# QZS-7 3D model

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

Free 3D model of QZS-7, a satellite, built from published dimensions by Space Radar. 17,390 triangles, 78 kB glTF, MIT.

- **Class:** Satellites
- **Mission:** Navigation
- **Triangles:** 17,390
- **File:** qzs-7.glb, 78 kB, glTF 2.0 binary (meshopt)
- **Look:** Flat colours
- **Size:** 19 m across
- **Made:** Built from dimensions
- **Added:** 2026-11-04
- **NORAD:** 100270
- **Download:** https://raw.githubusercontent.com/Sara-Managed-Projects/space-radar/main/site/models/qzs-7.glb
- **Mirror:** https://git.sara-agent.org/sara-projects/space-radar/raw/branch/main/site/models/qzs-7.glb
- **Viewer:** https://www.spaceradar.ai/model/?id=qzs-7
- **On the live map:** https://www.spaceradar.ai/#at=sat-100270
- **Licence:** MIT (https://github.com/Sara-Managed-Projects/space-radar/blob/main/LICENSE)
- **Credit:** QZS-7 3D model by Space Radar (spaceradar.ai), MIT License

Canonical: https://models.spaceradar.ai/qzs-7/

## 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: 2.359 m
- Body 2: 2.4 m
- Wing: 8.271 m
- Span: 18.901 m
- Solar array area: 14.9 m²
- L ant cover: 2.3 m²

Source: Cabinet Office, Government of Japan, 'QZS-7 Satellite Information', SPI-QZS7 (Oct 19, 2026), https://qzss.go.jp/en/technical/qzssinfo/khp0mf0000000wuf-att/spi-qzs7.pdf, OPENED 2026-11-04 (the list it hangs from: https://qzss.go.jp/en/technical/qzssinfo/index.html), section 6 'Geometry', 'Figure 4 Satellite dimensions' '(Unit: mm)', whose dimension lines read 8271, 2359, 8271 (each wing, the body, the other wing) and 18901 (tip to tip), the figure drawing two reflectors; Table 4 'Optical properties': 'SAP 14.9' m2 on each Y face, '+X MLI 10.0', '+Z MLI 3.2', 'L-ANT Cover 2.3', 'LXR/ISR-ANT Covers 0.5', '-Z MLI 5.6', 'Reflector-1' and 'Reflector-2' with the notes 'Reflector-1 orients so that the normal vector of the front surface is (-0.443, -0.062, 0.895). Reflector-2 orients so that the normal vector of the front surface is (0.294, -0.254, 0.922).'; 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.' DERIVED: the same bus as QZS-2 and QZS-1R (a box 2.359 x 2.4 x 4.25 m, wings of two 3.2 x 2.33 m panels on 1.9 m yokes); the cover read as a regular octagon 1.67 m across; the reflectors' sizes (an oval about 3 m by 4 m and a dish 1 m across) read off the figure's scale. READ OFF THE FIGURE AND THE PICTURES (CC BY 4.0): Reflector-1 a large dish hung from the bottom of the +X face and standing out to the side and up, drawn as a yellow mesh; Reflector-2 a small dark dish on the -X face near the top; the black blanket with its silver tiles; the octagonal patch. OURS: the dishes' depth, exact size and holders, the tiles, the deck's corner units. The reflectors are drawn solid; the real ones are a mesh.

## References

- [Qzs-7 02](https://commons.wikimedia.org/wiki/File:Qzs-7_02.png), Cabinet Office, Government of Japan (CC BY 4.0 (Cabinet Office of Japan, Quasi-Zenith Satellite System website, qzss.go.jp))
- [Qzs-7 04](https://commons.wikimedia.org/wiki/File:Qzs-7_04.png), Cabinet Office, Government of Japan (CC BY 4.0 (Cabinet Office of Japan, Quasi-Zenith Satellite System website, qzss.go.jp))