# Umbra 3D model

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

Free 3D model of Umbra, a satellite, built from published dimensions by Space Radar. 7,836 triangles, 62 kB glTF, MIT.

- **Class:** Satellites
- **Mission:** Earth observation
- **Triangles:** 7,836
- **File:** umbra.glb, 62 kB, glTF 2.0 binary (meshopt)
- **Look:** Flat colours
- **Size:** 3.8 m across
- **Made:** Built from dimensions
- **Added:** 2026-10-13
- **Download:** https://raw.githubusercontent.com/Sara-Managed-Projects/space-radar/main/site/models/umbra.glb
- **Mirror:** https://git.sara-agent.org/sara-projects/space-radar/raw/branch/main/site/models/umbra.glb
- **Viewer:** https://www.spaceradar.ai/model/?id=umbra
- **Licence:** MIT (https://github.com/Sara-Managed-Projects/space-radar/blob/main/LICENSE)
- **Credit:** Umbra 3D model by Space Radar (spaceradar.ai), MIT License

Canonical: https://models.spaceradar.ai/umbra/

## 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 and the drawing in Umbra's orbital debris report filed with the FCC.

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; its operator is not known to publish one, and a model on a marketplace is somebody else's work)

## Dimensions

- Bus side: 0.58 m
- Bus height: 0.19 m
- Deployed across: 3.8 m
- Deployed height: 2 m

Source: Umbra Lab, Inc., 'Orbital Debris Assessment Report for Umbra SAR', document 1604D0048 revision 02 (under `references`), opened 2026-10-13 through a reader (the FCC's server refuses curl), section 2.1: 'The bus structure consists of an aluminum frame with machined aluminum panels and has dimensions of approximately 58 cm x 58 cm x 19 cm, not including the solar arrays which reside in a stowed condition on either side of the bus. The payload is approximately 74 cm x 53 cm diameter in the stowed position. When deployed into the operational configuration, the maximum physical dimensions of the space vehicle are approximately 3.8 m x 3.8 m x 2.0 m.'; section 2.6: 'The nominal attitude mode places the satellite in a “Nadir Pointing” orientation'; section 2.8: 'solar cells mounted on the two (2) deployable solar array wings extending from the bus structure'; its list of parts names a 'Root Rib' and 'Rib Fitting'. eoPortal, https://www.eoportal.org/satellite-missions/umbra-sar, opened 2026-10-13: 'Each Umbra satellite houses a centre-fed parabolic mesh reflector SAR antenna'; 'Deployed antenna size (square metres) 10' (a circle of 10 m2 is 3.57 m across; the filing's 3.8 m is built, over the rib tips). NOT CITED, read off the filing's drawing: the dish's depth (0.67 m), the column's 1.65 m, the solar arrays' 0.9 x 0.31 m and that they lie flat beside the bus. OURS: 24 ribs (the filing names ribs and no count), the net's five rings, which way the dish opens (toward the Earth: 'Nadir Pointing' names no face). THE FILING IS OF THE EARLY CRAFT (about 70 kg); later ones may differ

## References

- [Umbra Lab, Inc., Orbital Debris Assessment Report for Umbra SAR (1604D0048 revision 02)](https://apps.fcc.gov/els/GetAtt.html?id=252268), Umbra Lab, Inc. (a public filing with the FCC's experimental licensing system, read; the drawing is Umbra's and nothing of it is reproduced)