2025年8月7日
The Double Cluster in Perseus
Image Credit & Copyright: Ron Brecher
Explanation: This stunning starfield spans about three full moons (1.5 degrees) across the heroic northern constellation of Perseus. It holds the famous pair of open star clusters, h and Chi Persei. Also cataloged as NGC 869 (right) and NGC 884, both clusters are about 7,000 light-years away and contain stars much younger and hotter than the Sun. Separated by only a few hundred light-years, the clusters are both 13 million years young based on the ages of their individual stars, evidence that both clusters were likely a product of the same star-forming region. Always a rewarding sight in binoculars or small telescopes, the Double Cluster is even visible to the unaided eye from dark locations.
Tomorrow’s picture: Dawn of the Crab
英仙座双星团
影像提供与版权: Ron Brecher
说明: 这片引人赞叹的星野，呈现了北天英仙座方向约3个满月（1.5度）宽的区域。视野里，有英仙座h与Chi这对著名的双星团。亦拥有编录号NGC 869（右）和 NGC 884的这对星团，距离地球约7,000光年远，其内的成员恒星远比太阳年轻与炽热。二者相隔约数百光年的这对星团，据它们成员星的年龄分析，其年龄都在1,300万年左右，显示这二个星团可能诞生于同一个恒星形成区。在双筒望远镜或小望远镜的视野里，这对双星团是非常迷人的的景观，而在幽暗无光害的地区甚至肉眼可见。
明日的图片: Dawn of the Crab
