The Colors of Inner Oort Cloud, Extended/Detached Disk and Retrograde Outer Solar System Objects

Details The Colors of Inner Oort Cloud, Extended/Detached Disk and Retrograde Outer Solar System Objects The Colors of Inner Oort Cloud, Extended/Detached Disk and Retrograde Outer Solar System Objects

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.6205s&link_type=abstract

American Astronomical Society, DPS meeting #41, #62.05

Astronomy and Astrophysics

Astronomy

Scientific paper

Extreme outer Solar System objects that have possible origins beyond the Kuiper Belt edge, high inclinations, very large semi-major axes or large perihelion distances were observed to determine their optical colors. All three objects that have been dynamically linked to the inner Oort cloud by various authors (Sedna, 2006 SQ372, and 2000 0067) were observed to have ultra-red surface material. This ultra-red material is generally associated with rich organic material and the low inclination classical Kuiper Belt objects. Our observations show it may be a more general feature for objects kept far from the Sun. The two recently discovered retrograde outer Solar System objects (2008 KV42 and 2008 YB3) show only moderately red surfaces very similar to known comets, suspected dead comets, Trojans, Irregular satellites, D-type asteroids and damocloids. The extended or detached disk objects, which are usually considered to be detached from the influence of the giant planets but yet have large eccentricities, are found to have a wide range of colors from moderately red to almost but not quite ultra-red. The detached disk object's colors are similar to the scattered disk and Plutino colors and indicate that most probably came from a similar location, likely from the higher inclination Kuiper Belt objects and not from the ultra-red, low inclination classical Kuiper Belt reservoir.

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