1684 Iguassú
| Discovery [1] | |
|---|---|
| Discovered by | M. Itzigsohn |
| Discovery site | La Plata Observatory |
| Discovery date | 23 August 1951 |
| Designations | |
| 1684 Iguassú | |
Named after | Iguazu Falls[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 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 94.08 yr (34362 days) |
| Aphelion | 3.4825 AU (520.97 Gm) |
| Perihelion | 2.7106 AU (405.50 Gm) |
| 3.0966 AU (463.24 Gm) | |
| Eccentricity | 0.12463 |
| 5.45 yr (1990.3 d) | |
| 5.0386° | |
| 0° 10m 51.168s / day | |
| Inclination | 3.6669° |
| 105.41° | |
| 154.12° | |
| Earth MOID | 1.69461 AU (253.510 Gm) |
| Jupiter MOID | 1.57401 AU (235.469 Gm) |
| TJupiter | 3.208 |
| Physical characteristics | |
| Dimensions | 26.53 km 30.62 km (calculated)[3] |
Mean radius | 13.265 ± 0.6 km |
| 9.1423±0.0033 h[4] 9.230±0.170 h[5] 9.1423 h (0.38093 d)[1] | |
| 0.1202 ± 0.011[1] 0.057 (assumed)[3] | |
| C [3] | |
| 10.9[1] | |
1684 Iguassú, 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.[6]
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.[3]
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 0.15 in magnitude.[4][5]
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.[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.
References
- ^ a b c d e "JPL Small-Body Database Browser: 1684 Iguassu (1951 QE)" (2015-09-20 last obs.). Jet Propulsion Laboratory. Retrieved 22 April 2016.
- ^ a b Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1684) Iguassú. Springer Berlin Heidelberg. p. 134. ISBN 978-3-540-29925-7. Retrieved 11 November 2015.
- ^ a b c d e "LCDB Data for (1684) Iguassu". Asteroid Lightcurve Database (LCDB). Retrieved 11 November 2015.
- ^ a b Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 11 November 2015.
- ^ a b Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; Yang, Ting-Chang; et al. (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series. 219 (2): 19. arXiv:1506.08493. Bibcode:2015ApJS..219...27C. doi:10.1088/0067-0049/219/2/27. Retrieved 11 November 2015.
- ^ "1684 Iguassu (1951 QE)". Minor Planet Center. Retrieved 11 November 2015.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1684 Iguassú at the JPL Small-Body Database
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