OpenNGC deep-sky catalog asset

Source: https://github.com/mattiaverga/OpenNGC
License: CC-BY-SA-4.0
Generated from database_files/NGC.csv and database_files/addendum.csv on 2026-07-06.

Supplemental calibrated photographs (2026-10-20)
303 additional images from Stellarium revision 230f2bd84b7827fb16be2a54c2ebdae07edf17a6.
These image assets have their own per-image CC BY, CC BY-SA, CC0 or public-domain
terms, independent of the catalog and application source licenses.
Full author credits, original sources, retained licenses, prior processing,
and modification notices: deep_sky_image_credits.json and in-app Image Credits.
Images adapted by PlanIt (size adjustment, black-matte removal, edge feathering,
lossless WebP conversion) retain the listed image licenses.
The app source-code license does not replace or restrict these image licenses.

Bright-object photo additions (2026-10-20)
55 photos for previously unillustrated magnitude <= 8 objects. Sources:
- Legacy Surveys optical Sky Viewer layers ls-dr10 and decaps2, CC BY 4.0.
  Legacy Surveys / D. Lang (Perimeter Institute)
  https://www.legacysurvey.org/acknowledgment/
- Stellarium pinned calibrated textures: individual CC BY, CC BY-SA or
  public-domain permission; upstream authors and evidence retained.
- ESO NGC 104, CC BY 4.0; original AVM calibration and crop recorded.
Per-image source, author, licensing, WCS/AVM, hashes and modification notices:
bright_deep_sky_image_credits.json and in-app Image Credits. These image
licenses remain independent of the application code license.

Remaining bright-object additions (2026-10-20)
99 additional photos cover 100 previously unillustrated bright objects.
90 PS1 fields/mosaics retain the STScI PS1 Data Use grant and full survey
acknowledgements; they are NOT relabeled as Creative Commons material.
https://registry.opendata.aws/mast-panstarrs/
Published ESO, NOIRLab and ESA/Hubble photos and the calibrated Stellarium LMC
composite retain CC BY 4.0 and full source credits. NGC 5986 uses public HST
science data, program 10775, under the MAST data-use policy. Full provenance,
source links, WCS, author/funder acknowledgements, original permissions and
modification records: followup_deep_sky_image_credits.json and Image Credits.
Image/data permissions remain independent of the application source license.
