（6478）Gault在2019年1月13日至3月28日期间的活动
Activity of (6478) Gault during January 13 - March 28, 2019
摘要：
我们介绍了2019年1月15日至3月28日期间在日心距离为2.46至2.30 au和地心距离为1.79至1.42 au的活动小行星（6478）Gault的光度观测结果。观测于2019年1月15日在SAI MSU（CMO）的2.5米望远镜上进行，并分别于2019年2月6日和3月28日在1.3米和0.61米望远镜（SPb）上进行。用宽带B、V和R滤波器获得了小行星的直接图像。在所有观测日期都探测到彗星状结构。建立了彩色地图，并分析了2019年1月15日观测的尾部颜色变化。计算了R滤器的$Afρ$，2019年1月至3月底期间的评价值在47 cm至32 cm之间变化。由光变曲线用不同方法估算出该天体的自转周期约为1.79小时，并讨论了激发Gault活动的可能机制。
英文摘要：
We present the results of photometric observations of active asteroid (6478) Gault performed at heliocentric distances from 2.46 to 2.30 au and geocentric distances from 1.79 to 1.42 au between January 15 and March 28, 2019. Observations were carried out at the 2.5-m telescope of SAI MSU (CMO) on January 15, 2019 and at the 1.3-m and 0.61-m telescopes (SPb) on February 6 and March 28, 2019, respectively. The direct images of the asteroid were obtained with the broad-band B, V and R filters. Comet-like structures were detected at all observation dates. Colour maps were built and colour variations along the tail for the observation made on January 15, 2019 were analyzed. The $Afρ$ was calculated for the R filter, The evaluated value varies from 47 to 32 cm for the period from January to the end of March, 2019. The rotational period of the body is estimated from the light curve by different methods and is about 1.79 hr. Possible mechanisms of triggering Gault's activity are discussed.
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