The Double Cluster in Perseus
Image Credit & Copyright: Jack Groves
Explanation: This pretty 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 (top) 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 they were likely a product of the same star-forming region. Always a rewarding sight in binoculars, the Double Cluster is even visible to the unaided eye from dark locations. But a shroud of guitar strings was used to produced diffraction spikes on the colorful stars imaged in this vibrant telescopic view.
Global Moon Party: Including APOD’s Best Moon Images: Saturday, October 9
Tomorrow’s picture: 50 light-years to planet Dimidium
影像提供与版权: Jack Groves
说明: 这幅美丽的星场，涵盖北天英仙座内宽约3个满月(1.5度)的区域。其内有英仙座h与Chi双星团，这对很著名的疏散星团。编录号分别为NGC 869（上）和NGC 884的双星团，二者的距离皆约为7,000光年远，而成员星则远比太阳炽热且年轻。分析它们的成员星，可推断这二个相隔约数百光年的星团，年龄皆在1千3百万左右，因此，它们可能形成于同一个恒星形成区。于双筒望远镜里很出采的这对双星团，在低光害地区，甚至用肉眼即可见。这幅色彩艳丽的望远镜影像，特别透过由吉他弦构成的遮罩所拍摄，以产生色彩缤纷恒星的绕射芒。
明日的图片: 50 light-years to planet Dimidium