Contents within planetarium

• 6,020 galaxies
• 640 open clusters
• 270 duplicate catalogue entries
• 196 globular clusters
• 158 nebulae
• 119 stars
• 102 double stars
• 94 planetary nebulae
• 84 nebulae
• 50 hII regions
• 43 asterisms
• 24 reflection nebulae
• 19 galaxy pairs
• 9 supernova remnant
• 8 emission nebulae
• 3 galaxy triplets
• 1 non-existent

Overlap with other object catalogs

• 3,174 Principal Galaxies Catalogue
• 3,085 Uppsala General Catalog of galaxies (UGC)
• 321 Collinder catalog
• 222 Melotte catalog
• 193 Markarian galaxies
• 145 Uppsala General Catalog of galaxies addendum (UGCA)
• 103 Messier objects
• 96 Caldwell objects
• 93 PK planetary nebulae
• 89 Arp's catalog of peculiar galaxies
• 86 Strasbourg-ESO Catalogue of Galactic Planetary Nebulae
• 48 Lynds' catalogue of bright nebulae
• 20 Van den Bergh catalogue of reflection nebulae
• 2 Abell catalog of planetary nebulae

Reference

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

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