The Collinder catalogue is a catalogue of 471 open clusters compiled by Swedish astronomer Per Collinder. It was published in 1931 as an appendix to Collinder's paper On structural properties of open galactic clusters and their spatial distribution.
Collinder 399, a prominent asterism in the constellation Vulpecula.
Perseus is a constellation in the northern sky, named after the Greek mythological hero Perseus. It is one of the 48 ancient constellations listed by the 2nd-century astronomer Ptolemy, and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located near several other constellations named after ancient Greek legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west. Some star atlases during the early 19th century also depicted Perseus holding the disembodied head of Medusa, whose asterism was named together as Perseus et Caput Medusae; however, this never came into popular usage.
Perseus carrying the head of Medusa the Gorgon, as depicted in Urania's Mirror, a set of constellation cards published in London c.1825
The constellation Perseus as it can be seen by the naked eye
The Double Cluster (NGC 869 and NGC 884)
NGC 1333, a nebula in the Perseus molecular cloud featuring glowing gases and pitch-black dust stirred up and blown around by several hundred newly forming stars embedded within the dark cloud.