长基线ATLAS光度测量：阿联酋小行星带任务七个主带小行星目标

中文摘要 AI 辅助

阿联酋小行星带任务（EMA）将使用MBR探索者号航天器飞越六颗主带小行星——(10253) Westerwald、(623) Chimaera、(13294) Rockox、(88055) Ghaf、(23871) Ousha和(59980) Moza——随后与极度红色的(269) Justitia交会，并向其部署着陆器。我们呈现了对所有七个目标来自小行星地面撞击最后警报系统（ATLAS）的十年稀疏光度测量的同质化分析。对每个天体，我们推导了在ATLAS c和o波段的绝对星等和相位斜率、基于共同相位斜率的c-o颜色、通过相位校正光变曲线的Lomb-Scargle周期图得到的自转周期，以及设定伸长率下限的光变曲线振幅。五个周期是可靠的——Rockox为3.243小时，Justitia为33.1小时，Westerwald为3.64小时，Chimaera为14.6小时，Moza为4.36小时——并与独立研究一致；对于Ousha，由于混叠效应，我们采用了已发表的8.35小时周期，而Ghaf仍未解决。光变曲线反演为Rockox提供了唯一的凸形状和自旋状态，为Chimaera、Moza和Justitia提供了两个极点解；对于Ghaf、Ousha或Westerwald未获得模型，尽管Westerwald的自转轴必须是逆行的。结合c-o颜色与来自相位斜率的反照率类别，我们将样本分类为一个暗C型（Chimaera）、三个可能的S型（Westerwald、Ghaf、Moza）、两个X复合型天体（Rockox，可能是M型，以及Ousha，可能是E型），以及异常红色的L/D型Justitia，其(c-o)=0.48比典型的木星特洛伊天体更红。这仅部分匹配任务基于族群的预期，即主要为原始型目标集，因此我们将其作为可检验的预测呈现。其中Ghaf和Ousha的预测最不可靠——两者均与已发表工作不一致，且具有未解决或混叠的周期——值得后续跟进观测。

英文摘要

The Emirates Mission to the Asteroid Belt (EMA) will use the MBR Explorer spacecraft to fly past six main-belt asteroids -- (10253) Westerwald, (623) Chimaera, (13294) Rockox, (88055) Ghaf, (23871) Ousha and (59980) Moza -- before rendezvousing with, and deploying a lander onto, the extremely red (269) Justitia. We present a homogeneous analysis of a decade of sparse photometry of all seven targets from the Asteroid Terrestrial-impact Last Alert System (ATLAS). For each object we derive absolute magnitudes and phase slopes in the ATLAS c and o bands, the c-o colour on a common phase slope, a rotation period from a Lomb-Scargle periodogram of the phase-corrected light curve, and a light-curve amplitude setting a lower limit on elongation. Five periods are secure -- 3.243 h for Rockox, 33.1 h for Justitia, 3.64 h for Westerwald, 14.6 h for Chimaera and 4.36 h for Moza -- and agree with independent work; for Ousha aliasing leads us to adopt the published 8.35 h, while Ghaf remains unresolved. Lightcurve inversion gives a unique convex shape and spin state for Rockox and two pole solutions for Chimaera, Moza and Justitia; no model was obtained for Ghaf, Ousha or Westerwald, though Westerwald's spin axis must be retrograde. Combining the c-o colour with an albedo class from the phase slope, we classify the sample as one dark C-type (Chimaera), three probable S-types (Westerwald, Ghaf, Moza), two X-complex objects (Rockox, plausibly M-type, and Ousha, possibly E-type), and the exceptionally red L/D-type Justitia, whose (c-o) = 0.48 is redder than typical Jupiter Trojans. This only partly matches the mission's family-based expectation of a predominantly primitive target set, so we present these as testable predictions. Those of Ghaf and Ousha are least secure -- both disagree with published work and have unresolved or aliased periods -- and warrant follow-up.

发表机构

• South African Astronomical Observatory（南非天文台）
• Stellenbosch University（斯泰伦博斯大学）
• Charles University（查理大学）
• Northern Arizona University（北亚利桑那大学）
• University of Hawaii（夏威夷大学）
• University of Oxford（牛津大学）
• Queen’s University Belfast（贝尔法斯特女王大学）
• Instituto de Astrofísica de Canarias (IAC)（加那利天体物理学研究所）
• Universidad de La Laguna (ULL)（拉帕鲁纳大学）

机构由 AI 辅助整理，请以论文原文为准。