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In 2004, the discoverers placed an upper limit of 1,800 km on its diameter; [45] after observations by the Spitzer Space Telescope, this was revised downward by 2007 to less than 1,600 km. [46] In 2012, measurements from the Herschel Space Observatory suggested that Sedna's diameter was 995 ± 80 km, which would make it smaller than Pluto's ...
Download as PDF; Printable version ... end in the letter q to distinguish the group—hence the name Sedna was changed ... to be 39.3 km (24.4 mi) in diameter. [6]
Vesta (radius 262.7 ± 0.1 km), the second-largest asteroid, appears to have a differentiated interior and therefore likely was once a dwarf planet, but it is no longer very round today. [74] Pallas (radius 255.5 ± 2 km ), the third-largest asteroid, appears never to have completed differentiation and likewise has an irregular shape.
As of September 13, 2019, Brown's list identifies ten trans-Neptunian objects with diameters then thought to be greater than 900 km (the four named by the IAU plus Gonggong, Quaoar, Sedna, Orcus, (307261) 2002 MS 4, and Salacia) as "near certain" to be dwarf planets, and another 16, with diameter greater than 600 km, as "highly likely". [66]
Download as PDF; Printable version ... population of objects roughly Sedna's diameter yet to be observed ... and have a dwarf planet-sized diameter of 220 to 880 km.
Download as PDF; Printable version; ... (estimated to be from 1.7x10 21 to 6.1×10 21 kg for Sedna ... (100 km to 199 km in average diameter).
A 2021 occultation of 2004 XR 190 ("Buffy") found a chord of 560 km: if the body is approximately spherical, it is likely that the diameter is greater than 560 km, but if it is elongated, the mean diameter may well be less. Explanations and sources for the measured masses and diameters can be found in the corresponding articles linked in column ...
Download as PDF; Printable version; In other projects ... Diameter (km) Perihelion (AU) ... Their search recovered known objects like Sedna and produced 17 new outer ...