Haumea was considered to be in an intermittent 7:12 orbital resonance with Neptune.
Its ascending node  precesses with a period of about 4.6 million years, and the resonance is broken twice per precession cycle, or every 2.3 million years, only to fit a hundred thousand years or so later.
However, Buie later established a different result, qualifying as non-resonant.
Haumea was considered to be in an intermittent 7:12 orbital resonance with Neptune. Its ascending node  precesses with a period of about 4.6 million years, and the resonance is broken twice per precession cycle, or every 2.3 million years, only to fit a hundred thousand years or so later. However, Buie later established a different result, qualifying as non-resonant.
Haumea