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A radar survey of M- and X-class asteroids. III. Insights into their composition, hydration state, & structure

Nolan, Michael C.; Springmann, Alessondra; Howell, Ellen S. +13 more

Using the S-band radar at Arecibo Observatory, we observed thirteen X/M-class asteroids; nine were previously undetected and four were re-observed, bringing the total number of Tholen X/M-class asteroids observed with radar to 29. Of these 29M-class asteroids, 13 are also W-class, defined as M-class objects that also display a 3-µm absorptio…

Activity of Comet C/2006 W3 Christensen

Kossacki, Konrad J.; Szutowicz, Slawomira

Emission of volatiles for the long-period Comet C/2006 W3 Christensen was observed before perihelion from 3.7 AU through perihelion passage at 3.13 AU till 5.0 AU after perihelion. Coma is found to be strongly enriched in molecules more volatile than water. At heliocentric distances 3.13-3.7 AU activity of the comet was mostly driven by CO emissio…