Park Forest (meteorite)

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Park Forest
Park Forest meteorite, 4g fragment.jpg
Type Chondrite
Class Ordinary chondrite
Group L5
Composition olivine composition Fa24.7, pyroxene Fs20.7Wo1.6
Shock stage S5
Weathering grade W0
Country United States
Region Cook County, Illinois
Coordinates 41°29′5″N 87°40′45″W / 41.48472°N 87.67917°W / 41.48472; -87.67917Coordinates: 41°29′5″N 87°40′45″W / 41.48472°N 87.67917°W / 41.48472; -87.67917
Observed fall Yes
Fall date 2003-03-26
TKW 18 kg
Strewn field Yes
Meteoryt Park Forest.JPG
A small Park Forest fragment

Park Forest is an L5 chondrite meteorite that fell on 26 March 2003 in Illinois, United States.[1]


Around midnight on March 26, 2003, a bright orange fireball was spotted in the sky which was visible across Illinois, Indiana, Wisconsin and Ohio. Soon after, reports of falling debris were recorded near the village of Park Forest Illinois. At least two houses in Park Forest were struck, as well as the Fire Station. In the following days, this event was officially named the Park Forest meteorite, as numerous stones or fragments were recovered in the area. The total mass recovered is above 18 kilograms (40 lb) and the single largest stone is about 3 kilograms (6.6 lb).[2]

Steven Simon (University of Chicago) and seven colleagues from the University of Chicago, the Planetary Studies Foundation, Harper College, Pacific Northwest National Lab, and the Field Museum in Chicago have classified the meteorite fragments that fell on Chicago's southern suburbs on the night of March 26, 2003. Described as:

...the most densely populated region to be hit by a meteorite shower in modern times.[1]

It is estimated that the Park Forest meteoroid was at least 900 kilograms, and as large as 7000 kilograms upon entering the atmosphere.[1]

Composition and classification[edit]

From page A207 of Meteoritics & Planetary Science 38, Nr 7, Supplement, A189–A248 (2003)

Most stones are partly to fully fusion-crusted. Some broken faces show brecciated texture, angular clasts. Cross-cutting dark veins and dark pockets may be of impact melt origin. No visible chondrules in hand sample. Abundant troilite and metal visible in some broken faces. Chondrules and maskelynite are visible in thin section. Mean olivine composition Fa24.7, mean low-Ca pyroxene Fs20.7Wo1.6. Shock stage S5. Specimens: type specimen 515 g (hit fire station), FMNH. Other stones at FMNH: 1200 g, 529 g, 183 g, 159 g, 125 g.[3]


At least twelve samples of this meteorite are conserved within the Robert A. Pritzker Center for Meteoritics and Polar Studies[4] at the Field Museum of Natural History of Chicago. While these specimens are not currently on display, they are available for research purposes through the museum.

It is claimed that a large piece which fell through the kitchen ceiling of one Park Forest couple is periodically displayed at the Adler Planetarium.[citation needed]

See also[edit]


  1. ^ a b c Martel, Linda M.V. "Meteorite Shower in Park Forest, Illinois". PSRD. Planetary Science Research Discoveries. Retrieved 24 September 2015. 
  2. ^ "Park Forest Meteor". The Meteoritical Bulletin. The Meteoritical Society. Retrieved 24 September 2015. 
  3. ^ "The Meteoritical Bulletin" (PDF). Meteoritics & Planetary Science 38, Nr 7, Supplement, A189–A248 (2003). No. 87 (87): A207. 
  4. ^ "The Meteorite Collection". Robert A. Pritzker Center for Meteoritics and Polar Studies. The Field Museum. Retrieved 24 September 2015. 

External links[edit]