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Planet Nine is a hypothetical ninth planet in the outer region of the Solar System. Its gravitational effects could explain the peculiar clustering of orbits for a group of extreme trans-Neptunian objects (ETNOs)—bodies beyond Neptune that orbit the Sun at distances averaging more than 250 times that of the Earth, over 250 astronomical units (AU). These…
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planet nine objects orbits au orbit would perihelion semi-major etnos solar brown system axis batygin also could observed planets inclination
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Planet Nine | Aphelion | 370±30 AU | 1.00 | infobox |
| Planet Nine | Apparent magnitude | ≈21 | 1.00 | infobox |
| Planet Nine | Argument of perihelion | 150° (est.) | 1.00 | infobox |
| Planet Nine | Eccentricity | 0.29±0.13 | 1.00 | infobox |
| Planet Nine | Inclination | 6.8°±5.0° | 1.00 | infobox |
| Planet Nine | Mass | 4.4±1.1 M🜨 | 1.00 | infobox |
| Planet Nine | Orbital period (sidereal) | 4,940+790 −750 yr[A] | 1.00 | infobox |
| Planet Nine | Perihelion | 200±50 AU | 1.00 | infobox |
| Planet Nine | Semi-major axis | 290±30 AU | 1.00 | infobox |
| Planet Nine | is a | hypothetical ninth planet in the outer region of the Solar System | 0.90 | text |
| Planet Nine | is a | only one that explains all four | 0.90 | text |
| Wide-field Infrared Survey Explorer | instance of | or that it formed on a distant orbit and was pulled into an eccentric orbit by a passing star.Although sky surveys | 0.80 | text |
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