The ornamental design for a ceilingpanel, as shown and described.
FIG. 1 is a top plan view of a ceiling panel showing our new design;
FIG. 2 is a perspective view thereof;
FIG. 3 is a side elevation view, with the opposing side elevation view being a mirror image thereof;
FIG. 4 is a front elevation view, with the rear elevation view being a mirror image thereof;
FIG. 5 is a perspective view of the ceiling panel shown in FIGS. 1-4. The broken lines showing suspension hardware and like ceiling panels for the purpose of illustrating the environment only and forming no part of the claimed design; and,
FIG. 6 is a top plan view of FIG. 5. The broken lines showing suspension hardware and like ceiling panels for the purpose of illustrating the environment only and forming no part of the claimed design.