High Quality Content by WIKIPEDIA articles! 10 Hygiea is an
asteroid located in the main asteroid belt. With somewhat oblong
diameters of 350-500 km, and a mass estimated to be 2.9% of the
total mass of the belt, it is the fourth largest object in the
region by volume and mass. It is the largest of the class of dark
itype asteroids with a carbonaceous surface. Although it is the
largest body in its region, due to its dark surface and larger than
average distance from the Sun, it appears very dim when observed
from Earth. For this reason several smaller asteroids were observed
before Annibale de Gasparis discovered Hygiea on April 12, 1849. At
most oppositions, Hygiea has a magnitude which is four orders
fainter than Vesta, and observing it will require at least a 100 mm
telescope, while at a perihelic opposition, it may be observable
with 10x50 binoculars.
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