Exotech bright-star subset of HYG Database v4.1.
Source: https://github.com/astronexus/HYG-Database/tree/main/hyg/CURRENT
Author: David Nash / Astronomy Nexus, https://www.astronexus.com/hyg
Current upstream: https://codeberg.org/astronexus/hyg
Retrieved 2026-09-21. Source coordinates: J2000, RA hours, Dec degrees.
Changes by Exotech: selected stars with visual magnitude <= 3 plus constellation
anchors; kept HIP, RA, Dec, magnitude; translated selected names and added notes.
Added Czech constellation names, catalogue spectral types, and approximate
distances in light-years (catalogue parsecs multiplied by 3.26156).
Distances are historical catalogue estimates, not newly measured values.
This adapted data file (sky-stars.json) is distributed under CC BY-SA 4.0:
https://creativecommons.org/licenses/by-sa/4.0/
See sky-stars-LICENSE.txt. This data licence does not apply to unrelated app code.