QZS-1R
Shape built from published dimensions and pictures; details simplified.
Turn it in 3D
Open the 3D viewer (www.spaceradar.ai).
The viewer loads when you ask: about 700 kB the first time (three.js and the model), much less after.
Pictures 4
Three-quarter view
From the side
From behind
From above
About this model
QZS-1R is one of the 203 3D models Space Radar made itself: a satellite, built in code from published dimensions and photographs, with no image-to-3D generator and no one else’s mesh.
Shape built from published dimensions and pictures; details simplified. It has 16,102 triangles in a 71 kB glTF file, and is 19 m across at full scale.
On Space Radar’s live map it is drawn for 2 catalogued objects, each where its published orbit puts it now. Open it on the map.
Dimensions and their sources
| Measure | Value |
|---|---|
| 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 |
Cabinet Office, Government of Japan, 'QZS-1R Satellite Information', SPI-QZS1R_A (January 20, 2022), qzss.go.jp/en/technical/qzssinfo/khp0mf0000000wuf-att/spi-qzs1r_…, OPENED 2026-11-04 (the list it hangs from: 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), qzss.go.jp/en/technical/qzssinfo/khp0mf0000000wuf-att/spi-qzs6.p…, 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, 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. (read 2026-11-04)
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).
The full record
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)
Where the map uses it. any record of klass satellite named QZS-1R or QZS-6 (2 records in the live saved data of 2026-11-04: QZS-1R (MICHIBIKI-1R), NORAD 49336, and QZS-6 (MICHIBIKI-6), NORAD 62876): the Michibiki bus (2.4 m, 19 m across the wings) with a FLAT octagonal L-band antenna where QZS-2 and QZS-4 have a cone. The Cabinet Office draws both with the same 8 271 mm wings, 2 359 mm body and 14.9 m2 arrays, and the same 2.3 m2 antenna cover; QZS-6's small extra antennas (L1Sb, LXR, ISR: 0.5 m2 together) are not drawn. They were, and while this file is on its way still are, the family navigation box at Galileo's size, a third of theirs; internal #751
Licence note. The shape is this project's, under this repository's licence, built from published numbers (facts). The Cabinet Office's renders compared with are CC BY 4.0 and are not in the file. The Cabinet Office's dimension drawing was READ FOR ITS NUMBERS AND LAYOUT and is not reproduced. NO LOGO AND NO LETTERING is on the mesh.
References 4
What the shape was compared with. None of these pictures is in the file.
- QZS-1R CG02Cabinet Office, Government of JapanCC BY 4.0 (Cabinet Office of Japan, Quasi-Zenith Satellite System website, qzss.go.jp)
- QZS-1R CG05Cabinet Office, Government of JapanCC BY 4.0 (Cabinet Office of Japan, Quasi-Zenith Satellite System website, qzss.go.jp)
- Qzs6-cg01Cabinet Office, Government of JapanCC BY 4.0 (Cabinet Office of Japan, Quasi-Zenith Satellite System website, qzss.go.jp)
- Qzs6-Cg02Cabinet Office, Government of JapanCC BY 4.0 (Cabinet Office of Japan, Quasi-Zenith Satellite System website, qzss.go.jp)
Use it
The model is under the MIT licence: use it, change it and share it, in any project, also a paid one. Keep the credit:
QZS-1R 3D model by Space Radar (spaceradar.ai), MIT LicenseAny glTF 2.0 loader that reads meshopt compression (EXT_meshopt_compression) opens the file: three.js with its MeshoptDecoder, Babylon.js, model-viewer. Tools such as glTF-Transform can write an uncompressed copy.
Or embed the viewer in your page:
<iframe src="https://www.spaceradar.ai/model/?id=qzs-1r" title="QZS-1R, 3D model by Space Radar" width="600" height="450" loading="lazy" style="border:0;max-width:100%"></iframe>Related models
