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posted by takyon on Thursday October 12 2017, @10:21AM   Printer-friendly
from the Rings-Past-Uranus dept.

It's not just Saturn and gas giants such as Uranus which have rings in our solar system – as a tiny dwarf planet has just been spotted with its very own.

It's the first dwarf planet beyond Neptune to be spotted with its own ring – and could prove that such rings are not uncommon in the outer solar system.

takyon: Haumea has two known moons as well as this newly discovered ring:

A stellar occultation observed on 21 January 2017 indicated the possibility of a ring system around Haumea. As published in Nature on 11 October 2017, this occultation was confirmed to be a ring, representing the first such ring discovered for a TNO. The ring has a radius of about 2,287 km, a width of ~70 km and an opacity of 0.5. The ring plane coincides with Haumea's equator and the orbit of its larger, outer moon Hi'iaka. The ring is close to the 3:1 resonance with Haumea's rotation.

Haumea is known for its extremely elongated shape, a consequence of its rapid rotation.

The size, shape, density and ring of the dwarf planet Haumea from a stellar occultation (DOI: 10.1038/nature24051) (DX)


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  • (Score: 3, Funny) by bob_super on Thursday October 12 2017, @05:11PM (5 children)

    by bob_super (1357) on Thursday October 12 2017, @05:11PM (#581221)

    Knowing astronomers, it would be "Large Planet, Very Large Planet, Extremely Large planet, 30m planet and Overwhelmingly Large Planet [cancelled]"

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  • (Score: 0) by Anonymous Coward on Thursday October 12 2017, @05:55PM (4 children)

    by Anonymous Coward on Thursday October 12 2017, @05:55PM (#581246)

    How about they just make it simple, anything that forms a spherical shape due to it's own gravity is a planet. Yes you can exempt stars and derivatives there-of, but you really don't have to. I know I'm asking for too much, these are the same type of people that call the same thing three different things depending on where it actually is.

    • (Score: 0) by Anonymous Coward on Thursday October 12 2017, @10:23PM (3 children)

      by Anonymous Coward on Thursday October 12 2017, @10:23PM (#581390)

      I like the current definition that says it has to dominate its orbit and clear out any stuff there.

      The International Astronomical Union also specifies that a planet must orbit around only one object (a star).

      .
      I also like the word planetoid for lesser objects.

      .
      it's own gravity

      it's == it is; it has
      its == belongs to it
      A pronoun never needs an apostrophe to make it plural. (its, ours, yours, hers, theirs)

      -- OriginalOwner_ [soylentnews.org]

      • (Score: 2) by bob_super on Friday October 13 2017, @12:47AM (1 child)

        by bob_super (1357) on Friday October 13 2017, @12:47AM (#581463)

        > I like the current definition that says it has to dominate its orbit and clear out any stuff there.

        Almost all major planets have moons and trojans. I don't know why they have a definition that needs extra clarification.

        Is it over 90% round, bigger than a breadbox, orbiting a star with an excentricity below 90%, and any objects orbiting it don't bring that system's center of mass outside of the body? It's a planet.
        KISS.

        • (Score: 0) by Anonymous Coward on Friday October 13 2017, @06:39AM

          by Anonymous Coward on Friday October 13 2017, @06:39AM (#581604)

          Heh. Yeah.

          -- OriginalOwner_ [soylentnews.org]

      • (Score: 1) by toddestan on Saturday October 14 2017, @05:03PM

        by toddestan (4982) on Saturday October 14 2017, @05:03PM (#582334)

        The International Astronomical Union also specifies that a planet must orbit around only one object (a star).

        Actually, not "a star", but "the Sun". So yes, by definition there are only eight planets in the entire universe.