On-sky distribution of the NGC 4490 system in equatorial coordinates centered on the host. Objects are color-coded by their velocity relative to that of NGC 4490, and the two objects without available velocity measurements are shown in yellow. The major axis of the projected distribution is indicated with a dashed black line. The green dotted lines (in 1° increments) indicate the separation lines maximizing the kinematic coherence (all northern objects more blue-shifted, all southern objects more red-shifted than the host). This split maximizing the kinematic coherence aligns well with the distribution’s minor axis (thicker green dotted line), as expected for a rotating, flattened structure, and similar to the M 31 and Centaurus A satellite planes. The likely pair of dwarf galaxies is highlighted by yellow circles.