论文标题
卡西尼成像科学子系统图像的互补天文学
Complementary astrometry of Cassini Imaging Science Subsystem Images of Phoebe
论文作者
论文摘要
菲比（Phoebe）是唯一具有逆行轨道的土星的主要卫星。 Cassini Imaging Science子系统（ISS）在2004年至2017年之间拍摄了许多Phoebe图像，但仅选择了其中的许多图像。在本文中，我们减少了Phoebe的其余ISS图像。在还原中，Gaia EDR3目录用于提供参考星的位置，并使用修改后的力矩来测量图像恒星和菲比的中心。最后，成功减少了834张ISS图像。与JPL Ephemeris SAT375相比，Phoebe的位置是一致的。正确的提升和偏差中的平均残差为0.08“和$ -0.05 $”，残差的标准偏差约为0.2”。就线性单位的残差而言，右升华和偏差中的平均值分别为5 km和$ -2 $ -2 $ km；与标准偏差约为11 km。与JPEM相比。 PH20，我们的测量结果显示出强烈的偏见和较大的分散体。
Phoebe is the only major satellite of Saturn with a retrograde orbit. The Cassini Imaging Science Subsystem (ISS) took a lot of Phoebe images between 2004 and 2017, but only a selection of them has been reduced. In this paper, we reduced the remaining ISS images of Phoebe. In the reduction, the Gaia EDR3 catalogue was used to provide the reference stars' positions, and the modified moment was used to measure the centre of image stars and Phoebe. Finally, a total of 834 ISS images of Phoebe have been reduced successfully. Compared with the JPL ephemeris SAT375, Phoebe's positions are consistent. The average residuals in the right ascension and declination are 0.08" and $-0.05$", and the standard deviations of the residuals are about 0.2". In terms of residuals in linear units, the means in the right ascension and declination are about 5 km and $-2$ km, respectively; The standard deviations are about 11 km. Compared with the JPL ephemeris SAT427 and IMCCE ephemeris PH20, our measurements show a strong bias and a large dispersion.
