彗星2P/Encke的长期光变曲线
Secular Light Curve of 2P/Encke: A Comet Active At Aphelion
摘要：
本文给出了2P/Encke彗星在两个相空间中的长期光变曲线，对数图和时间图。这项工作的主要结论是：a）彗星在近日点和远日点都有活动，这是由两个不同的活动区域造成的：靠近南极的源1，在近日点活动，而源2，在北极，以远日点为中心。b）从长期光变曲线中测量了超过18个物理参数，其中许多是新的，并在彗星的各个图中列出。具体地说，我们发现源1的活动开启和关闭点的位置，RON =-1.63 +-0.03 AU，ROFF =+1.49 +-0.20 AU，TON =-87 +-5 d，TOFF =+94 +-15 d，时滞，LAG（q）= 6 +-1 d，总活动时间，TACTIVITY = 181 +-16 d，以及长期光曲线的振幅，c）根据这些信息，可以计算出Ferrin（Icarus 178，493 - 516，2005a，and Icarus，185，523 - 543，2006）中定义的光度年龄和时间年龄，我们发现P-AGE = 97 +-8彗星年和T-AGE = 103 +-9彗星年（cy）。因此，2P/Encke彗星是一颗进入玛士撒拉阶段（100 cy <age）的老彗星。D.远日点的活动（源2），延伸到TACTIVITY = 815 ± 30 d，久期光变曲线的振幅为ASEC（1，Q）= 3.0 ± 0.2 mag. e）由新的相图确定了核的绝对振幅和相位系数，得到RNUC（1，1，0）= 15.05 ± 0.14，Betha = 0.066 ± 0.003。从这些数据中，我们发现一个核的有效直径DEFFE = 5.12（+2.5;-1.7）公里。这些值与以前的测定值相差不大，但误差较小。其他结果见完整摘要。
英文摘要：
We present the secular light curve of comet 2P/Encke in two phase spaces, the log plot, and the time plot. The main conclusions of this work are: a) The comet shows activity at perihelion and aphelion, caused by two different active areas: Source 1, close to the South pole, active at perihelion, and Source 2, at the North pole, centered at aphelion. b) More than 18 physical parameters are measured from the secular light curves, many of them new, and are listed in the individual plots of the comet. Specifically we find for Source 1 the location of the turn on and turn off points of activity, RON= -1.63+-0.03 AU, ROFF= +1.49+-0.20 AU, TON= -87+-5 d, TOFF= +94+-15 d, the time lag, LAG(q)= 6+-1 d, the total active time, TACTIVITY= 181+-16 d, and the amplitude of the secular light curve, ASEC(1,1) = 4.8+-0.1 mag. c) From this information the photometric age and the time-age defined in Ferrin (Icarus 178, 493-516, 2005a, and Icarus, 185, 523-543, 2006), can be calculated, and we find P-AGE=97+-8 comet years and T-AGE= 103+-9 comet years (cy). Thus comet 2P/Encke is an old comet entering the methuselah stage (100 cy < age). d) The activity at aphelion (Source 2), extends for TACTIVITY = 815+-30 d and the amplitude of the secular light curve is ASEC (1,Q) = 3.0+-0.2 mag. e) From a new phase diagram an absolute magnitude and phase coefficient for the nucleus are determined, and we find RNUC(1,1,0)= 15.05+-0.14, and betha= 0.066+-0.003. From this data we find a nucleus effective diameter DEFFE = 5.12(+2.5;-1.7) km. These values are not much different from previous determinations but exhibit smaller errors. Additional results appear in the full abstract.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
