下弦月与昴宿星团

下弦月与昴宿星团

Quarter Moon and Sister Stars
Image Credit & Copyright: Alan Dyer, TWAN

Explanation: Nine days ago, two quite different sky icons were imaged rising together. Specifically, Earth’s Moon shared the eastern sky with the sister stars of the Pleiades cluster, as viewed from Alberta, Canada. Astronomical images of the well-known Pleiades often show the star cluster’s alluring blue reflection nebulas, but here they are washed-out by the orange moonrise sky. The half-lit Moon, known as a quarter moon, is overexposed, although the outline of the dim lunar night side can be seen by illuminating earthshine, light first reflected from the Earth. The featured image is a composite of eight successive exposures with brightnesses adjusted to match what the human eye would see. The Moon passes nearly — or directly — in front of the Pleaides once a month.

Tomorrow’s picture: cosmic bat signal

下弦月与昴宿星团
影像提供与版权: Alan Dyer, TWAN

说明: 九天前，2种截然不同的天体一同升起。更精确的说，从加拿大 艾伯塔省看出去，月亮与昴宿星团的成员星共享了西方的天空。众所周知的昴宿星团的天文影像，通常会呈现星团迷人的蓝色反射星云，然而在此例中，它们却淹没在日落天空的橘红辉光中。而下弦月的半亮月面则曝光过度，不过在地球反照光的照耀下，月球昏暗夜面的轮廓依稀可辨。这幅主题影像是由8张连续曝光的照片组合而成，而它们的亮度皆经过调整以近似人眼所见。在每个月，月亮都会通过昴宿星团的附近，甚至直接掩食昴宿星团。

明日的图片: cosmic bat signal