TRANS-NEPTUNIAN OBJECT Definition & Meaning

trans-Neptunian object

or trans·nep·tu·ni·an ob·ject

[ trans-nep-too-nee-uhn ob-jikt, ‐j��, ‐-tyoo‐, tranz ]

Phonetic (Standard)IPA

noun

Astronomy.

any celestial object in our solar system whose orbit lies beyond Neptune, including Pluto: there may be some 70,000 trans-Neptunian objects orbiting 30–50 astronomical units from the sun, with diameters of at least 62 miles (100 km). : TNO

trans-Neptunian object

/ �ٰ�ă�Բ�′nĕ��-�ٴ�̅��̅��′ŧ-ə�� /

A celestial object that orbits the sun at a greater distance on average than Neptune.

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�y��vlog History and Origins

Origin of trans-Neptunian object¹

First recorded in 1920–25

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Example Sentences

Examples have not been reviewed.

One object, 2013 FY27, is the ninth-brightest trans-Neptunian object known, and at roughly 760 kilometres across is among the largest objects in the outer Solar System.

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