# ISIS 1 3D model

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

Free 3D model of ISIS 1, a satellite, built from published dimensions by Space Radar. 12,694 triangles, 134 kB glTF, MIT.

- **Class:** Satellites
- **Mission:** Technology and science
- **Triangles:** 12,694
- **File:** isis-1.glb, 134 kB, glTF 2.0 binary (meshopt)
- **Look:** Physically based
- **Size:** 73 m across
- **Made:** Built from dimensions
- **Added:** 2026-10-21
- **NORAD:** 3669
- **Download:** https://raw.githubusercontent.com/Sara-Managed-Projects/space-radar/main/site/models/isis-1.glb
- **Mirror:** https://git.sara-agent.org/sara-projects/space-radar/raw/branch/main/site/models/isis-1.glb
- **Viewer:** https://www.spaceradar.ai/model/?id=isis-1
- **On the live map:** https://www.spaceradar.ai/#at=sat-3669
- **Licence:** MIT (https://github.com/Sara-Managed-Projects/space-radar/blob/main/LICENSE)
- **Credit:** ISIS 1 3D model by Space Radar (spaceradar.ai), MIT License

Canonical: https://models.spaceradar.ai/isis-1/

## 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 NASA's and Canada's published dimensions; compared with NASA's photograph (public domain).

built by this project in code (release 1.3.0 stage W3-a's part library, lib.py, and one script a craft, kept with the stage's notes); no image-to-3D model was used, and no published mesh: NASA's 3D Resources (1 583 paths) and NASA Science's 3D models have none of this craft (read 2026-10-20)

## Dimensions

- Diameter: 1.27 m
- Height: 1.04 m
- Long dipole: 73 m
- Short dipole: 18.7 m

Source: NRC Science Dimension, Dec. 1969, reprinted at https://ewh.ieee.org/reg/7/millennium/isis/isis_study.html, OPENED 2026-10-20: 'It has a diameter of 50 inches, a height of 41 inches and weighs 525 pounds'; the schematic: 'SOUNDER ANTENNA 240 FT. TIP TO TIP', 'SOUNDER ANTENNA 61.5 FT. TIP TO TIP', 'SOLAR CELL PANELS (16)'. NSSDCA 1969-009A (web.archive.org copy, the live catalogue erred that day): 'The sounder used two dipole antennas (73 and 18.7 m long). The satellite was spin-stabilized at about 2.9 rpm'. THE DIPOLES ARE DRAWN SHORT, illustrative: 6.0 m and 3.0 m tip to tip, because the app scales a model's longest side to one unit and a 73 m dipole would leave the 1.27 m drum a dot. OURS: the belt height (0.17 m), every instrument's size and place, the probes' lengths and angles

## References

- [ISIS 1 (NSSDCA spacecraft image)](https://nssdc.gsfc.nasa.gov/planetary/image/isis_1.jpg), NASA (Public domain (NASA NSSDCA))
- [ISIS 2 experimenters report, NASA 19810015208](https://ntrs.nasa.gov/citations/19810015208), NASA (Public domain (NASA report))
- [NRC Science Dimension, December 1969 (reprinted by IEEE Canada)](https://ewh.ieee.org/reg/7/millennium/isis/isis_study.html), National Research Council Canada (Crown copyright (NRC); looked at only)
- [Canadian Space Agency, ISIS I and II](https://www.asc-csa.gc.ca/eng/satellites/isis.asp), Canadian Space Agency / Communications Research Centre (Government of Canada; looked at only)