  A photometric and astrometric study of the two open star clusters Gulliver 18
and Gulliver 58 was carried out for the first time using the early third data
release of the Gaia space observatory (Gaia-EDR3). By studying the proper
motions, parallaxes, and color-magnitude diagrams of the two clusters, we
determined their actual cluster membership. Therefore, ages, color excesses,
and heliocentric distances of the clusters were determined. The luminosity
function, mass function, total mass, mass segregation, and relaxation time of
Gulliver 18 and Gulliver 58 were estimated as well.
