  Hubble Space Telescope archive data are used to perform photometry of stars
in seven fields at the center and periphery of the galaxy NGC2366. The
variation of the number density of stars of various ages with galactocentric
radius and along the minor axis of the galaxy are determined. The boundaries of
the thin and thick disks of the galaxy are found. The inferred sizes of the
subsystems of NGC2366 ($Z_{thin} = 4$ kpc and $Z_{thick} = 8$ kpc for the thin
and thick disks, respectively) are more typical for spiral galaxies. Evidence
for a stellar halo is found at the periphery of NGC2366 beyond the thick disk
of the galaxy.

Astrophysics