Science, Space and Technology News 2023
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“Previous work has shown that they may be able to. While all being roughly similar sizes, their orbits are distinct. Sedna is an inner Oort Cloud object with a perihelion of 76 AU and aphelion of nearly 1,000 AU, Gonggong is in a very elliptical orbit also, with perihelion of 33 AU and aphelion ~100 AU, and Quaoar is in a relatively circular orbit near 43 AU. These orbits place the bodies in different temperature regimes and different irradiation environments .
“We found abundant ethane on all three bodies, most prominently on Sedna. Sedna also shows acetylene and ethylene . The abundances correlate with the orbit , which is consistent with relative temperatures and irradiation environments. These molecules are direct irradiation products of methane . If ethane had been on the surfaces for a long time, they would have been converted to even more complex molecules by irradiation.
“The primary implication may be finding the size at which KBOs have become warm enough for interior reprocessing of primordial ices, perhaps even differentiation. We should also be able to use these spectra to better understand irradiation processing of surface ices in the outer Solar System. And future studies will also be able to look in more detail at volatile stability and the possibility for atmospheres on these bodies over any parts of their orbits.
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