1155 Aënna is a main belt asteroid orbiting the Sun

Sun

The Sun is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma interwoven with magnetic fields...

. Approximately 12 kilometers in diameter, it makes a revolution around the Sun once every 4 years. It was discovered by Karl Wilhelm Reinmuth

Karl Wilhelm Reinmuth

Karl Wilhelm Reinmuth was a German astronomer.He was a prolific discoverer of asteroids , beginning with 796 Sarita in 1914, working at the Landessternwarte Heidelberg-Königstuhl astronomical observatory on the Königstuhl hill above Heidelberg, Germany from 1912 to 1957.His most notable...

 at Heidelberg

Landessternwarte Heidelberg-Königstuhl

The Heidelberg-Königstuhl State Observatory is an historic astronomical observatory located near the summit of the Königstuhl hill in the city of Heidelberg in Germany...

, Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

 on January 26, 1928. The name contains the German

German language

German is a West Germanic language, related to and classified alongside English and Dutch. With an estimated 90 – 98 million native speakers, German is one of the world's major languages and is the most widely-spoken first language in the European Union....

pronunciation of the initials "A" and "N" followed by the feminine ending, to honor the Astronomische Nachrichten. The name was proposed by the Astronomisches Rechen-Institut. The provisional designation for the asteroid was 1928 BD.