It is possible because the motion of a test particle in a rotating barred galaxy
model is given by a Hamiltonian function.
NGC 4448 is a bright, barred galaxy
with an inner ring structure that may be visible in very-large-aperture telescopes (8- to 10-inch scopes will reveal a glowing oval, with features faintly articulated), while NGC 4393 is a large, low surface brightness spiral with very faint, nebulous knots scattered across its spiral arms.
But shift you gaze westward close to the Virgo consteallation boundary to get a closer view of the barred galaxy
First glimpses of the "leftovers" of this meal were obtained thanks to observations with the ESA Infrared Space Observatory, which revealed a 16,500 light-year-wide structure, very similar to that of a small barred galaxy
The barred galaxy
NCC 6654 dwells 30' north-northeast of Chi Draconis.