| 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 | 3.4852AU |
| Perihelion | 2.7109 AU |
| 3.0980 AU | |
| Eccentricity | 0.1250 |
| 5.45yr (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±0.0033h[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] | |
1684 Iguassú, provisional designation1951 QE, is a carbonaceousasteroid from the outer region of theasteroid belt, approximately 30.5 kilometers in diameter. It was discovered on 23 August 1951, by Argentine astronomerMiguel Itzigsohn at theLa Plata Astronomical Observatory, located in the city of La Plata, Argentina.[10] It was named after theIguazu Falls in South America.[2]
The asteroid orbits the Sun in theouter main-belt at a distance of 2.7–3.5 AU once every 5 years and 5 months (1,992 days). Its orbit has aneccentricity of 0.13 and aninclination of 4° with respect to theecliptic.[1]
Iguassú is characterized as a carbonaceousC-type asteroid.[3][9]
In January 2014, two rotationallightcurves ofIguassú were obtained at thePalomar Transient Factory in California. They gave arotation period of 9.14 and 9.23 hours, respectively, both with a brightness change of0.15 inmagnitude (U=2/2).[7][8]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Iguassú measures between 30.21 and 31.38 kilometers in diameter, and its surface has analbedo between 0.08 and 0.093.[4][5][6] TheCollaborative 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]
Thisminor planet is named for the largeIguazu 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. The official naming citation was published by theMinor Planet Center on 8 April 1982 (M.P.C. 6832).[11]
