Contents within planetarium

• 34 galaxies
• 28 open clusters
• 18 globular clusters
• 13 planetary nebulae
• 7 hII regions
• 6 nebulae
• 1 supernova remnant
• 1 reflection nebula
• 1 dark nebula

Overlap with other object catalogs

• 96 New General Catalogue (NGC)
• 36 Melotte catalog
• 29 Principal Galaxies Catalogue
• 29 Collinder catalog
• 22 Uppsala General Catalog of galaxies (UGC)
• 13 PK planetary nebulae
• 12 Strasbourg-ESO Catalogue of Galactic Planetary Nebulae
• 8 Lynds' catalogue of bright nebulae
• 7 Uppsala General Catalog of galaxies addendum (UGCA)
• 7 Index Catalogue (IC)
• 2 Van den Bergh catalogue of reflection nebulae
• 2 Arp's catalog of peculiar galaxies
• 1 Sharpless catalog
• 1 Markarian galaxies

Reference

• http://astropixels.com/caldwell/caldwellcat.html

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