（47171）1999年TC36，一个外海王星三重
(47171) 1999 TC36, A Transneptunian Triple
摘要：
我们对（47171）1999 TC 36的HST图像进行了新的分析，证实它是一个三重系统。与点扩散函数的拟合一致地表明，表观一次波本身由两个大小相似的分量组成。两个中心成分A1和A2可以在七年时间内的九个时期中的每一个时期中一致地识别出来。在每一个例子中，组件分离，范围从0.023+/-0.002到0.031+/-0.003弧秒，大约是哈勃太空望远镜在606 nm处衍射极限的一半。中央双星的轨道半长轴约为867公里，周期约为1.9天。这些轨道参数产生的系统质量与Msys = 12.75+/-0.06 10^18 kg一致，该质量是从更远的次级卫星B的轨道得出的。三个分量的直径分别为dA_1 = 286（+45，-38）km，dA_2 = 265（+41，-35）km和dB= 139（+22，-18）km。这些组成部分的相对大小比太阳系中任何其他已知的倍数都更相似。总的来说，直径和系统质量得到的堆密度为p=542（+317，-211）kg·m^-3。HST光度测定显示分量B是可变的，振幅>=0.17+/-0.05个量级。分量A1和A2没有显示出大于0.08+/-0.03量级的变化，这与共同轨道平面的方向和潮汐扭曲的平衡形状大致一致。该系统具有很高的比角动量J/J '= 0.93，与大多数已知的外海王星双星相当。
英文摘要：
We present new analysis of HST images of (47171) 1999 TC36 that confirm it as a triple system. Fits to the point-spread function consistently show that the apparent primary is itself composed of two similar-sized components. The two central components, A1 and A2, can be consistently identified in each of nine epochs spread over seven years of time. In each instance the component separation, ranging from 0.023+/-0.002 to 0.031+/-0.003 arcsec, is roughly one half of the Hubble Space Telescope's diffraction limit at 606 nm. The orbit of the central pair has a semi-major axis of a~867 km with a period of P~1.9 days. These orbital parameters yield a system mass that is consistent with Msys = 12.75+/-0.06 10^18 kg derived from the orbit of the more distant secondary, component B. The diameters of the three components are dA1= 286(+45,-38) km, dA2= 265(+41,-35 km and dB= 139(+22,-18) km. The relative sizes of these components are more similar than in any other known multiple in the solar system. Taken together, the diameters and system mass yield a bulk density of p=542(+317,-211) kg m^-3. HST Photometry shows that component B is variable with an amplitude of >=0.17+/-0.05 magnitudes. Components A1 and A2 do not show variability larger than 0.08+/-0.03 magnitudes approximately consistent with the orientation of the mutual orbit plane and tidally-distorted equilibrium shapes. The system has high specific angular momentum of J/J'=0.93, comparable to most of the known Transneptunian binaries.
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