Sayh al Uhaymir 169

Sayh al Uhaymir 169 or shortly SaU 169 is a lunar meteorite that was discovered on 16 January 2002 by Berner scientists led by Edwin Gnos in the desert of Oman and then explored. It was named after its place of discovery and is the first meteorite for which the exact origin could be determined on its parent body.

The meteorite is 70 × 43 × 40 mm and 208 grams. Inside, he is greenish gray with a dark surface and various Regolitheinschlüssen. With the geochemical composition of the meteorite was found. SaU 169 is unusually rich in the elements uranium and thorium, and thus the radioaktivste of all known meteorites.

Due to the regional distribution of various elements on the moon, as measured by the lunar probes Clementine and Lunar Prospector, as well as the temporal layout and compare with the lunar surface, its origin could be determined exactly. He comes from the area of the crater Lalande presumably for a 3-km wide 70 km north-northeast of Lalande crater located.

SaU 169 was born before 3909 ± 13 million years ago in the region of Mare Imbrium on the Earth's moon and was later hit by three further strikes against 2.8 billion, 200 million and 340,000 years. In the last strike he was hurled into space and captured by the gravity of the earth. Some 10,000 years ago, he crashed in the area of ​​today's Oman to the earth.

Of special scientific importance SaU is 169, since it allows a more precise dating of the Mare Imbrium time.