NGC 6946和NGC 6939
(原标题: NGC 6946 and NGC 6939)
2025-07-04
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正对的螺旋星系NGC 6946和疏散星团NGC 6939分享了这张宇宙快照，由地球上的小型望远镜拍摄的超过68小时的图像数据组成。这幅图的视野跨度约为1度，相当于北部仙王座天空中的2个满月。透过银河系平面附近暗淡的星际尘埃云，我们可以看到疏散星团NGC 6939的恒星距离我们5600光年，位于画面右下方。面朝上的螺旋星系NGC 6946位于左上方，但距离我们大约2200万光年。在过去的100年中，在NGC 6946中发现了10颗超新星，最近的一颗是在2017年发现的。相比之下，我们银河系中超新星的平均发生率大约是每100年1颗左右。当然，NGC 6946也被称为“烟花星系”。
查看原文解释
Face-on spiral galaxy NGC 6946 and open star cluster NGC 6939 share this cosmic snapshot, composed with over 68 hours of image data captured with a small telescope on planet Earth. The field of view spans spans about 1 degree or 2 full moons on the sky toward the northern constellation Cepheus. Seen through faint interstellar dust couds near the plane of our Milky Way galaxy, the stars of open cluster NGC 6939 are 5,600 light-years in the distance, near bottom right in the frame. Face-on spiral galaxy NGC 6946 is at top left, but lies some 22 million light-years away. In the last 100 years, 10 supernovae have been discovered in NGC 6946, the latest one seen in 2017. By comparison, the average rate of supernovae in our Milky Way is about 1 every 100 years or so. Of course, NGC 6946 is also known as The Fireworks Galaxy.
© Alberto Pisabarro