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Sedna has a V band absolute magnitude of about 1.8, and is estimated to have an albedo (reflectivity) of around 0.41, giving it a diameter of approximately 900 km. [14] At the time of discovery it was the brightest object found in the Solar System since Pluto in 1930.
[9] [19] It was initially estimated to be 300 km (190 mi) in diameter under the assumption of an albedo of 0.15, [5] though observations of a single-chord stellar occultation at Penticton, Canada on 20 October 2018 suggested a smaller diameter of 220 km (140 mi), corresponding to a higher albedo of 0.21.
This list contains a selection of objects 50 and 99 km in radius (100 km to 199 km in average diameter). The listed objects currently include most objects in the asteroid belt and moons of the giant planets in this size range, but many newly discovered objects in the outer Solar System are missing, such as those included in the following ...
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]
The number of dwarf planets in the Solar System is unknown. Estimates have run as high as 200 in the Kuiper belt [1] and over 10,000 in the region beyond. [2] However, consideration of the surprisingly low densities of many large trans-Neptunian objects, as well as spectroscopic analysis of their surfaces, suggests that the number of dwarf planets may be much lower, perhaps only nine among ...
Sedna is currently 88 Astronomical units (AU) from the Sun, which is three times the distance between Neptune and the Sun. Sedna's orbit is an ellipse and its aphelion is estimated to be 937 AU. For most of its orbital period, Sedna is farther from the Sun than any known dwarf planet candidate and most comets. Sedna is one of the reddest ...
The first image compares some of the largest TNOs in terms of size, color and albedo. This is a list of trans-Neptunian objects (TNOs), which are minor planets in the Solar System that orbit the Sun at a greater distance on average than Neptune , that is, their orbit has a semi-major axis greater than 30.1 astronomical units (AU).
The size of 2018 AG 37 is unmeasured, but it likely lies between 400–600 km (250–370 mi) in diameter assuming a geometric albedo range of 0.10–0.25. [20] Sheppard estimates that 2018 AG 37 's diameter lies at the lower end of this range, as he concludes that it has a highly reflective and ice-rich surface. [ 3 ]