论文标题
在pan-Starrs1档案图像中搜索二进制小行星
Searching for Binary Asteroids in Pan-STARRS1 Archival Images
论文作者
论文摘要
我们开发了两种不同的点扩散函数（PSF）分析技术，用于在宽场调查中发现宽分离二进制小行星。然后，我们将这些技术应用于Pan-Starrs1捕获的4至60 km尺寸范围内的主带小行星的图像。 Johnston（2019）在此尺寸范围内列出了少于10个已知的二进制文件，分离范围大于主要的山丘半径的10％，因此发现更多宽的二元小行星对于理解二进制稳定性的限制并提高我们对小行星质量的了解至关重要。我们通过以下方式分析了每个图像：i）将小行星椭圆形PSF的主要轴向取向与其在天空上的非销钉速率进行比较，ii）比较通过沿着小行星的运动方向折叠图像与附近的田间恒星相比，比较了一维中位数。对于这两种方法，我们都标记了与单个小行星的预期测量显着偏离的任何结果，并且那些具有最多标志的靶标被鉴定为二进制候选物，以确认使用高阳性成像。
We developed two different point spread function (PSF) analysis techniques for discovering wide separation binary asteroids in wide field surveys. We then applied these techniques to images of main belt asteroids in the 4 to 60 km size range captured by Pan-STARRS1. Johnston (2019) lists fewer than 10 known binaries in this size range with separations greater than 10% of the primary's Hill radius, so discovering more wide binary asteroids is crucial for understanding the limits of binary stability and improving our knowledge of asteroid masses. We analyzed each image by: i) comparing the major axis orientation of the asteroid's elliptical PSF to its non-sidereal rate on the sky, and ii) comparing the one-dimensional median profile created by collapsing the image along the asteroid's direction of motion to that of nearby field stars. For both methods, we flagged any results that deviated significantly from the expected measurements of single asteroids, and those targets with the most flags were identified as binary candidates for confirmation with high-acuity imaging.
