Hitomi
Shape built from an artist’s render; proportions approximate.
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
Hitomi is one of the 203 3D models Space Radar made itself: a space telescope, generated from a public-domain picture with TRELLIS (Microsoft Research, MIT licence), then repaired, measured and completed in code.
Shape built from an artist’s render; proportions approximate. It has 13,284 triangles in a 138 kB glTF file, and is 14 m across at full scale.
On Space Radar’s live map it is drawn for the object with NORAD catalogue number 41337, where its published orbit puts it now. Open it on the map.
Dimensions and their sources
| Measure | Value |
|---|---|
| Total length | 14 m |
| Bench | 6.4 m |
| Body height | 7.9 m |
| Span | 9.2 m |
Takahashi et al., 'The ASTRO-H X-ray Astronomy Satellite', ar5iv.labs.arxiv.org/html/1412.1356, opened 2026-10-13: 'Total Length 14 m'; 'The focal length of the HXTs is 12 m. The Hard X-ray Imaging detectors (HXIs) are mounted on the HXI plate, at the end of a 6 m extendable optical bench (EOB) that is stowed to fit in the launch fairing and deployed once in orbit.' JAXA's press kit, global.jaxa.jp/projects/sat/astro_h/files/astroh_presskit.pdf, opened 2026-10-13, figure 3.1: 'Overall length ~14 m', 'Extensible Optical Bench (EOB) ~6.4 m'. THE TWO DISAGREE on the bench by 0.4 m; the 6.4 m is built, which with the body's 7.9 m is 14.3 m. The body's 7.9 m and the 9.2 m span are XRISM's (row `xrism`): no source opened gives Hitomi's body or its paddles alone. The breakup, JAXA, global.jaxa.jp/press/2016/04/20160428_hitomi.html, opened 2026-10-13: 'it is highly likely that both solar array paddles had broken off at their bases where they are vulnerable to rotation.' NOT CITED: the bench's 0.7 m side, the HXI plate's 1.9 m, the detectors' boxes and which side panels they sit on (read 2026-10-13)
How it was made
Generated from a public-domain picture with TRELLIS (Microsoft Research, MIT licence), then repaired, measured and completed in code. 3D model: body generated from NASA Goddard renders of XRISM with TRELLIS (Microsoft Research, MIT); Hitomi's optical bench and detectors built by Space Radar from published dimensions and NASA drawings.
The full record
github.com/microsoft/TRELLIS — THE BODY IS XRISM'S: the mesh TRELLIS generated on 2026-10-13 from two frames of NASA Goddard's turntable render of XRISM (row `xrism`), which is Hitomi's recovery mission on the same bus; nothing was generated for this row. Hitomi's own parts, the extensible optical bench, the HXI plate and its two imagers, the two soft gamma-ray detectors, and both solar paddles were built in code
Where the map uses it. NORAD 41337 (ASTRO-H (HITOMI)), on the layer of bright satellites: JAXA's X-ray observatory, which broke apart on 26 March 2016. It was the generic space telescope, which is still what is drawn while this file is on its way; public #969. THE FILE IS THE CRAFT AS LAUNCHED; the catalogue object is its main body, and the card says so (scene/realmodels.js `was`)
Licence note. Public domain (the NASA Goddard renders of XRISM the body was generated from, and NASA's drawing and NASA/HEASARC's schematic of Hitomi the other parts were drawn from); MIT (TRELLIS, code and weights, whose licence makes no claim on what the model outputs); the repairs, the parts built in code, the proportions and the colours are this project's, under this repository's licence
References 4
What the shape was compared with. None of these pictures is in the file.
- XRISM 001NASA's Goddard Space Flight Center Conceptual Image LabPublic domain (NASA's Goddard Space Flight Center Conceptual Image Lab)
- XRISM 004NASA's Goddard Space Flight Center Conceptual Image LabPublic domain (NASA's Goddard Space Flight Center Conceptual Image Lab)
- HitomiNASAPublic domain (NASA)
- Astro-H schema (en)NASA/HEASARCPublic domain (NASA/HEASARC)
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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:
Hitomi 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=hitomi" title="Hitomi, 3D model by Space Radar" width="600" height="450" loading="lazy" style="border:0;max-width:100%"></iframe>Related models
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