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照相星图拍摄记录

2005年10月3/4日:

开工。

高阳。天气晴朗。地处平原,晚上觉潮湿,稍有雾气。镜头左右角无法同时最清晰,因此调整焦点在一个折中的位置。调整赤道仪,标定后GOTO到计划位置。根据赤道仪的精度,曝光时间在480秒。拍摄48度以上的,每区一张,然后沿赤纬指向下一个位置。为避免赤道仪驱动锁死,驱动速度较低,因此转换天区时比较费时。从22点到2点前共拍摄13张,及间插拍摄暗场2张。午夜后镜头开始结露,发现后用镜头布擦拭,可以保证在一张曝光时间内不影响。中间换一次电池,所幸没有发生在曝光之时。最后火星已经升高,拍了3张火星与昴星团的合影,最后一张镜头结露,可以明显看出M45的蓝色云气减弱。

原分辩率样张,标头拍的M31也不小:

2005年10月8/9日:

八达岭。背景和天光稍亮。极轴镜孔处在被挡的状态,首先要转动赤纬轴后再对极轴。然后调焦试拍,这是比较花时间。用天鹅ALPHA标定后拍摄3张,很顺利。接着转到东边较远的另一片天区,同时拍暗场。GOTO结束继续拍摄1张后,发现相机指向有较大偏差。查看发现是在赤经方向快动时有锁死现象,这在以前是很少出现的。调整赤道仪,重新拍摄,有可能在平衡点附近齿隙较大,星像拖线。再经调整基本转入正常,又拍摄了2张,但回来检查后仍不理想。这些反复总共浪费了1个小时。