Comet 28P/Neymine: Surface Composition Differs from Asteroids
Despite visual similarities to dark asteroids, Comet 28P/Neymine shows a surface structure with a composition that differs from typical asteroids. The study, using archival images from beyond ten AU, found evidence of a porous structure, which is believed to result from heating and ice sublimation cycles.
A recent study has shown that the surface structure of Comet 28P/Neymine possesses a chemical composition that distinguishes it from typical dark asteroids, despite visual similarities. The analysis was based on archival images of Comet 28P/Neymine, with observations conducted at a distance of more than ten Astronomical Units (AU) from the Sun. The unique opposition effect, which increased the object's brightness, was utilized to improve the analysis.
The examination of the comet nucleus revealed that its color is comparable to that of D-type asteroids. Furthermore, the analysis unveiled other characteristic features: a porous structure was identified. This porous nature is crucial because it structurally distinguishes the comet from ordinary asteroid surfaces; it is hypothesized that this is the result of cycles of heating and ice sublimation. A noticeable increase in brightness also points to characteristics of lighter asteroids. In summary, the study illuminates the comet's unique physical history, which differentiates it from its asteroid-like appearance.