月掩土星
影像来源与版权:Cory Schmitz

说明:有时土星会消失不见。然而,它并不是真的消失了,只是当月球移动到到其前面时,它便从视野中消失了。上个月底,从巴西到斯里兰卡的一小片带状区域可以看到这样的月掩土星事件。这幅彩色特征影像是由连续拍摄该事件的视频中最清晰的影像经过数字融合而成,这些影像分别拍摄了土星和相对明亮的月球,并呈现出红色、绿色和蓝色色泽。这些曝光影像拍摄于南非,就在掩星事件之前,也在日出之前。大约两个小时后,当土星再次出现在月球的另一边时,太阳已经升起。今年,几乎每个月都会发生一次月掩土星,但不幸的是,只有那些位于绝佳观测位置的人在黑暗晴朗天空下才能看到。
翻译:北京天文馆

Moon Occults Saturn
Image Credit & Copyright: Cory Schmitz

Explanation: Sometimes Saturn disappears. It doesn’t really go away, though, it just disappears from view when our Moon moves in front. Such a Saturnian eclipse was visible along a small swath of Earth — from Brazil to Sri Lanka — near the end of last month. The featured color image is a digital fusion of the clearest images captured by successive videos of the event taken in red, green, and blue, and taken separately for Saturn and the comparative bright Moon. The exposures were taken from South Africa just before occultation — and also just before sunrise. When Saturn re-appeared on the other side of the Moon almost two hours later, the Sun had risen. This year, eclipses of Saturn by the Moon occur almost monthly, but, unfortunately, are visible only to those with the right location and with clear and dark skies.
Astronomy Picture of the Day 04/09/2019