Exploring the Solar System with the NOIRLab Source Catalog I: Detecting Objects with CANFind
Exploring the Solar System with the NOIRLab Source Catalog I: Detecting Objects with CANFind
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DOI：
10.3847/1538-3881/ac2230
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发表时间：
2021-08
期刊：
影响因子：
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通讯作者：
K. Fasbender;D. Nidever
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文献类型：
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作者：
K. Fasbender;D. Nidever
尽管进行了广泛的搜索，太阳系天体（SSO）与地球的距离也相对较近，但许多天体仍未被发现，关于它们的性质和相互作用还有很多东西需要了解。这项工作是致力于检测和分析全天空NOIRLab源目录（NSC）中的SSO系列中的第一项工作。我们使用CANFind（一个计算自动化的NSC tracklet搜索引擎）搜索NSC的第一个数据发布。NSC DR 1包含29亿个独特物体的340亿次测量，CANFind通过迭代聚类方法将其归类为“静止”（遥远的恒星，星系）或移动（SSO）物体。对自行μ ≤ 2.“5 hr−1（0.°017 day−1）的静止天体的探测分别进行了识别和分析。属于高μ天体的剩余探测器在单个夜晚聚集在一起，形成“轨迹”。每个轨迹片段包含对单个移动对象的检测，并基于空间线性度和随时间的运动进行验证。然后计算适当的运动，并通过预测它们在共同时间的位置，将多个夜晚的轨迹和其他无关联的测量结果连接起来，形成“轨迹”。该方法从NSC DR 1中提取了527，055个轨迹片段，覆盖了29，971平方度的天空。这些数据显示了在黄道坐标中具有相似观测μ的不同天体群，即主带小行星、木星特洛伊和柯伊伯带天体。在ugrizY和VR波段，视星等范围从10等到25等。颜色-颜色图显示了主要碳质和硅质组之间的痕迹双峰，支持以前的研究。
Despite extensive searches and the relative proximity of solar system objects (SSOs) to Earth, many remain undiscovered and there is still much to learn about their properties and interactions. This work is the first in a series dedicated to detecting and analyzing SSOs in the all-sky NOIRLab Source Catalog (NSC). We search the first data release of the NSC with CANFind, a Computationally Automated NSC tracklet Finder. NSC DR1 contains 34 billion measurements of 2.9 billion unique objects, which CANFind categorizes as belonging to “stationary” (distant stars, galaxies) or moving (SSOs) objects via an iterative clustering method. Detections of stationary bodies for proper-motion μ ≤ 2.″5 hr−1 (0.°017 day−1) are identified and analyzed separately. Remaining detections belonging to high-μ objects are clustered together over single nights to form “tracklets.” Each tracklet contains detections of an individual moving object, and is validated based on spatial linearity and motion through time. Proper motions are then calculated and used to connect tracklets and other unassociated measurements over multiple nights by predicting their locations at common times, forming “tracks.” This method extracted 527,055 tracklets from NSC DR1 in an area covering 29,971 square degrees of the sky. The data show distinct groups of objects with similar observed μ in ecliptic coordinates, namely Main Belt Asteroids, Jupiter Trojans, and Kuiper Belt Objects. Apparent magnitudes range from 10 to 25 mag in the ugrizY and VR bands. Color–color diagrams show a bimodality of tracklets between primarily carbonaceous and siliceous groups, supporting prior studies.