Contents within planetarium

• 40 galaxies
• 30 open clusters
• 29 globular clusters
• 4 planetary nebulae
• 1 supernova remnant
• 1 nebula
• 1 asterism
• 1 double star
• 1 hII region
• 1 nebula
• 1 reflection nebula

Overlap with other object catalogs

• 103 New General Catalogue (NGC)
• 54 Melotte catalog
• 38 Principal Galaxies Catalogue
• 36 Uppsala General Catalog of galaxies (UGC)
• 31 Collinder catalog
• 8 Arp's catalog of peculiar galaxies
• 6 Lynds' catalogue of bright nebulae
• 4 Strasbourg-ESO Catalogue of Galactic Planetary Nebulae
• 4 PK planetary nebulae
• 3 Uppsala General Catalog of galaxies addendum (UGCA)
• 1 Van den Bergh catalogue of reflection nebulae
• 1 Index Catalogue (IC)

Reference

• https://en.wikipedia.org/wiki/List_of_Messier_objects

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