Rotational Light Curve, phase, and visible colors of (52246) Donaldjohanson throughout Lucy Mission Flyby

IF 3 2区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Icarus Pub Date : 2025-08-20 DOI:10.1016/j.icarus.2025.116771

A.C. Souza-Feliciano , F.L. Rommel , B.E. Morgado , L.M. Catani

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引用次数: 0

Abstract

The main belt asteroid (52246) Donaldjohanson was visited on April 20th of 2025 by the Lucy spacecraft. We took this opportunity to observe the object with the SOAR telescope, aiming to create synergy between ground- and space-based observations. Our goal includes refining the rotational period of (52246) Donaldjohanson, determining the rotational phase of the flyby observation, and obtaining the photometric colors of (52246) Donaldjohanson in the SDSS and Bessell–Johnson system. To achieve our goals, we used photometric observations of (52246) Donaldjohanson from three datasets: obtained in (i) during the week of Lucy flyby on the SOAR Telescope using r- and i- filters of the SDSS system in five different nights; (ii) August 2019, also on the SOAR Telescope using R- and V- filters of the Bessell–Johnson system on two nights; and (iii) between 2018 and 2025 on the r-, g-, and i- filters of the ZTF survey. Using the ZTF database and SOAR observations, the Lomb-Scargle periodogram confirms its long rotational period of 253.1 ± 2.6 h. The rotational light curve has an amplitude of 1.03 ± 0.03 mag, in agreement with an elongated asteroid. No signal of a secondary object is found in the residual fit at a limit of 0.2 mag. The colors r

-

i and V

-

R agree with a Cg-type asteroid for most of the phases analyzed. Some small variations in colors are found and they could be explained by some heterogeneity on Donaldjohanson’s surface. The angle between the spacecraft, Donaldjohanson, and the SOAR Telescope at the moment of the flyby was estimated to be 102 degrees. The results discussed here could serve as a reference and would support further analyses of the Lucy mission data. The comparison and combination of spacecraft and ground-based observations could allow the extension of the knowledge obtained here to an uncountable number of asteroids that will not have the opportunity to be visited by spacecraft.

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旋转光曲线，相位和可见颜色（52246）Donaldjohanson在整个露西任务飞越

小行星带的主小行星（52246）Donaldjohanson于2025年4月20日被“露西”号宇宙飞船造访。我们利用这个机会用SOAR望远镜观察这个物体，目的是在地面和空间观测之间建立协同作用。我们的目标包括改进（52246）Donaldjohanson的旋转周期，确定飞掠观测的旋转相位，并获得（52246）Donaldjohanson在SDSS和Bessell-Johnson系统中的光度颜色。为了实现我们的目标，我们使用了来自三个数据集的（52246）Donaldjohanson的光度观测数据：(i)在Lucy飞越的一周内，在SOAR望远镜上使用SDSS系统的r-和i-滤波器在五个不同的夜晚获得；（ii） 2019年8月，同样在SOAR望远镜上使用贝塞尔-约翰逊系统的R-和V-滤波器，为期两个晚上；（iii） 2018年至2025年期间，ZTF调查的r-， g-和i-过滤器。利用ZTF数据库和SOAR观测数据，Lomb-Scargle周期图证实了它的长旋转周期为253.1±2.6 h。旋转光曲线的振幅为1.03±0.03等，与一颗拉长的小行星一致。在0.2等的残余拟合中没有发现次生天体的信号。在分析的大多数相位中，r - i和V - r的颜色与cg型小行星一致。在颜色上发现了一些小的变化，这可以用Donaldjohanson表面的一些异质性来解释。飞船Donaldjohanson和SOAR望远镜在飞掠的时刻之间的角度估计为102度。这里讨论的结果可以作为参考，并将支持对露西任务数据的进一步分析。航天器和地面观测的比较和结合可以使在这里获得的知识扩展到无数的小行星，这些小行星将没有机会被航天器访问。

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

Icarus 地学天文-天文与天体物理

CiteScore

6.30

自引率

18.80%

发文量

356

审稿时长

2-4 weeks

期刊介绍： Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.