Contents within planetarium

• 3,967 galaxies
• 430 stars
• 377 duplicate catalogue entries
• 258 nebulae
• 141 double stars
• 53 nebulae
• 38 open clusters
• 35 planetary nebulae
• 32 hII regions
• 18 asterisms
• 14 reflection nebulae
• 9 non-existent objects
• 8 globular clusters
• 2 galaxy pairs
• 2 supernova remnant
• 2 galaxy clusters

Overlap with other object catalogs

• 838 Principal Galaxies Catalogue
• 826 Uppsala General Catalog of galaxies (UGC)
• 65 Markarian galaxies
• 48 Lynds' catalogue of bright nebulae
• 35 Strasbourg-ESO Catalogue of Galactic Planetary Nebulae
• 35 PK planetary nebulae
• 24 Uppsala General Catalog of galaxies addendum (UGCA)
• 21 Collinder catalog
• 18 Van den Bergh catalogue of reflection nebulae
• 15 Arp's catalog of peculiar galaxies
• 10 Melotte catalog
• 7 Caldwell objects
• 2 Abell catalog of planetary nebulae
• 1 Messier objects

Reference

• https://github.com/mattiaverga/OpenNGC

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