主带天体7968 = 133 P/Elst-Pizarro的偏振测量和photometry
Polarimetry and photometry of the peculiar main-belt object 7968 = 133P/Elst-Pizarro
摘要：
133 P/Elst-Pizarro是一颗位于主小行星带的活跃小行星或彗星。在这里，我们提出了一个光度和偏振研究这个对象，试图推断有关其起源的其他信息。在2007年133 P/Elst-Pizarro的出现期间，我们使用ESO VLT的FORS 1仪器在相位角范围0 - 20度的9个时期对其核进行了准同时测光和偏振测量。对于每个观测时期，我们还结合了所有可用的帧来获得物体的深度图像，以寻找弱彗星活动的特征。偏振数据进行了分析，通过一种新的物理干涉建模。发现物体亮度在<1小时的时间尺度上变化很大，这一结果与以前的研究完全一致。利用小行星的旋光度-偏振关系和我们的测光结果，我们发现我们的目标的旋光度约为0.06-0.07，平均半径约为1.6公里。在整个观测时期，我们对彗星的深度成像检测到了一条尾巴和一条反尾巴。其时间变化与2007年5月中旬左右开始的最短持续时间为4个月的活动概况一致。我们的图像显示了彗核周围有昏迷的边缘证据。总的光散射行为（光度测定法和偏振测定法）与F-型小行星最为相似。
英文摘要：
133P/Elst-Pizarro is an object that has been described as either an active asteroid or a cometary object in the main asteroid belt. Here we present a photometric and polarimetric study of this object in an attempt to infer additional information about its origin. With the FORS1 instrument of the ESO VLT, we have performed during the 2007 apparition of 133P/Elst-Pizarro quasi-simultaneous photometry and polarimetry of its nucleus at nine epochs in the phase angle range 0 - 20 deg. For each observing epoch, we also combined all available frames to obtain a deep image of the object, to seek signatures of weak cometary activity. Polarimetric data were analysed by means of a novel physical interference modelling. The object brightness was found to be highly variable over timescales <1h, a result fully consistent with previous studies. Using the albedo-polarization relationships for asteroids and our photometric results, we found for our target an albedo of about 0.06-0.07 and a mean radius of about 1.6 km. Throughout the observing epochs, our deep imaging of the comet detects a tail and an anti-tail. Their temporal variations are consistent with an activity profile starting around mid May 2007 of minimum duration of four months. Our images show marginal evidence of a coma around the nucleus. The overall light scattering behaviour (photometry and polarimetry) resembles most closely that of F-type asteroids.
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