180113期:升空与返程

升空与返程

这张由三次连续曝光组合而成的蔚蓝星空影像,向我们呈现了猎鹰9号火箭于1月7日从地球的“太空海岸”成功发射及其一级火箭降落的景致。自最左侧划出的明亮光痕记录下了该火箭自卡纳维拉尔角空军基地发射升空的初始轨迹。可以看到,弧线顶部有一个向上翘的钩痕,这标志着一级火箭开始了它的返程,与此同时,分离后的二级火箭继续沿原轨道前进。由于透视效应,在弧形轨迹的上方,另一道明亮光痕展现了一级火箭朝着卡纳维拉尔角空军基地缓慢降落的回程景象。经过17秒的减速燃烧,该一级火箭在发射约8分钟后成功于第一着陆区完成了垂直降落,影像中下方地平线上的光痕就是由此造成的。地球自转与长时间曝光也使恒星们在蔚蓝夜空中摇曳出短短的痕迹。

译:银河说翻译组 俞天丽

                                           Launch and Landing
                             Image Credit & Copyright: John Kraus

Explanation: A composite of three consecutive exposures, this night skyscape follows the January 7 launch and first stage landing of a Falcon 9 rocket from a beach on planet Earth’s space coast. With the launch from Cape Canaveral Air Force Station, the bright streak beginning farthest left traces the initial phase of the rocket’s flight. A visible upward hook marks the first stage beginning its return trajectory with a “boostback burn” near the top of the arc, while the second stage separates and continues toward orbit. Above the top of the launch arc due to perspective, a bright streak shows the returning first stage slowing and descending toward the Cape. Centered below, the streak at the horizon is a 17 second burn finally slowing the first stage to a successful vertical landing about 8 minutes after launch at Landing Zone 1. During the scene’s effective long exposure time, the background stars leave short trails in the night sky of the rotating planet.

发表评论

电子邮件地址不会被公开。 必填项已用*标注