Trans-Neptunian Object (TNO)

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200 TRansneptunian Objects (Harvard-Smithsonian Center for Astrophysics)
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Trans-Neptunian Object (TNO) is any minor planet in the Solar System that orbits the Sun at a greater average distance (semi-major axis) than Neptune, 30 astronomical units (AU). Twelve minor planets with a semi-major axis greater than 150 AU and perihelion greater than 30 AU are known, which are called extreme trans-Neptunian objects (ETNOs).

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. As of February 2017 over 2,300 trans-Neptunian objects appear on the Minor Planet Center’s List of Transneptunian Objects. Of these TNOs, 2,000 have a perihelion farther out than Neptune (30.1 AU).

The most massive known trans-Neptunian object is Eris, followed by Pluto, 2007 OR10, Makemake and Haumea. The Kuiper belt, scattered disk, and Oort cloud are three conventional divisions of this volume of space, though treatments vary and a few objects such as Sedna do not fit easily into any division. — Wikipedia

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Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • Planet Nine could be a primordial black hole, new...
    on September 30, 2019 at 2:00 pm

    The hypothetical Planet Nine, assumed to be lurking somewhere in the outskirts of our solar system, may not be a planet at all. A new study, published September 24 on the arXiv pre-print server, suggests that the mysterious and still undiscovered object might be a primordial black hole.

  • Research team studies binaries to make heads or...
    on June 25, 2019 at 3:28 pm

    A Southwest Research Institute-led team studied the orientation of distant solar system bodies to bolster the "streaming instability" theory of planet formation.

  • Study shows how icy outer solar system satellites...
    on June 25, 2019 at 1:37 pm

    Using sophisticated computer simulations and observations, a team led by researchers from the Earth-Life Science Institute (ELSI) at Tokyo Institute of Technology has shown how the so-called trans-Neptunian objects (or TNOs) may have formed. TNOs, which include the dwarf planet Pluto, are a group of icy and rocky small bodies—smaller than planets, but larger than comets—that orbit the solar system beyond the planet Neptune. TNOs likely formed at the same time as the solar system, […]

  • Neptune's moon Triton fosters rare icy union
    on May 22, 2019 at 7:00 pm

    Astronomers using the Gemini Observatory explore Neptune's largest moon Triton and observe, for the first time beyond the lab, an extraordinary union between carbon monoxide and nitrogen ices. The discovery offers insights into how this volatile mixture can transport material across the moon's surface via geysers, trigger seasonal atmospheric changes, and provide a context for conditions on other distant, icy worlds.

  • Rosetta's comet sculpted by stress
    on February 19, 2019 at 12:08 pm

    Feeling stressed? You're not alone. ESA's Rosetta mission has revealed that geological stress arising from the shape of Comet 67P/Churyumov–Gerasimenko has been a key process in sculpting the comet's surface and interior following its formation.

  • Mystery orbits in outermost reaches of solar...
    on January 21, 2019 at 9:40 am

    The strange orbits of some objects in the farthest reaches of our solar system, hypothesised by some astronomers to be shaped by an unknown ninth planet, can instead be explained by the combined gravitational force of small objects orbiting the Sun beyond Neptune, say researchers.

  • Odd bodies, rapid spins keep cosmic rings close
    on November 19, 2018 at 5:27 pm

    Forget those shepherding moons. Gravity and the odd shapes of asteroid Chariklo and dwarf planet Haumea—small objects deep in our solar system—can be credited for forming and maintaining their own rings, according new research in Nature Astronomy.

  • The threat of centaur solar system objects for...
    on October 10, 2018 at 11:48 am

    Astrophysicists Mattia Galiazzo and Rudolf Dvorak from the University of Vienna, in collaboration with Elizabeth A. Silber (Brown University, U.S.) investigated the long-term path development of centaurs, solar system minor bodies that originally have orbits between Jupiter and Neptune. The researchers have estimated the number of close encounters and impacts with the terrestrial planets after the so-called Late Heavy Bombardment about 3.8 billion years ago, as well as the possible sizes of […]

  • New extremely distant solar system object found...
    on October 2, 2018 at 3:00 pm

    Carnegie's Scott Sheppard and his colleagues—Northern Arizona University's Chad Trujillo, and the University of Hawaii's David Tholen—are once again redefining our Solar System's edge. They discovered a new extremely distant object far beyond Pluto with an orbit that supports the presence of an even-farther-out, Super-Earth or larger Planet X.

  • Oort clouds around other stars should be visible...
    on August 16, 2018 at 3:52 pm

    For decades, scientists have theorized that beyond the edge of the solar system, at a distance of up to 50,000 AU (0.79 ly) from the sun, there lies a massive cloud of icy planetesimals known as the Oort Cloud. Named in honor of Dutch astronomer Jan Oort, this cloud is believed to be where long-term comets originate from. However, to date, no direct evidence has been provided to confirm the Oort Cloud's existence.


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    M.P.E.C. 2019-L53 Issued 2019 June 5, 11:31 UT The Minor Planet Electronic Circulars contain information on unusual minor planets and routine data on comets. They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. Prepared using the Tamkin Foundation Computer Network […]

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    M.P.E.C. 2019-K87 Issued 2019 May 31, 02:33 UT The Minor Planet Electronic Circulars contain information on unusual minor planets and routine data on comets. They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. Prepared using the Tamkin Foundation Computer Network […]

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    M.P.E.C. 2019-K85 Issued 2019 May 31, 02:23 UT The Minor Planet Electronic Circulars contain information on unusual minor planets and routine data on comets. They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. Prepared using the Tamkin Foundation Computer Network […]

  • 37 NEW DISTANT OBJECTS
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  • SEVEN NEW DISTANT OBJECTS
    by Gareth V. Williams on May 5, 2019 at 4:11 am

    M.P.E.C. 2019-J52 Issued 2019 May 5, 04:09 UT The Minor Planet Electronic Circulars contain information on unusual minor planets and routine data on comets. They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. Prepared using the Tamkin Foundation Computer Network […]

  • ELEVEN NEW DISTANT OBJECTS
    by Gareth V. Williams on April 30, 2019 at 4:50 pm

    M.P.E.C. 2019-H116 Issued 2019 Apr. 30, 16:48 UT The Minor Planet Electronic Circulars contain information on unusual minor planets and routine data on comets. They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. Prepared using the Tamkin Foundation Computer Network […]

  • ELEVEN NEW DISTANT OBJECTS
    by Gareth V. Williams on April 30, 2019 at 2:52 pm

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  • 2016 TY94
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    M.P.E.C. 2019-H113 Issued 2019 Apr. 30, 03:06 UT The Minor Planet Electronic Circulars contain information on unusual minor planets and routine data on comets. They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. Prepared using the Tamkin Foundation Computer Network […]