The orbit of Sedna (a dwarf moon, satellite, minor-planet) shows that at the edge of the solar system (approximately 500 astrounits) there is a large planet comparable in size to Uranus or even larger . On this (official) image - Sedna's orbit (red) compared to the orbits of Jupiter (orange), Saturn (yellow), Uranus (green), Neptune (blue), and Pluto (purple). Sedna (minor-planet designation: 90377 Sedna) is a dwarf planet in the outermost reaches of the Solar System, orbiting the Sun far beyond the orbit of Neptune. Discovered in 2003, the frigid planetoid is one of the reddest known among Solar System bodies. Detailed spectroscopic analysis has revealed Sedna's surface to be a mixture of the solid ices of water (H2O), carbon dioxide (CO2), and ethane (C2H6), along with occasional sedimentary deposits of methane (CH4)-derived, vividly reddish-colored organic tholins, a surface chemical makeup somewhat similar to those of other trans-Neptunian objects. Sedna has the longest orbital period of any known large object in the Solar System, approximately 11,487 years (estimates of 10,836 years and 11,664 years have also been suggested). Sedna's orbital semi-major axis is a = 509.1 AU, and the orbit itself is highly elongated, with an eccentricity of e = 0.8506.
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The orbit of Sedna (a dwarf moon, satellite, minor-planet) shows that at the edge of the solar system (approximately 500 astrounits) there is a large planet comparable in size to Uranus or even larger . On this (official) image - Sedna's orbit (red) compared to the orbits of Jupiter (orange), Saturn (yellow), Uranus (green), Neptune (blue), and Pluto (purple). Sedna (minor-planet designation: 90377 Sedna) is a dwarf planet in the outermost reaches of the Solar System, orbiting the Sun far beyond the orbit of Neptune. Discovered in 2003, the frigid planetoid is one of the reddest known among Solar System bodies. Detailed spectroscopic analysis has revealed Sedna's surface to be a mixture of the solid ices of water (H2O), carbon dioxide (CO2), and ethane (C2H6), along with occasional sedimentary deposits of methane (CH4)-derived, vividly reddish-colored organic tholins, a surface chemical makeup somewhat similar to those of other trans-Neptunian objects. Sedna has the longest orbital period of any known large object in the Solar System, approximately 11,487 years (estimates of 10,836 years and 11,664 years have also been suggested). Sedna's orbital semi-major axis is a = 509.1 AU, and the orbit itself is highly elongated, with an eccentricity of e = 0.8506.
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