猎户座内的星际云
影像来源与版权:Andrew Klinger

说明:猎户座是拥有一排远多于三颗恒星的星座。这是一个富有壮丽星云的空间方向。为了更好地欣赏这片著名的天区,我们在一月、二月和三月的多个晴朗夜晚拍摄了一幅新的长曝光影像。经过23个小时的相机拍摄和无数个小时的图像处理,这幅特征拼接影像制作完成,其大小为月球角直径的40多倍,并呈现出氢、氧和硫所发出辉光。在众多可见的有趣细节中,特别引人注目的是巴纳德环,即影像中心右侧的亮红橙色光弧。玫瑰星云并不是影像中心左侧的庞大橙色星云,它被称为梅萨环,是一个更庞大但鲜为人知的星云。而玫瑰星云在影像底部可见,它呈现出亮橙色、蓝色和白色色泽。影像中心左侧的亮橙色恒星是参宿四,而右上方的亮蓝色恒星是参宿七。这三颗著名的恒星分布在猎户腰带上,在这幅繁忙的影像中,它们很难被找到,但是明眼人会在影像中心右侧发现它们。
翻译:北京天文馆

The Interstellar Clouds of Orion
Image Credit & Copyright: Andrew Klinger

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, a new long exposure image was taken over several clear nights in January, February and March. After 23 hours of camera time and untold hours of image processing, the featured collage in the light of hydrogen, oxygen, and sulfur was produced spanning over 40 times the angular diameter of the Moon. Of the many interesting details that have become visible, one that particularly draws the eye is Barnard’s Loop, the bright red orange arc just to the right of the image center. The Rosette Nebula is not the giant orange nebula just to the left of the image center — that is larger but lesser known nebula known as the Meissa Ring. The Rosette Nebula is visible, though: it is the bright orange, blue and white nebula near the image bottom. The bright orange star just left of the frame center is Betelgeuse, while the bright blue star on the upper right is Rigel. 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 to the right of the image center.
Astronomy Picture of the Day 06/05/2019