# QZS-1R 3D model

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

Free 3D model of QZS-1R, a satellite, built from published dimensions by Space Radar. 16,102 triangles, 71 kB glTF, MIT.

- **Class:** Satellites
- **Mission:** Navigation
- **Triangles:** 16,102
- **File:** qzs-1r.glb, 71 kB, glTF 2.0 binary (meshopt)
- **Look:** Flat colours
- **Size:** 19 m across
- **Made:** Built from dimensions
- **Added:** 2026-11-04
- **NORAD:** 49336, 62876
- **Download:** https://raw.githubusercontent.com/Sara-Managed-Projects/space-radar/main/site/models/qzs-1r.glb
- **Mirror:** https://git.sara-agent.org/sara-projects/space-radar/raw/branch/main/site/models/qzs-1r.glb
- **Viewer:** https://www.spaceradar.ai/model/?id=qzs-1r
- **On the live map:** https://www.spaceradar.ai/#at=sat-49336
- **Licence:** MIT (https://github.com/Sara-Managed-Projects/space-radar/blob/main/LICENSE)
- **Credit:** QZS-1R 3D model by Space Radar (spaceradar.ai), MIT License

Canonical: https://models.spaceradar.ai/qzs-1r/

## 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
- Height: 5.405 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-1R Satellite Information', SPI-QZS1R_A (January 20, 2022), https://qzss.go.jp/en/technical/qzssinfo/khp0mf0000000wuf-att/spi-qzs1r_a_220120.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), 2869 (the antenna deck seen from the wing's side) and 5405 (height); Table 4 'Optical properties': 'SAP 14.9' m2 on each Y face, '+Y MLI 5.1, Radiator 4.9', '-Y MLI 5.6, Radiator 4.5', '+X MLI 10.8', '-X MLI 10.8', '+Z MLI 3.4', 'L-ANT Cover 2.3', 'L1S/L5S-ANT Covers 0.3', '-Z MLI 5.6'; Table 2 puts the L-band phase centres 4403.89 to 4843.89 mm above the launch-adapter plane and Table 5 the laser retro-reflector's optical centre at (-700.0, -900.0, +4373.3) mm; 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.' The same office's QZS-6 document, SPI-QZS6 (Mar 28, 2025), https://qzss.go.jp/en/technical/qzssinfo/khp0mf0000000wuf-att/spi-qzs6.pdf, OPENED 2026-11-04, draws the same 8271, 2359, 8271 and 18901 and the same 14.9 m2 arrays and 'L-ANT Cover 2.3'; it adds small L1Sb, LXR and ISR antennas ('L1Sb/LXR/L5S/ISR-ANT Covers 0.5'), which are not drawn here. eoPortal, https://www.eoportal.org/satellite-missions/qzss, OPENED 2026-10-13: 'QZS-1, QZS-2, and QZS-4 have L-band antennas that are helical array antennas, but QZS-3 uses a flat patch antenna'. DERIVED: the 2.3 m2 cover read as a regular octagon 1.67 m across (the pictures show an octagon); a height of 5.405 m is the QZS-2 bus (6.2 m with its 0.8 m cone, SPI-QZS2_C) with the cone left off; the body's box is 4.25 m long (a 10.1 m2 side face over 2.4 m) and each wing is two panels of 3.2 x 2.33 m on a 1.9 m yoke, as for QZS-2. READ OFF THE CABINET OFFICE'S PICTURES (CC BY 4.0): the octagonal patch and its frame on the Earth deck, two columns of four silver tiles on each of the two big faces, the black blanket, the three small white units on the face the wings stand on, the V yoke. OURS: the tiles' sizes, the deck's corner units.

## References

- [QZS-1R CG02](https://commons.wikimedia.org/wiki/File:QZS-1R_CG02.png), Cabinet Office, Government of Japan (CC BY 4.0 (Cabinet Office of Japan, Quasi-Zenith Satellite System website, qzss.go.jp))
- [QZS-1R CG05](https://commons.wikimedia.org/wiki/File:QZS-1R_CG05.png), Cabinet Office, Government of Japan (CC BY 4.0 (Cabinet Office of Japan, Quasi-Zenith Satellite System website, qzss.go.jp))
- [Qzs6-cg01](https://commons.wikimedia.org/wiki/File:Qzs6-cg01.png), Cabinet Office, Government of Japan (CC BY 4.0 (Cabinet Office of Japan, Quasi-Zenith Satellite System website, qzss.go.jp))
- [Qzs6-Cg02](https://commons.wikimedia.org/wiki/File:Qzs6-Cg02.png), Cabinet Office, Government of Japan (CC BY 4.0 (Cabinet Office of Japan, Quasi-Zenith Satellite System website, qzss.go.jp))