NGC 2100 is an open cluster in the Large Magellanic Cloud, a small satellite galaxy of the Milky Way. These clusters have a lifespan measured in tens or hundreds of millions of years, as they eventually disperse through gravitational interaction with other bodies. As its format is approximately round, it is sometimes mistaken as a globular cluster.

NGC 2100
Star cluster NGC 2100 in the Large Magellanic Cloud. Image taken at La Silla observatory. Credit: ESO
Observation data (J2000 epoch)
Right ascension	05h 42m 08s[1]
Declination	−69° 12.7′
Physical characteristics
Estimated age	15 million years old[2]
Other designations	NGC 2100, KMHK 1257, [SL63] 662
Associations
Constellation	Dorado
See also: Open cluster, List of open clusters