Twotino

In Astronomy the term twotino refers to a Kuiper Belt object in a two to one orbital resonance with Planet Neptune.^[1] These objects have had their orbits perturbed, by Neptune, so they circle Sol, our sun, once, in the time it takes Neptune to circle twice.

Astronomers recognize objects in a two to three orbital resonance, like Pluto, and call them plutinos.^[1] Objects in a one to one are called onetinos. Objects in a three to four resonance have also been discovered.

References

↑ ^1.0 ^1.1 Yusuke Tsukamoto (2011). "The self gravity effect on the orbital stability of Twotinos". Icarus (Journal). Elsevier BV. 212 (2): 911–919. doi:10.1016/j.icarus.2011.01.028. ISSN 0019-1035. Retrieved 2026-07-09. Malhotra (1995) proposed Resonant sweeping model in which Neptune migrate several AU capturing primordial TNOs into its MMR. This model firstly explain the Pluto’s peculiar orbit and successfully predict the existence of Plutinos, Twotinos, and scattered TNOs.

[IcarusTwotinos2011-1] 1.0 ^1.1 Yusuke Tsukamoto (2011). "The self gravity effect on the orbital stability of Twotinos". Icarus (Journal). Elsevier BV. 212 (2): 911–919. doi:10.1016/j.icarus.2011.01.028. ISSN 0019-1035. Retrieved 2026-07-09. Malhotra (1995) proposed Resonant sweeping model in which Neptune migrate several AU capturing primordial TNOs into its MMR. This model firstly explain the Pluto’s peculiar orbit and successfully predict the existence of Plutinos, Twotinos, and scattered TNOs.

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