NGC 2403. - As one of the nearer spiral galaxies, this object has received considerable attention from the astronomers at the Hale Observatories. Tammann and Sandage (1968) have examined the stellar content and distance to NGC 2403 and derived a distance modulus of (m - M)₀ = 27.55 ± 0.13. The galaxy is similar to M33 and has broad, ill-defined spiral arms best seen in the Hubble atlas print. Dust clouds are present but not the dominant feature defining the spiral pattern.