奎宿九的幽灵
(原标题: Mirach's Ghost)
2021-10-28
浏览次数: 36
就鬼魂而言，Mirach's Ghost并没有那么可怕。Mirach's Ghost只是一个微弱的、模糊的星系，天文学家对它很熟悉，它恰好在明亮的Mirach恒星的视线上被看到。在这颗恒星群的中心，Mirach也被称为Beta仙女座。大约200光年远，Mirach是一颗红巨星，比太阳冷，但比太阳大得多，所以本质上比我们的母恒星亮得多。在大多数望远镜的视野中，眩光和衍射峰往往会掩盖Mirach附近的东西，使这个模糊的星系看起来像一个幽灵般的内部反射，几乎是压倒性的星光。尽管如此，在这张清晰的图像中，Mirach的右上方，Mirach的幽灵被编目为NGC 404星系，估计距离我们大约1000万光年。
查看原文解释
As far as ghosts go, Mirach's Ghost isn't really that scary. Mirach's Ghost is just a faint, fuzzy galaxy, well known to astronomers, that happens to be seen nearly along the line-of-sight to Mirach, a bright star. Centered in this star field, Mirach is also called Beta Andromedae. About 200 light-years distant, Mirach is a red giant star, cooler than the Sun but much larger and so intrinsically much brighter than our parent star. In most telescopic views, glare and diffraction spikes tend to hide things that lie near Mirach and make the faint, fuzzy galaxy look like a ghostly internal reflection of the almost overwhelming starlight. Still, appearing in this sharp image just above and to the right of Mirach, Mirach's Ghost is cataloged as galaxy NGC 404 and is estimated to be some 10 million light-years away.
© John Chumack