22 Kalliope and satellite Linus are currently the lowest numbered binary asteroid with components of roughly 166km and 28km.

This is an Adaptive optics (AO) image of the binary system taken by the W.M. Keck II telescope in 2010.

Franck Marchis blog: Keck AO Observations: Multiple Asteroid Systems

2010

Franck Marchis and his team using the W. M. Keck Observatory

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If this tag does not accurately describe this image, please replace it with an appropriate one. Fair use true

This image qualifies for fair use in the articles 22 Kalliope, Linus (moon), and List of Solar System objects by size since:

1) Illustrates the significance of the lowest numbered asteroid known to be binary.

2) No freely available alternative to this unique image since Adaptive optics are beyond the means of most telescopes, and thus not easily reproducible.

3) Does not make the work as a whole less valuable to the copyright holder since the image was created for scientific purposes.

For commercial use of this image please contact Keck Observatory at http://keckobservatory.org/contact