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1684 Iguassú
1684 Iguassu, provisional designation 1951 QE, is a carbonaceous asteroid from the outer region of the asteroid belt, about 27 kilometers in diameter. It was discovered on 23 August 1951 by Argentine astronomer Miguel Itzigsohn at the La Plata Astronomical Observatory, located in the city of La Plata, capital of province of the Buenos Aires.〔
The asteroid orbits the Sun at a distance of 2.7–3.5 AU once every 5.45 years (1,990 days). Its orbit shows an eccentricity of 0.12 and is tilted by 4 degrees to the plane of the ecliptic. The Lightcurve Database project assumes the body to be a C-type asteroid with a corresponding low albedo of 0.06, while seven older observations by the Infrared Astronomical Satellite, IRAS, gave a much higher value of 0.12.〔
In 2014, two photometric light-curve measurements determined the body's rotation period to be 9.14 and 9.23 hours, respectively, both with a brightness change of in magnitude.〔〔
It is named after the large, 60-meters high and 1-kilometer wide waterfall, the Iguazu Falls, which river of the same name marks part of the boundary between Argentina and Brazil.〔 As a curiosity, the spelling of the minor planet's name ''Iguassú'' neither concurs with the Spanish "Iguazú" nor with the Portuguese "Iguaçu". It is rather similar to "Yguasu", used in the native Guarani language, from which the waterfall's name originates.
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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