127 Johanna
Encyclopedia
127 Johanna is a large main-belt asteroid
Asteroid
Asteroids are a class of small Solar System bodies in orbit around the Sun. They have also been called planetoids, especially the larger ones...

. It has a very dark surface and is probably a primitive composition of carbonate
Carbonate
In chemistry, a carbonate is a salt of carbonic acid, characterized by the presence of the carbonate ion, . The name may also mean an ester of carbonic acid, an organic compound containing the carbonate group C2....

s. It was discovered by P. M. Henry
Paul Henry and Prosper Henry
Paul-Pierre Henry and his brother Mathieu-Prosper Henry were French opticians and astronomers....

 on November 5, 1872, and is believed to be named after Joan of Arc
Joan of Arc
Saint Joan of Arc, nicknamed "The Maid of Orléans" , is a national heroine of France and a Roman Catholic saint. A peasant girl born in eastern France who claimed divine guidance, she led the French army to several important victories during the Hundred Years' War, which paved the way for the...

.
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