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An extreme trans-Neptunian object (ETNO) is a minor planet and trans-Neptunian object, orbiting the Sun well beyond Neptune (30 AU) in the outermost region of the Solar System. An ETNO has a large semi-major axis of at least 150–250 AU. Its orbit is much less affected by the known giant planets than all other known trans-Neptunian objects. They may, however, be influenced by gravitational interactions with a hypothetical Planet Nine, shepherding these objects into similar types of orbits.

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  • Extreme trans-Neptunian object
  • Objet transneptunien extrême
  • Objeto transnetuniano extremo
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  • Un objet transneptunien extrême (en abrégé OTNE ; en anglais extreme trans-Neptunian object, ETNO) ou sednito (à ne pas confondre avec sednoïde) est un objet transneptunien dont le périhélie est supérieur à trente unités astronomiques (q > 30 ua) et le demi-grand axe est supérieur à cent cinquante unités astronomiques (a > 150 ua).
  • Um objeto transnetuniano extremo, ou sednito é um objeto transnetuniano cuja periélio é maior do que trinta unidades astronômicas e o semieixo maior é superior a cento e cinquenta unidades astronômicas.
  • An extreme trans-Neptunian object (ETNO) is a minor planet and trans-Neptunian object, orbiting the Sun well beyond Neptune (30 AU) in the outermost region of the Solar System. An ETNO has a large semi-major axis of at least 150–250 AU. Its orbit is much less affected by the known giant planets than all other known trans-Neptunian objects. They may, however, be influenced by gravitational interactions with a hypothetical Planet Nine, shepherding these objects into similar types of orbits.
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  • Orbits of extreme trans-Neptunian objects and Planet Nine
  • Close up of extreme trans-Neptunian objects' and planets' orbits
  • The orbits of the extreme trans-Neptunian objects are shown in various colours, with Planet Nine's orbit shown in bright green. Most of the orbits are aligned to the right of Planet Nine.
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  • Close up view of 13 TNO current positions
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  • The extreme trans-Neptunian object orbits
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  • Extreme transneptunian object orbits.png
  • Planet_nine-etnos_now-close-new.png
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  • Un objet transneptunien extrême (en abrégé OTNE ; en anglais extreme trans-Neptunian object, ETNO) ou sednito (à ne pas confondre avec sednoïde) est un objet transneptunien dont le périhélie est supérieur à trente unités astronomiques (q > 30 ua) et le demi-grand axe est supérieur à cent cinquante unités astronomiques (a > 150 ua).
  • Um objeto transnetuniano extremo, ou sednito é um objeto transnetuniano cuja periélio é maior do que trinta unidades astronômicas e o semieixo maior é superior a cento e cinquenta unidades astronômicas.
  • An extreme trans-Neptunian object (ETNO) is a minor planet and trans-Neptunian object, orbiting the Sun well beyond Neptune (30 AU) in the outermost region of the Solar System. An ETNO has a large semi-major axis of at least 150–250 AU. Its orbit is much less affected by the known giant planets than all other known trans-Neptunian objects. They may, however, be influenced by gravitational interactions with a hypothetical Planet Nine, shepherding these objects into similar types of orbits. ETNOs can be divided into three different subgroups. The scattered ETNOs (or extreme scattered disc objects, ESDOs) have perihelia around 38–45 AU and an exceptionally high eccentricity of more than 0.85. As with the regular scattered disc objects, they were likely formed as result of gravitational scattering by Neptune and still interact with the giant planets. The detached ETNOs (or extreme detached disc objects, EDDOs), with perihelia approximately between 40–45 and 50–60 AU, are less affected by Neptune than the scattered ETNOS, but are still relatively close to Neptune. The sednoid or inner Oort cloud objects, with perihelia beyond 50–60 AU, are too far from Neptune to be strongly influenced by it.
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