Minor Planets

What shape is the asteroid Juno?

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Science  23 Oct 2015:
Vol. 350, Issue 6259, pp. 395-396
DOI: 10.1126/science.350.6259.395-e

3 Juno was the third asteroid to be discovered. However, no spacecraft has ever been very close to it, so its shape and surface features have remained poorly understood. Viikinkoski et al. have produced a model of Juno's shape by combining constraints from a full array of available data: optical light curves, near-infrared adaptive optics images, submillimeter interferometry, and the occultations of background stars. They find that the asteroid has a distorted lozenge-like shape with evidence of concave features, suggesting impact craters. The shape appears to be intermediate between that of the lumpy irregular smaller bodies and the near-spherical larger asteroids.

Astron. Astrophys. 581, L3 (2015).

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