2019年IOAA夜间观测第2题（替代）：观测天琴座ε

英文题目

TASK 2 / ALTERNATIVE: EPSILON LYRAE available time: 10 minutes

15 points

• Find e Lyr, and make a drawing of the field of view (with the object and other stars) with 10mm eyepiece.

Label the directions North and East by two arrows and mark them as ‘N’ and ‘E’.

• Estimate the angular distance between the wide pair (ε1-ε2), and estimate the position angle of the same pair.

• Increase the magnification with 2x Barlow lens to be able to resolve and separate the two close pairs. Estimate the angle (in degrees to the nearest integer) subtended by the two close pairs relative to each other. (The enclosed angle of the two lines going through the two narrow pairs).

Do not give any PA, only the relative angle of the two close pairs. No drawing is needed.

If you cannot find e Lyr, the assistant can point to it for you, but only after 5 minutes. In this case you will lose the marks for pointing the telescope to the object.

The telescope assistant will check the object at the end of the 10 min limit. If you are ready sooner, keep the star in the FOV, and wait for the check.

中文题目

任务2 /替代：EPSILON LYRAE

可用时间：10分

15分

•找到ε Lyr，用10mm目镜画出视野（画出目标其他星星）。

用两个箭头标记北向和东向，并将它们标记为“N”和“E”。

•估算距离较远的一对（ε1-ε2）之间的角距，并估算这一对的位置角。

•使用2x Barlow镜头增加放大倍率，以便能够分辨和分离两对更紧密的恒星对。估计两个近距对相对于彼此所成的角度（以度为单位，精确到整数）。 （两对近距对延长线相交所成的角度）。

不需要要给任何位置角，只给出两个紧密对的相对角度。不需要绘图。

如果您找不到ε Lyr，观测助手可以为你指出，但仅在任务开始5分钟后。在这种情况下，您将丢失将望远镜指向物体的分数。

观测助手将在10分钟限制结束时检查目标。如果您早点准备好，请将目标留在视场中，然后等待检查。