Messier 38 (M38), also known as the Starfish Cluster, is an open star cluster located in the northern constellation Auriga. The cluster lies at a distance of 4,200 light years from Earth. With an apparent magnitude of 7.4, it is invisible to the naked eye. M38 has the designation NGC 1912 in the New General Catalogue.
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Messier 37 (M37) is an open cluster in the constellation Auriga. It has the designation NGC 2099 in the New General Catalogue. M37 is the brightest, richest and largest of the three open clusters in this constellation that were catalogued by Messier. It has an apparent magnitude of 6.2 and lies at a distance of 4,511 light years from Earth.
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Messier 36 (M36), also known as the Pinwheel Cluster, is an open cluster located in the northern constellation Auriga, the Charioteer. The cluster occupies an area of 12 arc minutes in the sky, corresponding to a linear extension of 14 light years. It has an apparent magnitude of 6.3 and lies at a distance of 4,100 light years from Earth. M36 has the designation NGC 1960 in the New General Catalogue.
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Messier 35 (M35) is a large open star cluster located in the northern constellation Gemini. The cluster consists of several hundred stars, of which 120 are brighter than magnitude 13. The central region has a density of 6.21 stars per cubic parsec.
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