1684 Iguassú
Main-belt asteroid
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1684 Iguassú, provisional designation 1951 QE, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 30.5 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, Argentina.[10] It was named after the Iguazu Falls in South America.[2]
| Discovery[1] | |
|---|---|
| Discovered by | M. Itzigsohn |
| Discovery site | La Plata Obs. |
| Discovery date | 23 August 1951 |
| Designations | |
| (1684) Iguassú | |
Named after | Iguazu Falls (South America)[2] |
| 1951 QE · 1934 LN 1935 SK1 · 1939 HK 1949 DE · 1950 JT 1965 AA1 · A922 DA | |
| main-belt · (outer)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 94.75 yr (34,606 days) |
| Aphelion | 3.4852 AU |
| Perihelion | 2.7109 AU |
| 3.0980 AU | |
| Eccentricity | 0.1250 |
| 5.45 yr (1,992 days) | |
| 113.36° | |
| 0° 10m 50.52s / day | |
| Inclination | 3.6665° |
| 105.40° | |
| 154.27° | |
| Physical characteristics | |
| Dimensions | 30.210±0.321[4] 30.5±3.0 km[5] 30.62 km (calculated)[3] 31.381±0.336 km[6] |
| 9.1423±0.0033 h[7] 9.230±0.170 h[8] | |
| 0.057 (assumed)[3] 0.08±0.02[5] 0.0859±0.0064[6] 0.093±0.009[4] | |
| C[3][9] | |
| 10.700±0.140 (R)[8] · 10.8[6] · 10.848±0.001 (R)[7] · 10.90[5] · 10.91±0.21[9] · 11.0[1] · 11.3[3] | |
Orbit and classification
The asteroid orbits the Sun in the outer main-belt at a distance of 2.7â3.5 AU once every 5 years and 5 months (1,992 days). Its orbit has an eccentricity of 0.13 and an inclination of 4° with respect to the ecliptic.[1]
Physical characteristics
Iguassú is characterized as a carbonaceous C-type asteroid.[3][9]
Rotation period
In January 2014, two rotational lightcurves of Iguassú were obtained at the Palomar Transient Factory in California. They gave a rotation period of 9.14 and 9.23 hours, respectively, both with a brightness change of 0.15 in magnitude (U=2/2).[7][8]
Diameter and albedo
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Iguassú measures between 30.21 and 31.38 kilometers in diameter, and its surface has an albedo between 0.08 and 0.093.[4][5][6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 30.62 kilometers based on an absolute magnitude of 11.3.[3]
Naming
This minor planet is named for the large Iguazu Falls, a 60 meters high and 1 kilometer wide waterfall, which river of the same name marks part of the boundary between Argentina and Brazil.[2] 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.[citation needed] The official naming citation was published by the Minor Planet Center on 8 April 1982 (M.P.C. 6832).[11]
