Open Clusters

The Eagle Nebula is a young open cluster of stars in the constellation of Serpens.

The Beehive Cluster (also known as Praesepe (Latin for "manger", "cot" or "crib"), M44, NGC 2632, or Cr 189) is an open cluster in the constellation Cancer.

The Butterfly Cluster (cataloged as Messier 6 or M6, and as NGC 6405) is an open cluster of stars in the southern constellation of Scorpius.

Messier 7 or M7, also designated NGC 6475 and sometimes known as Ptolemy's Cluster, is an open cluster of stars in the constellation of Scorpius.

The Wild Duck Cluster (also known as Messier 11, or NGC 6705) is an open cluster of stars in the constellation Scutum (the Shield).

The Double Cluster, also known as Caldwell 14, consists of the open clusters NGC 869 and NGC 884 (often designated h Persei and χ (chi) Persei, respectively), which are close together in the constellation Perseus.

The Hyades (; Greek: Ὑάδες; also known as Caldwell 41, Collinder 50, or Melotte 25) is the nearest open cluster and one of the best-studied star clusters.

Messier 18 or M18, also designated NGC 6613 and sometimes known as the Black Swan Cluster, is an open cluster of stars in the constellation Sagittarius.

Messier 21 or M21, also designated NGC 6531 or Webb's Cross, is an open cluster of stars located to the north-east of Sagittarius in the night sky, close to the Messier objects M20 to M25 (except M24).

Messier 23, also known as NGC 6494, is an open cluster of stars in the northwest of the southern constellation of Sagittarius.

Messier 25, also known as IC 4725, is an open cluster of stars in the southern constellation of Sagittarius.

Messier 26, also known as NGC 6694, is an open cluster of stars in the southern constellation of Scutum.

Messier 29 or M29, also known as NGC 6913 or the Cooling Tower Cluster, is a quite small, bright open cluster of stars just south of the central bright star Gamma Cygni of a northerly zone of the sky, Cygnus.

Messier 34 (also known as M34, NGC 1039, or the Spiral Cluster) is a large and relatively near open cluster in Perseus.

Messier 35 or M35, also known as NGC 2168 or the Shoe-Buckle Cluster, is a relatively close open cluster of stars in the west of Gemini, at about the declination of the Sun when the latter is at June solstice.

Messier 36 or M36, also known as NGC 1960 or the Pinwheel Cluster, is an open cluster of stars in the somewhat northern Auriga constellation.

Messier 39 or M39, also known as NGC 7092, is an open cluster of stars in the constellation of Cygnus, sometimes referred to as the Pyramid Cluster.

Messier 41 (also known as M41 or NGC 2287) is an open cluster in the constellation Canis Major.

Messier 46 or M46, also known as NGC 2437, is an open cluster of stars in the slightly southern constellation of Puppis.

Messier 47 (M47 or NGC 2422), also known as NGC 2478 is an open cluster in the southern constellation of Puppis.

Messier 48 or M48, also known as NGC 2548, is an open cluster of stars in the equatorial constellation of Hydra.

Messier 50 or M 50, also known as NGC 2323 or the Heart-shaped Cluster, is an open cluster of stars in the constellation Monoceros.

Messier 52 or M52, also known as NGC 7654 or the Scorpion Cluster, is an open cluster of stars in the highly northern constellation of Cassiopeia.

Messier 37 (also known as M37, NGC 2099, or the Salt and Pepper Cluster) is the brightest and richest open cluster in the constellation Auriga.

Messier 38 or M38, also known as NGC 1912 or Starfish Cluster, is an open cluster of stars in the constellation of Auriga.

Messier 67 (also known as M67 or NGC 2682) and sometimes called the King Cobra Cluster or the Golden Eye Cluster is an open cluster in the southern, equatorial half of Cancer.

Messier 93 or M93, also known as NGC 2447 or the Critter Cluster, is an open cluster in the modestly southern constellation Puppis, the imagined poop deck of the legendary Argo.

Messier 103 (also known as M103, or NGC 581) is a small open cluster of many faint stars in Cassiopeia.

NGC 188 (also known as Caldwell 1 or the Polarissima Cluster) is an open cluster in the constellation Cepheus.

NGC 559 (also known as Caldwell 8) is an open cluster and Caldwell object in the northern constellation of Cassiopeia.

NGC 663 (also known as Caldwell 10) is a young open cluster located 8,800 light years from Earth in the constellation of Cassiopeia.

NGC 457 is an open cluster of stars in the northern constellation of Cassiopeia.

NGC 752 (also known as Caldwell 28) is an open cluster of stars in the constellation Andromeda.

is an open cluster of stars