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观测国际空间站凌月

曹军

2005年12月18日国际空间站凌月。凌月带宽度7公里左右,在北京东北方向。

17日周六,根据CALSKY上的预报地点,和寇文一起前去踩点。从六环路火神营出口向北直行,沿路均是高大的杨树,非常好看。

在稷山营村附近找到两条南北向的路,环境比较适于观测。

18日晨5时出发,走之前又看了一下预报,凌月带向西移了半公里。天空有些云,让人有点不安。

与王炎,张琳娜,寇文赴观测点,6时前到达。无风,但非常寒冷,令人不由得缩手缩脚。

6点半前后云全部散开。预报时间到了,在西北发现ISS,向东南移动,非常明亮,从运动方向上看感觉不会从月亮前面经过似的。

ISS接近月亮后,在取景器中守候。本以为可以看到ISS划过月面的情景,可实际上空间站刚在取景器中出现就“跳过”了月面,和想像的1秒钟的凌月景象相差甚远。

用RAW格式连拍六张,恰好覆盖了整个过程。

回来检查发现,凌月时间的预报相当准确,误差在几秒之内,但轨迹有偏差,也许是高度调整造成的。

预报空间站距离616公里,仰角32度,角径30角秒。按照CALSKY上的数据ISS73X44X27米长计算应该达不到这么大的视角。从照片上测量宽度约13角秒。

ISS比月面亮。原先希望能够以月面为背景看到空间站未被阳光照亮部分的剪影,但未如愿。

以FS78加2X增倍镜加20D拍摄,比例尺约1角秒/像素。1/1000秒,ISO800。六张连拍,叠加(取最大值),轨迹从右上至左下。

右下角为进入月面时、左上角为飞离视月面时原大照片。


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