Messier 50, also known as NGC 2323 or the Heart-shaped Cluster, is an open cluster of stars in the constellation Monoceros. It was recorded by G. D. Cassini before 1711 and independently discovered by Charles Messier in 1772 while observing Biela's Comet. M50 is about 2,900 light-years away from Earth and spans 17.8 light-years. The cluster has 508 confirmed and 109 probable members and their combined mass is more than 285 solar masses.

Caldwell 16, also known as NGC 7243, is an open cluster located 2,300 light years from Earth in the constellation of Lacerta. It was discovered in 1788 by William Herschel, contains an estimated 211 stars and has an angular diameter of about 21 arc minutes. The age of this cluster is estimated at about 250 million years. The cluster is fairly bright, with an apparent magnitude of 6.4 making it visible with the naked eye.

Caldwell 10, also known as NGC 663, is a young open cluster located 8,800 light years from Earth in the constellation of Cassiopeia. It has an estimated 400 stars and spans about a quarter of a degree across the sky. The star cluster is assumed to form part of the stellar association Cassiopeia OB8, that is located in the Perseus Arm of the Milky Way, along with the open clusters M103, NGC 654, NGC 659, and some supergiant stars scattered between them, all of them having similar ages and distances.

Caldwell 8 (NGC 559) is an open cluster in the constellation Cassiopeia. It was discovered by William Herschel on 9 November 1787. About 120 stars populate the cluster, but only about 40 of them are of magnitude 12 or brighter. It is located near the open cluster NGC 637, and the bright magnitude +2.2 irregular variable star Gamma Cassiopeiae. The cluster is 7 arcmins across. The object is also called Ghost's Goblet.

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.