| Ourique | |
|---|---|
 | |
| Type | Chondrite |
| Class | Ordinary chondrite |
| Group | H4 |
| Composition | olivine Fa18.3; pyroxene Fs16.4; |
| Country | Portugal |
| Region | Beja |
| Coordinates | 37°36′30″N8°16′48″W / 37.60833°N 8.28000°W Coordinates: 37°36′30″N8°16′48″W / 37.60833°N 8.28000°W [1] |
| Observed fall | Yes |
| Fall date | December 28, 1998 |
| TKW | >20 kg |
Ourique is a H4 meteorite that fell in 1998 in Portugal.
During the night between 27 and 28 December 1998, a brilliant fireball and loud noises were reported by several people in Beja region.
Antonio Silva recovered the first fragments two days after the fall and, subsequently, local villagers recovered other pieces. The meteorite made an elliptical crater 20 centimetres (7.9 in) deep, 60 centimetres (24 in) long and 30 centimetres (12 in) wide. Most of all fragments were found within an elliptical area long 55 metres (180 ft).
It is a H4 type ordinary chondrite with a well-developed chondritic structure. Chemical analysis reported: olivine Fa18.3 and pyroxene Fs16.4.
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A meteorite is a solid piece of debris from an object, such as a comet, asteroid, or meteoroid, that originates in outer space and survives its passage through the atmosphere to reach the surface of a planet or moon. When the original object enters the atmosphere, various factors such as friction, pressure, and chemical interactions with the atmospheric gases cause it to heat up and radiate energy. It then becomes a meteor and forms a fireball, also known as a shooting star; astronomers call the brightest examples "bolides". Once it settles on the larger body's surface, the meteor becomes a meteorite. Meteorites vary greatly in size. For geologists, a bolide is a meteorite large enough to create an impact crater.
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