980 Anacostia
| Discovery | |
|---|---|
| Discovered by | George Henry Peters |
| Discovery site | Washington, D.C. |
| Discovery date | 21 November 1921 |
| Designations | |
| 1921 W19 | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.01 yr (31782 days) |
| Aphelion | 3.2953 AU (492.97 Gm) |
| Perihelion | 2.1842 AU (326.75 Gm) |
| 2.7397 AU (409.85 Gm) | |
| Eccentricity | 0.20278 |
| 4.53 yr (1656.4 d) | |
| 317.515° | |
| 0° 13m 2.424s / day | |
| Inclination | 15.905° |
| 285.817° | |
| 70.143° | |
| Earth MOID | 1.23398 AU (184.601 Gm) |
| Jupiter MOID | 2.2917 AU (342.83 Gm) |
| Jupiter Tisserand parameter | 3.266 |
| Physical characteristics | |
Mean radius | 43.095±0.8 km |
| 20.117 h (0.8382 d) | |
| 0.1723±0.006 | |
| 7.85 | |
|
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980 Anacostia is a minor planet orbiting the Sun that was discovered by American astronomer George Henry Peters on November 21, 1921.
Measurements using the adaptive optics system at the W. M. Keck Observatory give a diameter of 70 ± 6 km. This is 23% smaller than the diameter estimated from the IRAS observatory data. The size ratio between the major and minor axes is 1.09.[2]
Polarimetric study of this asteroid reveals anomalous properties that suggests the regolith consists of a mixture of low and high albedo material. This may have been caused by fragmentation of an asteroid substrate with the spectral properties of CO3/CV3 carbonaceous chondrites.[3]
References
- ↑ Yeomans, Donald K., "980 Anacostia", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2 May 2016.
- ↑ Marchis, F.; et al. (November 2006), "Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey", Icarus 185 (1), pp. 39–63, Bibcode:2006Icar..185...39M, doi:10.1016/j.icarus.2006.06.001, PMC 2600456, PMID 19081813, retrieved 2013-03-27.
- ↑ Gil-Hutton, R.; et al. (April 2008), "New cases of unusual polarimetric behavior in asteroids", Astronomy and Astrophysics 482 (1), pp. 309–314, Bibcode:2008A&A...482..309G, doi:10.1051/0004-6361:20078965.
External links
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