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2006年9月28日麻峪房观测

9月28日,虽然一看晚上就是好天气,但一直在犹豫。在城里一直可以看到月亮在地平很低处。到了晚上九点钟实在忍不住,决定干脆一个人出去。

麻峪房的名片也弄丢了。找寇文要了电话联系一下,九点半钟出发。临近十一,到处都是车,八达岭高速前一段和四环似的。在神路旁冷不丁窜出一条大狗来,盯着车灯发愣,也吓了我一激灵。

十点半到达麻峪房,天很晴,银河非常明显,但感觉天光还是挺亮的。

支起赤道仪。调焦和找导星费了一些时间。开始拍照已是下半夜了。

第一个目标是位于仙王座的NGC7023(C4)。这是一个亮反射星云。拍之前不知道它长什么模样。从照片上看,这个星云给人一种阴森诡异的感觉。

原来想接着拍一下附近的sh2-155洞穴星云。但拍完C4后目标已经接近房顶了,这时见到御夫已经很高,于是转向IC405:烽火恒星云。但用ISO1600试拍了3分钟居然看不出,不知是太暗了还是过于弥漫。

为了不耽误时间,改成M33。

这时M33已位于天顶,重新调整一下焦点。以前也发现焦点在一个晚上的时间里会有变化,一方面是望远镜的位置改变会使得相机和接圈连接的部分有形变,另一方面温度的变化也会造成焦点的移动。记得以前在《科学眼》上曾有人介绍过焦点移动会超过1毫米。

到早上5点钟,天迅速放亮。六点半出发,回到了拥挤喧闹水泄不通的北京城。


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