论文标题
活性小行星的光度和动态表征（248370）2005 QN173
Photometric and dynamic characterisation of active asteroid (248370) 2005 QN173
论文作者
论文摘要
我们介绍了最近发现的活跃小行星（248370）2005 QN173（aka 433p）的物理和动力学特性。从我们的观察结果中，我们得出了两个可能的旋转周期解决方案为2.7和4.1小时。纠正昏迷效果后计算的相应光曲线振幅分别为0.28和0.58 mag。这两个时期溶液都比针对无效三轴椭圆形计算的临界旋转极限短，这表明旋转质量脱落至少应部分负责观察到的活性。我们确认活动水平正在进一步淡出，但每天只有0.006 mag的速度非常小，仍然与升华驱动的活动兼容。我们发现248370可能属于Themis小行星家族，这使其成为与该组相关的第四颗主带彗星。 248370的轨道特性也与其起源于年轻的288p小行星簇一致。 288p群集与其同名主皮带彗星相关联，这为对吸引人的主带248370和288p的比较分析提供了令人兴奋的可能性。
We present the physical and dynamical properties of the recently discovered active asteroid (248370) 2005 QN173 (aka 433P). From our observations, we derived two possible rotation period solutions of 2.7 and 4.1 hours. The corresponding light curve amplitudes computed after correcting for the effect of coma are 0.28 and 0.58 mag, respectively. Both period solutions are shorter than the critical rotation limit computed for a strengthless triaxial ellipsoid, suggesting that rotation mass shedding should at least partly be responsible for the observed activity. We confirm that the activity level is fading further, but at a very modest rate of only 0.006 mag/day, still also compatible with sublimation-driven activity. We found that 248370 likely belongs to the Themis asteroid family, making it a fourth main-belt comet associated with this group. Orbital characteristics of 248370 are also consistent with its origin in the young 288P cluster of asteroids. The 288P cluster is associated with its namesake main-belt comet, providing an exciting possibility for a comparative analysis of intriguing main-belt comets 248370 and 288P.
