Polarimetric Monitoring of Primitive Asteroids near Perihelion in Order to Detect Their Sublimation-Dust Activity

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
V. V. Busarev, N. N. Kiselev, M. P. Shcherbina, N. V. Karpov, A. P. Gorshkov
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引用次数: 0

Abstract

UBVR polarimetric observations of 12 main-belt mostly primitive asteroids located near perihelion heliocentric distances were carried out from December 2022 to April 2023 with Zeiss-2000 telescope at the Terskol Peak observatory. The purpose of the monitoring program was to search for changes in the polarimetric parameters of the asteroids caused by possible sublimation-dust activity, as a result of which the formation of rarefied dust exospheres of asteroids is possible. The objects of the program were asteroids: (1) Ceres, (53) Kalypso, (117) Lomia, (164) Eva, (214) Ashera, (324) Bamberga, (419) Aurelia, (505) Cava, (554) Peraga, (654) Zelinda, (704) Interamnia, (1021) Flammario. Polarimetric observations of asteroids (117) Lomia, (164) Eva and (505) Kava were made for the first time, the remaining asteroids were observed earlier. Only for two asteroids (1) Ceres and (704) Interamnia, according to spectrophotometric observations, temporal spectrophotometric variability was noted earlier. Analysis of temporal changes in the degree of polarization of asteroids and comparison of the results of observations with the data available in the literature showed that the stability of the observed degree of polarization is comparable with measurement errors of \( \sim {\kern 1pt} (0.02{-} 0.1)\)% for asteroids of different brightness. Thus, during the observation period, no noticeable polarization signs of temporary sublimation-dust activity of the observed asteroids were detected. Additionally, it is shown that the currently existing variants of the spectral taxonomy of asteroids, based on spectrophotometric data and albedo, demonstrate a significant scattering of the selected classes when compared with their polarimetric phase dependencies. The asteroid (554) Peraga has been confirmed to have a negative degree of polarization at angles less than the inversion angle. Measurements of the polarization of the asteroid (1) Ceres in a wide range of wavelengths did not confirm the previously suspected change in the angle of the polarization plane with the wavelength.

Abstract Image

Abstract Image

对近日点附近的原始小行星进行极坐标监测,以探测其升华-尘埃活动
摘要 2022 年 12 月至 2023 年 4 月期间,在特尔斯科尔峰天文台使用蔡司-2000 望远镜对位于近日点日心距离附近的 12 颗主带小行星(主要是原始小行星)进行了UBVR 极坐标观测。监测计划的目的是寻找可能的升华-尘埃活动引起的小行星极坐标参数变化,升华-尘埃活动可能导致小行星稀薄尘埃外层的形成。该方案的对象是小行星:(1) 谷神星、(53) Kalypso、(117) Lomia、(164) Eva、(214) Ashera、(324) Bamberga、(419) Aurelia、(505) Cava、(554) Peraga、(654) Zelinda、(704) Interamnia、(1021) Flammario。对小行星(117) Lomia、(164) Eva 和 (505) Kava 的极坐标观测是首次进行,其余小行星的极坐标观测则是在更早之前进行的。只有两颗小行星(1)谷神星和(704)Interamnia,根据分光光度观测,较早注意到分光光度的时间变化。对小行星偏振光度的时间变化进行分析,并将观测结果与文献中的数据进行比较,结果表明观测到的偏振光度的稳定性与不同亮度小行星的测量误差(0.02{-} 0.1)%)相当。因此,在观测期间,没有发现观测到的小行星有明显的临时升华-尘埃活动的偏振迹象。此外,研究还表明,根据分光光度数据和反照率对小行星进行光谱分类的现有变体,与其偏振相位相关性相比,在所选类别中显示出明显的分散性。经证实,小行星 (554) Peraga 在角度小于反转角时具有负偏振度。对小行星(1)谷神星的偏振在宽波长范围内进行的测量并未证实之前怀疑的偏振面角度随波长变化的情况。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Astronomy Reports
Astronomy Reports 地学天文-天文与天体物理
CiteScore
1.40
自引率
20.00%
发文量
57
审稿时长
6-12 weeks
期刊介绍: Astronomy Reports is an international peer reviewed journal that publishes original papers on astronomical topics, including theoretical and observational astrophysics, physics of the Sun, planetary astrophysics, radio astronomy, stellar astronomy, celestial mechanics, and astronomy methods and instrumentation.
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