JunoPerijove 34: Update Ganymede 3D-control network and new DEMs study

IF 1.8 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Planetary and Space Science Pub Date : 2024-09-25 DOI:10.1016/j.pss.2024.105981

I.E. Nadezhdina, A.E. Zubarev, N.A. Kozlova, N.A. Slodarzh, I.P. Karachevtseva

引用次数: 0

Abstract

During the Juno Perijove 34 the JunoCam acquired four RGB images of Ganymede. These images and updated SPICE kernel for spacecraft's trajectories were used to refine previous 3D-control point network (CPN). As a result, 4954 control points were measured 22,098 times with a minimum of 2 and a maximum of 16 observations per point, based on the 302 best available images from all missions (Voyagers, Galileo and Juno). After adjustment more than 86% of points have accuracy better than 3 km (>97% - better than 5 km). A new libration value for Ganymede 18ʺ is obtained. This updated CPN was used for compiling a new Ganymede global mosaic to support the planning of observations within the JUICE mission. New detailed local DEMs were obtained by stereovectorization for Enki Catena and Tros crater regions. In the Enki chain, the ratio d/D of the depth of craters to their diameter ranges from 0.049 to 0.089 and correlates with the area types (dark or light).

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JunoPerijove 34：更新 Ganymede 3D 控制网络和新的 DEMs 研究

在 Juno Perijove 34 期间，JunoCam 获得了四幅木卫三的 RGB 图像。这些图像和更新的航天器轨迹 SPICE 内核被用来完善先前的三维控制点网络（CPN）。结果，根据所有飞行任务（旅行者号、伽利略号和朱诺号）提供的 302 幅最佳图像，对 4954 个控制点进行了 22 098 次测量，每个点的观测次数最少为 2 次，最多为 16 次。经过调整后，超过 86% 的点的精确度优于 3 千米（97% 优于 5 千米）。获得了甘尼米18ʺ的新天平校准值。更新后的 CPN 被用于编制新的 Ganymede 全球镶嵌图，以支持 JUICE 任务中的观测规划。通过对 Enki Catena 和 Tros 环形山区域进行立体矢量化，获得了新的详细局部 DEM。在恩基环形山链中，环形山深度与直径之比 d/D 在 0.049 至 0.089 之间，与区域类型（深色或浅色）相关。

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来源期刊

Planetary and Space Science 地学天文-天文与天体物理

CiteScore

5.40

自引率

4.20%

发文量

126

审稿时长

15 weeks

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