17 Thetis 发布日期: 17 Thetis is an S-type asteroid from the inner regions of the asteroid belt. It was discovered on April 1852 by Robert Luther. 点击这里帮助我们翻译这个页面。 在 Celestia 中打开(推荐) 或者 下载 如何安装插件?在这里获取指导。