|Fall date||3 December 1980|
Kaidun is a meteorite that fell on 3 December 1980 on a Soviet military base near what is now Al-Khuraybah in Yemen. A fireball was observed travelling from the northwest to the southeast, and a single stone weighing about 2 kilograms (4.4 lb) was recovered from a small impact pit.
It contains a uniquely wide variety of minerals, causing some confusion as to its origin. It is largely made up of carbonaceous chondrite material of type CR2, but it is known to contain fragments of other types, such as C1, CM1, and C3. Of the nearly 60 minerals found within the meteorite, several have not been found elsewhere in nature, such as florenskyite, which has the chemical formula: FeTiP.
In March 2004 it was suggested that the meteorite originated from the Martian moon Phobos. The reason Phobos has been suggested is the existence of two extremely rare alkaline-rich clasts visible in the meteorite, each of which entered the rock at different times. This suggests that the parent body would have been near a source of an alkaline-rich rock, which is in particular a product of deep differentiation. This points to Mars and one of its moons, and Phobos is more likely than Deimos because it is closer to Mars. However, mineralogical and noble gas work do not tie the lithic fragments to Mars, as has been done with other proven Martian meteorites, and this hypothesized link is tenuous at best. On support to this suggestion, on 2017 it was found by 2 scientists at the Western University that meteorites originated from Phobos (and even Deimos) can arrive to the Earth.
- Meteoritical Bulletin Database: Kaidun
- Ivanov, Andrei V.; Ulyanov, A. A.; Skripnic, A. Y.; Konokona, N. N. (March 1984). "The Kaidun Polymict Carbonaceous Breccia: the Mixture of Incompatible Types of Meteorites". Lunar and Planetary Science. Astrophysics Data System. 15: 393–394. Bibcode:1984LPI....15..393I.
- Hogan, Jenny (22 April 2004). "'Weird' meteorite may be from Mars moon". New Scientist. Retrieved 15 August 2012.
- Ivanov, Andrei V. (March 2004). "Is the Kaidun Meteorite a Sample from Phobos?". Solar System Research. 38 (2): 97–107. Bibcode:2004SoSyR..38...97I. doi:10.1023/B:SOLS.0000022821.22821.84.
- Ivanov, Andrei V. (4 September 2003). "The Kaidun Meteorite: Where Did It Come From?" (PDF). Archived from the original (PDF) on 27 March 2009. Retrieved 20 August 2009.
- Wiegert, P.; Galiazzo, M. (2017). "Meteorites from Phobos and Deimos at Earth?". Planetary and Space Science. 142: 48–52. arXiv:1705.02260. Bibcode:2016Ap&SS.361..212G. doi:10.1016/j.pss.2017.05.001.
- Kaidun: A Meteorite with Everything but the Kitchen Sink, written by Linda M. V. Martel, Hawai‘i Institute of Geophysics and Planetology
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