIT (https://github.com/Sara-Managed-Projects/space-radar/blob/main/LICENSE)
- **Credit:** Spacebus 4000B satellite bus 3D model by Space Radar (spaceradar.ai), MIT License

Canonical: https://models.spaceradar.ai/bus-spacebus-4000b/

## 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, Wikipedia); layout read from the makers' photographs and renders, looked at only.

built by this project in code (tools/bus-builder, release 2.0.0 batch m4-buses) from published sizes, with the photographs and the maker's renders under `references` LOOKED AT ONLY; no image-to-3D model was used and no published mesh (NASA 3D Resources has none of this bus)

## Dimensions

- Body x: 1.8 m
- Body y: 1.8 m
- Body z: 3.4 m
- Span: 30 m
- Reflector: 2.2 m

Source: Wikipedia 'Spacebus' (read 2026-11-07): the B series on the 3000 series' structure, the 4000B3 3.7 m high. GCAT, the B rows: Diameter 1.8 m for most (2.3 to 3.5 for a few), Length 2.8 to 5.5 m, Span 17 to 38 m (median 30). Drawn: a box 1.8 x 1.8 x 3.4 m (4.4 m with the deck antennas), 30.0 m over the wings. OURS (ESTIMATED): the reflectors' 2.2 and 2.0 m and their places and tilts, four panels of 2.2 x 2.85 m a wing, the 2.0 m yoke, the radiators' 0.5 m of extra width.

## References

- [Satellite Inmarsat GX5.jpg](https://commons.wikimedia.org/wiki/File:Satellite_Inmarsat_GX5.jpg), as named on the Commons file page (CC BY-SA 4.0 (Commons LicenseShortName, read 2026-11-07))
- [Athena-Fidus (Gunter's Space Page)](https://space.skyrocket.de/doc_sdat/athena-fidus.htm), Thales Alenia Space, via Gunter's Space Page (Gunter D. Krebs) (copyright Thales Alenia Space (a maker's render; looked at only, no part of it is in a file))
- [Bangabandhu-1 (Gunter's Space Page)](https://space.skyrocket.de/doc_sdat/bangabandhu-1.htm), Thales Alenia Space, via Gunter's Space Page (Gunter D. Krebs) (copyright Thales Alenia Space (a maker's render; looked at only, no part of it is in a file))
- [Galaxy 17 (Gunter's Space Page)](https://space.skyrocket.de/doc_sdat/galaxy-17.htm), Thales Alenia Space, via Gunter's Space Page (Gunter D. Krebs) (copyright Thales Alenia Space (a maker's render; looked at only, no part of it is in a file))
- [Merah Putih 2 (Gunter's Space Page)](https://space.skyrocket.de/doc_sdat/hts-113bt.htm), Thales Alenia Space, via Gunter's Space Page (Gunter D. Krebs) (copyright Thales Alenia Space (a maker's render; looked at only, no part of it is in a file))
- [Wikipedia: Spacebus](https://en.wikipedia.org/wiki/Spacebus), Wikipedia contributors (CC BY-SA 4.0 (the numbers are facts; nothing else is copied))
- [General Catalog of Artificial Space Objects (GCAT), satcat.tsv of 2026-11-07](https://planet4589.org/space/gcat/tsv/cat/satcat.tsv), Jonathan C. McDowell (CC BY 4.0 (the catalogue's own statement))