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Abstract: Abridged Thirty-three objects with possible origins beyond the Kuiper Beltedge, very high inclinations, very large semi-major axes or large periheliondistances were observed to determine their surface colors. All three objectsthat have been dynamically linked to the inner Oort cloud Sedna, 2006 SQ372,and 2000 OO67 were found to have ultra-red surfaces S~25. Ultra-red materialis generally associated with rich organics and the low inclination -cold-classical Kuiper Belt objects. The observations detailed here show very redmaterial may be a more general feature for objects kept far from the Sun. Therecently discovered retrograde outer Solar System objects 2008 KV42 and 2008YB3 and the high inclination object 127546 2002 XU93 show only moderatelyred surfaces S~9, very similar to known comets. The extended or detached diskobjects, which have large perihelion distances and large eccentricities, arefound to have mostly moderately red colors 10 < S < 18. The colors of thedetached disk objects, including the dynamically unusual 2004 XR190 and 2000CR105, are similar to the scattered disk and Plutino populations. Thus thedetached and scattered disk likely have a similar mix of objects from the samesource regions. Outer classical belt objects, including 1995 TL8, were found tohave very red surfaces 18 < S < 30. The -cold- classical belt, outerclassical belt and inner Oort cloud appear to be dominated by ultra-red objectsS > 25 and thus don-t likely have a similar mix of objects as the scattereddisk, detached disk and Trojan populations. A possible trend was found for thedetached disk and outer classical belt in that objects with smallereccentricities have redder surfaces irrespective of inclinations or periheliondistances. There is also a clear trend that objects more distant appear redder.



Author: Scott S. Sheppard Carnegie Institution of Washington

Source: https://arxiv.org/







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