Shelter Island meteorite was found on Mars by the Opportunity rover on October 1, 2009.

It is about 27 centimetres (11 in) long.

[4] Shelter Island was the second of three iron meteorites encountered by the rover on Meridiani Planum within a few hundred meters, the others being Block Island and Mackinac Island.

[1] Shelter Island may have fallen on Mars in the late Noachian period and is extensively weathered.

[1][3]