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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 ...
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.
Mercury, the smallest and innermost planet, has no moons, or at least none that can be detected to a diameter of 1.6 km (1.0 mi). [2] For a very short time in 1974, Mercury was thought to have a moon. Venus also has no moons, [3] though reports of a moon around Venus have circulated since the 17th century.
The planet, with a mass about 1.9 times that of Earth, is orbiting the white dwarf about 4,200 light-years away from our solar system near the bulge at the center of the Milky Way galaxy ...
The subgiant star Pipirima has a higher mass of 9.1 ± 0.3 M ☉, [85] but its planet candidate Mu2 Scorpii b is most likely a brown dwarf having 14.4 ± 0.8 M J. The candidate planet M51-ULS-1b and the candidate planemo IGR J12580+0134 b might be the blanets , whose hosts have masses of ≫10 and 9 150 000 Solar masses, respectively.
The planet Earth has a rather slight equatorial bulge; its equatorial diameter is about 43 km (27 mi) greater than its polar diameter, with a difference of about 1 ⁄ 298 of the equatorial diameter. If Earth were scaled down to a globe with an equatorial diameter of 1 metre (3.3 ft), that difference would be only 3 mm (0.12 in).
By RYAN GORMAN Scientists may have found Planet X -- the long-rumored object believed to be larger than Earth and further from the sun than Pluto. Planet X and another object dubbed "Planet Y ...
In this list the periods are sourced from the Light Curve Data Base (LCDB), [2] and are given in both seconds and hours. Most minor planets have rotation periods between 2 and 20 hours. [ 1 ] [ 3 ] As of 2019 [update] , a group of 887 bodies – most of them are stony near-Earth asteroids with small diameters of barely 1 kilometre – have an ...