圆互轨主带双星系统
Main Belt Binary Asteroidal Systems With Circular Mutual Orbits
摘要：
2003年，我们发起了一项长期的自适应光学活动，以研究各种主带小行星系统的轨道。在这里，我们提出了一个一致的解决方案的相互轨道的四个双星系统：22 Kalliope，45 Eugenia，107 Camilla和762 Pulcova。除了45 Eugenia之外，我们没有在这些系统周围检测到任何其他卫星，尽管我们有能力检测到一个松散结合的碎片（位于1/4 x RHill），其直径比主要的小40倍。这些相互轨道的共同特征是它们大致是圆形的。这些双星系统中有三个属于C-“组”分类学类。我们对它们的体积密度的估计一直低于（~1 g/cm 3）相关的陨石类似物，表明内部孔隙率为30-50%（以CI-CO陨石作为类似物）。Kalliope 22是一颗W型小行星，其体积密度高得多，约为3克/立方厘米，这是根据红外天文卫星的辐射尺寸测量得出的。我们比较了这些轨道的潮汐效应演变的光的特点。
英文摘要：
In 2003, we initiated a long-term adaptive optics campaign to study the orbit of various main-belt asteroidal systems. Here we present a consistent solution for the mutual orbits of four binary systems: 22 Kalliope, 45 Eugenia, 107 Camilla and 762 Pulcova. With the exception of 45 Eugenia, we did not detect any additional satellites around these systems although we have the capability of detecting a loosely-bound fragment (located at 1/4 x RHill) that is ~40 times smaller in diameter than the primary. The common characteristic of these mutual orbits is that they are roughly circular. Three of these binary systems belong to a C-"group" taxonomic class. Our estimates of their bulk densities are consistently lower (~1 g/cm3) than their associated meteorite analogs, suggesting an interior porosity of 30-50% (taking CI-CO meteorites as analogs). 22 Kalliope, a W-type asteroid, has a significantly higher bulk density of ~3 g/cm3, derived based on IRAS radiometric size measurement. We compare the characteristics of these orbits in the light of tidal-effect evolution.
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