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Five new and three improved mutual orbits of transneptunian binaries
► We present 3 improved and 5 new mutual orbits of transneptunian binary systems. ► The sample of 22 known orbits shows intriguing statistical properties. ► Orbital orientations are consistent with a random distribution. ► Loosely-bound systems are found only on dynamically cold helocentric orbits....
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Published in: | Icarus (New York, N.Y. 1962) N.Y. 1962), 2011-06, Vol.213 (2), p.678-692 |
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Main Authors: | , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | ► We present 3 improved and 5 new mutual orbits of transneptunian binary systems. ► The sample of 22 known orbits shows intriguing statistical properties. ► Orbital orientations are consistent with a random distribution. ► Loosely-bound systems are found only on dynamically cold helocentric orbits. ► Eccentricities exhibit a bimodal distribution.
We present three improved and five new mutual orbits of transneptunian binary systems (58534) Logos-Zoe, (66652) Borasisi-Pabu, (88611) Teharonhiawako-Sawiskera, (123509) 2000 WK
183, (149780) Altjira, 2001 QY
297, 2003 QW
111, and 2003 QY
90 based on Hubble Space Telescope and Keck II laser guide star adaptive optics observations. Combining the five new orbit solutions with 17 previously known orbits yields a sample of 22 mutual orbits for which the period
P, semimajor axis
a, and eccentricity
e have been determined. These orbits have mutual periods ranging from 5 to over 800
days, semimajor axes ranging from 1600 to 37,000
km, eccentricities ranging from 0 to 0.8, and system masses ranging from 2
×
10
17 to 2
×
10
22
kg. Based on the relative brightnesses of primaries and secondaries, most of these systems consist of near equal-sized pairs, although a few of the most massive systems are more lopsided. The observed distribution of orbital properties suggests that the most loosely-bound transneptunian binary systems are only found on dynamically cold heliocentric orbits. Of the 22 known binary mutual orbits, orientation ambiguities are now resolved for 9, of which 7 are prograde and 2 are retrograde, consistent with a random distribution of orbital orientations, but not with models predicting a strong preference for retrograde orbits. To the extent that other perturbations are not dominant, the binary systems undergo Kozai oscillations of their eccentricities and inclinations with periods of the order of tens of thousands to millions of years, some with strikingly high amplitudes. |
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ISSN: | 0019-1035 1090-2643 |
DOI: | 10.1016/j.icarus.2011.03.012 |