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The Canada-France Ecliptic Plane Survey discovered four trans-Neptunianobjects with semi-major axes near the 5:1 resonance, revealing a large andpreviously undetected intrinsic population. Three of these objects arecurrently resonant with Neptune, and the fourth is consistent with being anobject that escaped the resonance at some point in the past. The non-resonantobject may be representative of a detached population that is stable atslightly lower semi-major axes than the 5:1 resonance. We generated clones ofthese objects by resampling the astrometric uncertainty and examined theirbehavior over a 4.5 Gyr numerical simulation. The majority of the clones of thethree resonant objects (>90%) spend a total of 10^7 years in resonance duringtheir 4.5 Gyr integrations; most clones experience multiple periods ofresonance capture. Our dynamical integrations reveal an exchange between the5:1 resonance, the scattering objects, and other large semi-major axisresonances, especially the 4:1, 6:1, and 7:1. The multiple capture events andrelatively short resonance lifetimes after capture suggest that these objectsare captured scattering objects that stick in the 5:1 resonance. These 5:1resonators may be representative of a temporary population, requiring regularcontributions from a source population. We examined the dynamicalcharacteristics (inclination, eccentricity, resonant island, librationamplitude) of the detected objects and their clones in order to provide anempirical model of the orbit structure of the 5:1 resonance. This resonance isdynamically hot and includes primarily symmetric librators. Given our orbitmodel, the intrinsic population necessary for the detection of these threeobjects in the 5:1 resonance is 1900(+3300 -1400, 95% confidence) with H_g< 8and e > 0.5.

The 5:1 Neptune Resonance as Probed by CFEPS: Dynamics and Population