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Epic: Star Catalogues & Deep Sky Data #72

@zworkb

Description

@zworkb

Problem

Current skydata only contains stars up to magnitude ~7 (Norder 0+1 from Stellarium build). Deeper tiles cannot be downloaded from stellarium-web.org (server returns HTML). EPH tiles must be generated from raw catalogues.

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Data Sources

Notes

  • EPH = Stellarium's proprietary binary HEALPix tile format
  • Tile structure: skydata/stars/NorderN/Dir0/NpixM.eph
  • Engine's stars_limit_mag is FOV-dependent — fainter stars only shown at higher zoom
  • Norder 0 = 12 tiles, Norder 3 = 768 tiles, Norder 6 = 49152 tiles

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