212小时长曝光的猎户座

2020 March 29

A 212-Hour Exposure of Orion
Image Credit & Copyright: Stanislav Volskiy, Rollover Annotation: Judy Schmidt

Explanation: The constellation of Orion is much more than three stars in a row. It is a direction in space that is rich with impressive nebulas. To better appreciate this well-known swath of sky, an extremely long exposure was taken over many clear nights in 2013 and 2014. After 212 hours of camera time and an additional year of processing, the featured 1400-exposure collage spanning over 40 times the angular diameter of the Moon emerged. Of the many interesting details that have become visible, one that particularly draws the eye is Barnard’s Loop, the bright red circular filament arcing down from the middle. The Rosette Nebula is not the giant red nebula near the top of the image — that is a larger but lesser known nebula known as Lambda Orionis. The Rosette Nebula is visible, though: it is the red and white nebula on the upper left. The bright orange star just above the frame center is Betelgeuse, while the bright blue star on the lower right is Rigel. Other famous nebulas visible include the Witch Head Nebula, the Flame Nebula, the Fox Fur Nebula, and, if you know just where to look, the comparatively small Horsehead Nebula. About those famous three stars that cross the belt of Orion the Hunter — in this busy frame they can be hard to locate, but a discerning eye will find them just below and to the right of the image center.

Tomorrow’s picture: shadow saturn

212小时长曝光的猎户座
图片来源及版权：Stanislav Volskiy，滚动注释：Judy Schmidt

说明：猎户座并不仅仅是排在一起的三颗亮星，而是一个富含令人印象深刻的星云的天区。为了更好地欣赏这片广为人知的天区，我们在2013年和2014年的许多晴朗夜晚进行了超长时间曝光。经过212个小时的拍摄和一年多的处理，诞生了这幅1400张照片的特色拼贴画，它的跨度超过了月球角直径的40倍。许多有趣的细节在这副图像中变得清晰可见，其中一个特别吸引眼球的是巴纳德环，一条贯穿图片中下部的鲜红的环形条带。靠近图像顶部的巨大红色星云并不是玫瑰星云，而是一个大型但鲜为人知的星云猎户座 。玫瑰星云也是可见的，它是左上角的红白色星云。画面中心偏上的亮橙色星星是参宿四，右下角的亮蓝色星星是参宿七。其他著名的可见星云还有女巫头星云、火焰星云、狐皮星云，如果你知道去哪里看，还能看到相对较小的马头星云。在这张内容丰富的图像中，位于猎户座腰带的三颗著名恒星可能很难被定位，但敏锐的眼睛可以在图像中心的右下方找到。

明日一图预告：shadow saturn