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Mature and Fresh Surfaces on the Newborn Asteroid Karin
Here we report a near-infrared (J, H, and K bands) spectroscopy of 832Karin, the brightest asteroid among the Karin cluster group, which isthought to be the remnants of a collisional breakup only 5.8 millionyears ago. The spectroscopic observation was performed by the Subarutelescope with the Cooled Infrared Spectrograph and Camera for OHS on2003 September 14. For different rotational phases of Karin, we deriveddifferent spectra such as a reddened spectrum like that of an S-typeasteroid and an unreddened spectrum like that of ordinary chondrite.Karin could be an impact fragment preserving an old surface and isprobably one of the cone-shaped fragments at the low-velocity impactthat formed the Karin cluster group. Our result supports the idea thatS-type asteroids are parent bodies of ordinary chondrites.
| Objective-Prism Spectrograms of Comet Humason (1961 e)
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