# WESTPAC 3D model

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

Free 3D model of WESTPAC, a satellite, built from published dimensions by Space Radar. 5,328 triangles, 40 kB glTF, MIT.

- **Class:** Satellites
- **Mission:** Technology and science
- **Triangles:** 5,328
- **File:** westpac.glb, 40 kB, glTF 2.0 binary (meshopt)
- **Look:** Flat colours
- **Size:** 0.2 m across
- **Made:** Built from dimensions
- **Added:** 2026-10-13
- **NORAD:** 25398
- **Download:** https://raw.githubusercontent.com/Sara-Managed-Projects/space-radar/main/site/models/westpac.glb
- **Mirror:** https://git.sara-agent.org/sara-projects/space-radar/raw/branch/main/site/models/westpac.glb
- **Viewer:** https://www.spaceradar.ai/model/?id=westpac
- **On the live map:** https://www.spaceradar.ai/#at=sat-25398
- **Licence:** MIT (https://github.com/Sara-Managed-Projects/space-radar/blob/main/LICENSE)
- **Credit:** WESTPAC 3D model by Space Radar (spaceradar.ai), MIT License

Canonical: https://models.spaceradar.ai/westpac/

## 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 the published description of WESTPAC's 60 baffled retroreflectors.

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

## Dimensions

- Diameter: 0.245 m
- Retroreflectors: 60

Source: International Laser Ranging Service (NASA-hosted), https://ilrs.gsfc.nasa.gov/missions/satellite_missions/current_missions/west_general.html, opened 2026-10-13: 'diameter of 245 mm, with 60 corner cubes and a mass of 23.757 kg. Each retro-reflector has a baffle tube 31.5 mm high' (THE PAGE DISAGREES WITH ITSELF: its table says 'RRA Diameter: 24 cm'; 245 mm is built); and the description it links, https://ilrs.gsfc.nasa.gov/docs/Westpac_final.pdf, opened 2026-10-13: 'monolith spherical body made from brass'; 'RR are distributed regularly, 3 pieces on spherical surface of ball's segments limited by the sides of imaginary perfect shape with 20 sides (icosahedron).'; 'round diaphragms with entrance apertures of 20.5 mm installed in a distance of 31.5 mm from the frontal side of each RR'; 'In icosahedron's corners there are 10 deaf holes', and threads 'in two opposite corners'. NOT CITED: where the three sit on a face (drawn 17 degrees from its middle toward its corners), a tube's outer width (drawn 34 mm), the colour (drawn pale, as the page's photograph, which is 'Courtesy of EOS' and not free, shows it)

## References

- [WESTPAC, the ILRS mission page](https://ilrs.gsfc.nasa.gov/missions/satellite_missions/current_missions/west_general.html), International Laser Ranging Service; photograph 'Courtesy of EOS' (The page's text is NASA-hosted (the International Laser Ranging Service at Goddard); its photograph is NOT FREE: 'Courtesy of EOS')