Other
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.3703j&link_type=abstract
American Astronomical Society, DPS meeting #38, #37.03; Bulletin of the American Astronomical Society, Vol. 38, p.550
Other
Scientific paper
2004 XR190 (aka "Buffy") is the first TNO to be discovered on a nearly-circular orbit beyond 48 AU. Fitting an orbit to 30 astrometric measurements obtained over the course of a year gives an orbit for Buffy of a=57.4 ± 0.2 AU, e=0.10 ± 0.02, i=46.640° ± 0.004. All viable orbits give perihelia distances above 50 AU, beyond the reach of perturbations from the present-day giant planets. The high inclination of Buffy's orbit, however, indicates that it suffered a strong dynamical perturbation in its history. The discovery of Buffy, along with other TNOs of rare classes, provides a chance to test theories of the evolution of the outer Solar System.
There are three main theories to explain the current state of the Kuiper belt: an early stellar passage, rogue planetary embryos, and resonance migration. While each of these has strengths and weaknesses in explaining the Kuiper belt as a whole, each of them also has problems in explaining Buffy. The main problem in each case is how to create a high inclination in combination with a low eccentricity, especially with a semi-major axis so close to the Classical belt TNOs. Our most recent observations have shown that Buffy is not in the 8:3 mean motion resonance.
Photometric observations conducted at CFHT give colors for Buffy of g'-r' = 0.55 ± 0.04, r'-i'=0.30 ± 0.04, placing Buffy within the neutral or gray range of TNOs. Other TNOs with high perihelia (the Extended Scattered Disk objects) have colors ranging from neutral to very red.
Gladman Brett
Jones Robert L.
Kavelaars John J.
Nicholson Phil
Parker Joel William
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