E. M. Antoniadi

Eugène Michel Antoniadi (Greek: Εὐγένιος Μιχαὴλ Αντωνιάδης; 1 March 1870, Constantinople – 10 February 1944, Paris) was a Greek astronomer, born in Asia Minor, who spent most of his life in France when invited there by Camille Flammarion. He was also known as Eugenios Antoniadis. His name is also sometimes given as Eugène Michael Antoniadi or even (incorrectly) as Eugène Marie Antoniadi.

Antoniadi became a highly reputed observer of Mars, and at first supported the notion of Martian canals, but after using the 83 centimeter telescope at Meudon Observatory during the 1909 opposition of Mars, he came to the conclusion that canals were an optical illusion. He also observed Venus and Mercury. He made the first attempts to draw a map of Mercury, but his maps were flawed by his incorrect assumption that Mercury had synchronous rotation with the Sun. The first standard nomenclature for Martian albedo features was introduced by the International Astronomical Union (IAU) when they adopted 128 names from the 1929 map of Antoniadi named La Planète Mars.

Antoniadi (lunar crater)

Antoniadi is a large lunar impact crater that lies on the southern hemisphere on the far side of the Moon. The crater intrudes into the southeastern rim of the crater Minnaert, a slightly smaller formation that is significantly more eroded. Attached to the eastern rim of Antoniadi is Numerov, another large, ancient crater similar to Minnaert. Due south of Antoniadi is the small crater Brashear.

Geography

The outer rim of Antoniadi is generally circular, with an irregular edge that has multiple indentations all about the perimeter. The wall is only lightly eroded, and retains a crisp rim and terracing on the inner walls. Only a single small craterlet of note lies across the interior wall, near the southeast edge of the rim.

Antoniadi is one of the few craters on the Moon that possesses both a second inner ring and a central peak. This inner ring formation is about half the diameter of the outer wall, and only rugged mountain segments of the ring to the north and south still remain. The western part of the inner ring is almost non-existent, and only a few minor hills remain to the east.

Antoniadi (disambiguation)

Antoniadi may refer to:

Surname

Others

See also