Trans-Neptunian object

Quick Facts: Who was Trans-Neptunian object?

Subject:

Trans-Neptunian object

Known for:

Minor planets orbiting the Sun beyond Neptune's average distance.

Verified Source:

2Day Chrono-Wiki & Primary Historical Archives

Origins & Early Life

A trans-Neptunian object (TNO), also written transneptunian object, is any minor planet in the Solar System that orbits the Sun at a greater average distance than Neptune, which has an orbital semi-major axis of 30.1 astronomical units (AU). Typically, TNOs are further divided into the classical and resonant objects of the Kuiper belt, the scattered disc and detached objects with the sednoids being the most distant ones. As of February 2025, the catalog of minor planets contains 1006 numbered and more than 4000 unnumbered TNOs.

Career & Major Achievements

However, nearly 5900 objects with semimajor axis over 30 AU are present in the MPC catalog, with 1009 being numbered. The first trans-Neptunian object to be discovered was Pluto in 1930. It took until 1992 to discover a second trans-Neptunian object orbiting the Sun directly, 15760 Albion.

Enduring Legacy & Impact

The most massive TNO known is Eris, followed by Pluto, Haumea, Makemake, and Gonggong. More than 80 satellites have been discovered in orbit of trans-Neptunian objects. TNOs vary in color and are either grey-blue (BB) or very red (RR), with classes in between (BR and IR).

Chronological Milestones & Life Events

1. 1009: 1009 Milestone — However, nearly 5900 objects with semimajor axis over 30 AU are present in the MPC catalog, with 1009 being numbered.
2. 1930: 1930 Milestone — The first trans-Neptunian object to be discovered was Pluto in 1930.
3. 1992: 1992 Milestone — It took until 1992 to discover a second trans-Neptunian object orbiting the Sun directly, 15760 Albion.
4. 2025: 2025 Milestone — As of February 2025, the catalog of minor planets contains 1006 numbered and more than 4000 unnumbered TNOs.

Historical Fact-Check Quiz: Trans-Neptunian object

True or False: “Trans-Neptunian Objects are thought to be composed of mixtures of rock, amorphous carbon, and volatile ices.”

Answer (TRUE ⭕): This composition reflects the materials available in the cold, outer regions of the early Solar System, preserving evidence of the nebula's chemical diversity.

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Frequently Asked Questions about Trans-Neptunian object