Haumea May Not Be A Dwarf Planet, But Certainly Has A Ring

The family of ringed bodies in the solar system has a new member: Haumea. The dwarf planet with an orbit farther than Pluto’s has been found to have at least one ring, scientists announced in a paper Wednesday.

Haumea, named after the Hawaiian goddess of childbirth, was discovered in 2004 and lies over 43 times farther away from the sun than the sun-Earth distance of about 150 million kilometers (almost 93 million miles). On Jan. 21, the Kuiper belt object was observed during a stellar occultation — a term to refer to a planetary body passing in front of a star, allowing it to be studied by astronomers using ground-based telescopes on Earth.

A large number of telescopes across Europe observed Haumea’s stellar occultation, and analysis of the data collected at the time showed the dwarf planet has a ring that is 70 kilometers wide and has a radius of about 2,287 kilometers, and it is in the same plane as Haumea’s equator. For every three rotations the parent body completes around its axis, the ring completes one revolution around it, the team of European astronomers reported in the paper.

An artist’s illustration showing dwarf planet Haumea with its newly discovered ring. Photo: IAA-CSIC/UHU

This discovery makes Haumea the seventh known body in the solar system that has a ring around itself, but only the first of its kind beyond the orbit of Neptune. Other than the outer four giant planets, two Centaurs — Chiron and Chariklo — also have rings.

The Planetary Society, a nonprofit co-founded by Carl Sagan to promote astronomy and space exploration, partially funded some of the telescopes that were used to study Haumea, and in a statement Wednesday it said the rings were similar to those of Uranus and Neptune.

Further, the team also deduced the elliptical body’s dimensions. Along its longest side, Haumea is at least 2,322 kilometers, while the other two sides are about 1,704 kilometers and 1,138 kilometers. Given its mass of about a third of Pluto’s,…

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