Caldwell 63, also known as NGC 7293 or the Helix Nebula, is a planetary nebula (PN) located in the constellation Aquarius. Discovered by Karl Ludwig Harding, most likely before 1824, this object is one of the closest of all the bright planetary nebulae to Earth. The distance, measured by the Gaia mission, is 655±13 light-years. Its age is estimated to be 10600 years. It is similar in appearance to the Cat's Eye Nebula and the Ring Nebula.

Caldwell 15, also known as NGC 6826 is a planetary nebula located in the constellation Cygnus. It is commonly referred to as the "Blinking Planetary". A distinctive feature of this nebula are the two bright patches on either side, which are known as Fast Low-Ionization Emission Regions, or FLIERS. They appear to be relatively young, moving outwards at supersonic speeds. Caldwell 15 is located at approximately 2000 lightyears from Earth.