ngc147和ngc185
(原标题: NGC 147 and NGC 185)
2021-11-04
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矮星系ngc147（左）和ngc185在这幅清晰的望远镜图像中并排站立。这两颗卫星是距我们250万光年远的巨大的仙女座星系M31的卫星，通常不会被成像。它们在天空中的距离，在一个美丽的视野范围内不到一度，换算成仙女座星系的距离只有大约35000光年，但仙女座星系本身就在这个框架之外。更明亮、更著名的仙女座卫星星系M32和M110离大螺旋星系更近。NGC 147和NGC 185被确定为双星系，形成了一个引力稳定的双星系统。但最近发现的昏暗矮星系仙后座II似乎也是它们系统的一部分，在仙女座迷人的小卫星星系群中形成了一个引力束缚的星系群。
查看原文解释
Dwarf galaxies NGC 147 (left) and NGC 185 stand side by side in this sharp telescopic portrait. The two are not-often-imaged satellites of M31, the great spiral Andromeda Galaxy, some 2.5 million light-years away. Their separation on the sky, less than one degree across a pretty field of view, translates to only about 35 thousand light-years at Andromeda's distance, but Andromeda itself is found well outside this frame. Brighter and more famous satellite galaxies of Andromeda, M32 and M110, are seen closer to the great spiral. NGC 147 and NGC 185 have been identified as binary galaxies, forming a gravitationally stable binary system. But recently discovered faint dwarf galaxy Cassiopeia II also seems to be part of their system, forming a gravitationally bound group within Andromeda's intriguing population of small satellite galaxies.
© Dan Bartlett