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Sedna (minor-planet designation: 90377 Sedna) is a dwarf planet in the outermost reaches of the Solar System, orbiting the Sun beyond the orbit of Neptune.Discovered in 2003, the planetoid's surface is one of the reddest known among Solar System bodies.
One particularly distant body is 90377 Sedna, which was discovered in November 2003.It has an extremely eccentric orbit that takes it to an aphelion of 937 AU. [2] It takes over 10,000 years to orbit, and during the next 50 years it will slowly move closer to the Sun as it comes to perihelion at a distance of 76 AU from the Sun. [3] Sedna is the largest known sednoid, a class of objects that ...
90377: Sedna: 995 ± 80 76.06 506 937 85.1 311.38 2003 (1990) ... about the mass of Pluto and several times the mass of the asteroid belt. ...
For comparison, the semi-major axis of the planetoid 90377 Sedna is about 500 AU. [18] In an extreme case, the scattered-disc object 2014 FE 72 has a semi-major axis around 1,400 AU, [19] though its distance from the Sun as of 2021 is about 64 AU, approximately half 2018 VG 18 's distance from the Sun in that year. [20]
Following the discovery of Leleākūhonua, Sheppard et al. concluded that it implies a population of about 2 million inner Oort cloud objects larger than 40 km (25 mi), with a combined total mass of 1 × 10 22 kg, about the mass of Pluto (a fraction the mass of Earth's moon but several times the mass of the asteroid belt). [5]
When a cruise liner-size asteroid comes within 19,883 miles (32,000 kilometers) of Earth on April 13, 2029, it won’t be alone.
90377 Sedna, a large trans-Neptunian object, had the provisional designation 2003 VB 12, meaning it was identified in the first half of November 2003 (as indicated by the letter "V"), and that it was the 302nd object identified during that time, as 12 cycles of 25 letters give 300, and the letter "B" is the second position in the current cycle.
An asteroid the size of a delivery truck will whip past Earth on Thursday night, one of the closest such encounters ever recorded. NASA insists it will be a near miss with no chance of the ...