Outer Solar System Origins Survey

[2] Conducted at the Canada-France-Hawaii telescope at Mauna Kea Observatories (568) in Hawaii, the survey has discovered 39 numbered objects as of 2018,[1] with potentially hundreds more to follow.

[3] This extended period of observation was designed to remove ephemeris bias which can cause the loss of some objects due to inaccurate predictions of their future positions.

Pointing directions, detection efficiencies, and tracking frequencies were determined to allow other observational biases to be identified.

[15] Four scattered disk objects with high perihelia have been detected with semi-major axes smaller than nearby resonances, consistent with their escape during a slow grainy migration of Neptune.

[17] The number of centaurs detected and their inclinantion distribution were consistent with a model of the early Solar System that included a slow, long range migration of Neptune.

Col-OSSOS observes OSSOS objects with red magnitudes brighter than 23.5 simultaneously using the Gemini-North and Canada-France-Hawaii telescopes.

Semimajor axis and eccentricity of objects detected by OSSOS. Six other objects (not shown) with semimajor axes between 160 AU and 800 AU were also detected.
Semimajor axis and inclination of objects detected by OSSOS. Seven other objects (not shown) with semimajor axes between 160 AU and 800 AU or inclinations above 50 degrees were also detected.