Dynamically different groups of comets and active asteroids with orbits at 2 - 5 a. u. show dust activity in varying degrees and forms. Photometric study and comparison of physical parameters can help to classify mechanisms and nature of the activity for such objects. We present new observations using broadband photometry of 15 active objects in the main asteroid belt and surrounding regions obtained during 2012 – 2016. The study aims to compare the physical properties of main-belt comets (MBCs), quasi-Hilda comets (QHCs), and active asteroids (AAs). The observations were carried out with the 0.7-m telescope of the Kyiv Comet Station, Ukraine, and with the 1.23-m telescope at the Calar Alto Observatory, Spain, using BVR broadband filters. Upper limits for the nuclear radii, A f ρ parameters, and color indices were measured. The results of 2012 – 2016 observations suggest that there exist systematic differences in the physical parameters of MBCs and QHCs.

中文翻译：

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主带及周边地区选定活动天体物理性质的宽带测光研究

动态不同的彗星群和轨道在 2 - 5 天文单位的活动小行星显示出不同程度和形式的尘埃活动。光度学研究和物理参数的比较有助于对此类物体的活动机制和性质进行分类。我们使用 2012 年至 2016 年期间获得的主小行星带及其周边地区 15 个活动天体的宽带光度法进行了新的观测。该研究旨在比较主带彗星 (MBC)、准希尔达彗星 (QHC)、和活动小行星（AA）。观测是使用乌克兰基辅彗星站的 0.7 米望远镜和西班牙卡拉阿尔托天文台的 1.23 米望远镜使用 BVR 宽带滤波器进行的。测量了核半径、A f ρ 参数和颜色指数的上限。