# QZS-3 3D model

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

Free 3D model of QZS-3, a satellite, built from published dimensions by Space Radar. 17,150 triangles, 77 kB glTF, MIT.

- **Class:** Satellites
- **Mission:** Navigation
- **Triangles:** 17,150
- **File:** qzs-3.glb, 77 kB, glTF 2.0 binary (meshopt)
- **Look:** Flat colours
- **Size:** 19 m across
- **Made:** Built from dimensions
- **Added:** 2026-11-04
- **NORAD:** 42917
- **Download:** https://raw.githubusercontent.com/Sara-Managed-Projects/space-radar/main/site/models/qzs-3.glb
- **Mirror:** https://git.sara-agent.org/sara-projects/space-radar/raw/branch/main/site/models/qzs-3.glb
- **Viewer:** https://www.spaceradar.ai/model/?id=qzs-3
- **On the live map:** https://www.spaceradar.ai/#at=sat-42917
- **Licence:** MIT (https://github.com/Sara-Managed-Projects/space-radar/blob/main/LICENSE)
- **Credit:** QZS-3 3D model by Space Radar (spaceradar.ai), MIT License

Canonical: https://models.spaceradar.ai/qzs-3/

## 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 dimensions in the Cabinet Office of Japan's satellite information; compared with renders from the Quasi-Zenith Satellite System website (CC BY 4.0).

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's 3D Resources on GitHub, 1 583 paths read 2026-10-13, has none of this craft; the survey of 2026-10-13 found no agency model of it under usable terms)

## Dimensions

- Body 1: 2.4 m
- Body 2: 2.4 m
- Height: 5.41 m
- Wing: 8.3 m
- Span: 19 m
- Depth with reflectors: 7.1 m
- Solar array area: 14.9 m²
- L ant cover: 2.1 m²
- Reflector 1: 9.1 m²
- Reflector 2: 0.8 m²

Source: Cabinet Office, Government of Japan, 'QZS-3 Satellite Information', SPI-QZS3_F (March 28, 2025, revision F), https://qzss.go.jp/en/technical/qzssinfo/khp0mf0000000wuf-att/spi-qzs3_f.pdf, OPENED 2026-11-04 (the list it hangs from: https://qzss.go.jp/en/technical/qzssinfo/index.html), section 1: 'QZS-3 GEO satellite'; section 6 'Geometry', 'Figure 4 Satellite dimensions' '(Unit: mm)', whose dimension lines read 8300, 2400, 8300 (each wing, the body, the other wing), 5410 (height) and 7100 (the extent along X with the reflectors out), the figure's two reflectors named 'Reflector-1' and 'Reflector-2'; Table 4 'Optical properties': 'Reflector-1 (Front) 9.1' m2, 'Reflector-2 (Front) 0.8' m2, 'SAP 14.9' m2 on each Y face, '+Y MLI 5.0, Radiator 5.1', '-Y MLI 4.8, Radiator 5.3', '+X MLI 10.1', '-X MLI 10.1', '+Z MLI 3.0', 'L-ANT Cover 2.1', 'L1S/Sb/L5S-ANT Covers 0.4', '-Z MLI 5.6'; its note 3: 'Reflector-1 is oriented towards the direction displaced from +Z axis by approximately +5deg and -25deg around +X and +Y axes respectively. Its area corresponds to the area projected along the direction.'; its note 4: 'Reflector-2 is oriented towards the direction displaced from +Z axis by approximately +20deg and +15deg around +X and +Y axes respectively.'; section 2: 'The +Z-axis is oriented to the bore sight direction of the L-ANT antenna. The +Y-axis is parallel to the rotation axis of the solar panels'; section 3 'Attitude Law': 'Yaw steering mode: The +z-axis is pointing to the Earth. The y-axis is oriented perpendicular to the plane made up by the Sun, Earth and satellite.' eoPortal, https://www.eoportal.org/satellite-missions/qzss, OPENED 2026-10-13: 'QZS-3 uses a flat patch antenna'. DERIVED: the two normals from those angles, (-0.421, -0.087, 0.903) and (0.243, -0.342, 0.908) in the Cabinet Office's axes; the 2.1 m2 cover read as a regular octagon 1.59 m across; the bus as for QZS-2 (a box 2.4 x 2.4 x 4.25 m, wings of two 3.2 x 2.33 m panels on 1.9 m yokes). READ OFF THE FIGURE AND THE PICTURES: Reflector-1 an oval about 3 m by 4 m hung from the bottom of the +X face and standing out to the side and up, its far rim about 5 m from the axis; Reflector-2 a small dish on the -X face near the top; the octagonal patch; the tiles; the black blanket. OURS: the dishes' depth and exact size and how they are held (two arms), the tiles, the deck's corner units. The reflectors are drawn solid and bronze; the real ones are a thin mesh, which the pictures show as a brown dish.

## References

- [QZS-3 CG02](https://commons.wikimedia.org/wiki/File:QZS-3_CG02.png), Cabinet Office, Government of Japan (CC BY 4.0 (Cabinet Office of Japan, Quasi-Zenith Satellite System website, qzss.go.jp))
- [QZS-3 CG05](https://commons.wikimedia.org/wiki/File:QZS-3_CG05.png), Cabinet Office, Government of Japan (CC BY 4.0 (Cabinet Office of Japan, Quasi-Zenith Satellite System website, qzss.go.jp))