Search results
Results from the WOW.Com Content Network
Herschel underestimated its diameter at 260 km (160 mi) in 1802; in 1811, German astronomer Johann Hieronymus Schröter overestimated it as 2,613 km (1,624 mi). [25] In the 1970s, infrared photometry enabled more accurate measurements of its albedo, and Ceres's diameter was determined to within ten per cent of its true value of 939 km (583 mi).
It has been calculated that Ceres averages one such cryovolcano every 50 million years. [39] Yamor Mons (previously named Ysolo Mons), near the north pole, has a diameter of 16 km [42] and is the only other Cererian mountain with the shape of Ahuna Mons, though old and battered, the cold temperatures at the pole have preserved its shape. [39]
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.
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 ...
Ceres, at 950 km in diameter, is close to equilibrium, but some deviations from equilibrium shape remain unexplained. [14] Much larger objects, such as Earth's moon and the planet Mercury, are not near hydrostatic equilibrium today, [ 15 ] [ 16 ] [ 17 ] though the Moon is composed primarily of silicate rock and Mercury of metal (in contrast to ...
Diameter (km) Discovered Spacecraft Year(s) Closest approach (km) Closest approach (asteroid radii) Notes Landmark(s) 1 Ceres: 939.4: January 1, 1801: Dawn: 2014–present: 375: 0.80: Dawn took its first "close up" picture of Ceres in December 2014, and entered orbit in March 2015: First likely dwarf planet visited by a spacecraft, largest ...
Ceres [79] and Pluto [80] ... Orcus, Haumea, Makemake, and Gonggong mentions the following symbols for named objects over 600 km diameter ... but also on the distance ...
Dawn image of Ceres from 13,600 km, May 4, 2015. Ceres comprises a third of the total mass of the asteroid belt. ... distance (km) diameter (px) resolution (km/px ...