Caldwell 1, also known as NGC 188 or the Polarissima Cluster, is an open cluster in the constellation Cepheus. It was discovered by John Herschel in 1825. Unlike most open clusters, NGC 188 lies far above the plane of the galaxy and is one of the most ancient of open clusters known, at approximately 6.8 billion years old.

Messier 75 is a globular cluster in the constellation Sagittarius. It was discovered by Pierre Méchain in 1780 and included in Charles Messier's catalog that same year. M75 is about 67,500 light years away from Earth and is 14,700 light years away from, and on the opposite side of, the Galactic Center. Messier 75 is part of the Gaia Sausage, the hypothesised remains of a dwarf galaxy that merged with the Milky Way.

Messier 72 is a globular cluster in the south west of the constellation of Aquarius. M72 was discovered by astronomer Pierre Méchain in 1780. Charles Messier looked for it 36 days later, and included it in his catalog. The cluster is approximately 55,000 lightyears away from the Sun. It has an estimated combined mass of 168,000 solar masses and is around 9.5 billion years old.

Messier 30 (also known as NGC 7099 or the Jellyfish Cluster) is a globular cluster in the constellation of Capricornus. M30 is centred 27,100 light-years away from Earth and is about 93 light-years across. The estimated age is roughly 12.9 billion years. M30 makes one of the highest density regions in the Milky Way galaxy.