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German KhokhlovandClaude Opus 5.5
8c33c6f349
The far-plane comment said z = w (the code puts z just under w), the Milky Way constant is a brightness, not an opacity, and the CDS acknowledgement lives in the Data attribution popover, not DATA_SOURCES.md. Co-Authored-By: Claude Opus 5.5 <[email protected]>
52 lines
2.0 KiB
Markdown
52 lines
2.0 KiB
Markdown
# Sky background
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Catalogue stars over a soft Milky Way, drawn by `src/sky/starrySky.js` in
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place of Cesium's blocky Tycho-2 sky box.
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| File | Content | Size |
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| ---- | ------- | ---- |
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| `bright_stars.json` | 9,096 stars: J2000 RA/Dec, V magnitude, B−V | 235 KB |
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| `milkyway_{px,nx,py,ny,pz,nz}.webp` | Milky Way glow, six 1024² cube faces, no stars | 62 KB |
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## Stars — Yale Bright Star Catalogue
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**Source:** 5th Revised Edition (Hoffleit & Warren 1991), CDS catalogue
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[V/50](https://cdsarc.cds.unistra.fr/viz-bin/cat/V/50), file
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`https://cdsarc.cds.unistra.fr/ftp/V/50/catalog.gz` (sha256
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`3dc44b1e90be8fbe5bcc7656032560f51275f985c7e3f783c9028e1838ec7bed`, fetched
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2026-10-19).
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**License:** public domain. CDS asks for an acknowledgement; the "Data
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attribution" popover carries it.
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**Build:** `node scripts/build-bright-stars.mjs [catalog.gz]`. Drops the 14
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records without a J2000 position; rounds RA/Dec to 0.001° and magnitudes to
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0.01.
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## Milky Way — ESO/S. Brunier
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**Source:** ESO image [eso0932a](https://www.eso.org/public/images/eso0932a/),
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`https://cdn.eso.org/images/original/eso0932a.tif` (6000×3000 sRGB TIFF, sha256
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`10f209ab83e1fd89e7fa1ed70277ffc6ed19c43549f04ec637c6806d98aff035`, fetched
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2026-10-19).
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**License:** [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).
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**Credit: ESO/S. Brunier.**
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**Changes made** (CC BY 4.0 asks for them): resampled to 4096×2048; stars
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removed; two images of Jupiter painted over; blurred (0.4°, 2° in the faint
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glow); reprojected to ICRF cube faces; black level at the median sky; saved as
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WebP. Build: `node scripts/build-milky-way.mjs <eso0932a.tif>`.
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The panorama's stars sit up to ~2° off; that is invisible in the blurred glow,
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and every sharp star comes from the catalogue.
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NASA SVS "Deep Star Maps 2020" was not used: it derives from Gaia DR2, which
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ESA licenses CC BY-NC 3.0 IGO.
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## Frame
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Both layers are in ICRF/J2000. The cube faces use the WebGL face layout, +X
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to the March equinox and +Z to the north celestial pole, uploaded without
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`flipY`.
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