天津一与星云

2022年6月18日

The Gamma Cygni Nebula
Image Credit & Copyright: Min Xie, Chen Wu, Yizhou Zhang, and Benchu Tang

Explanation: Supergiant star Gamma Cygni is at the center of the Northern Cross. Near the plane of our Milky Way galaxy, that famous asterism flies high in northern summer night skies in the constellation Cygnus the Swan. Known by the proper name Sadr, Gamma Cygni also lies just below center in this telescopic skyscape, with colors mapped from both broadband and narrowband image data. The field of view spans about 3 degrees (six Full Moons) on the sky and includes emission nebula IC 1318 and open star cluster NGC 6910. Filling the upper part of the frame and shaped like two glowing cosmic wings divided by a long dark dust lane, IC 1318’s popular name is understandably the Butterfly Nebula. Right of Gamma Cygni, are the young, still tightly grouped stars of NGC 6910. The distance to Gamma Cygni is around 560 parsecs or 1,800 light-years. Estimates for IC 1318 and NGC 6910 range from 2,000 to 5,000 light-years.

Tomorrow’s picture: don’t crash

天津一与星云
影像提供与版权: Min Xie, Chen Wu, Yizhou Zhang, and Benchu Tang

说明: 超巨星天津一位在”北十字”的中心。而这个著名的星官则座落在银河系盘面附近，位在夏季北半球夜空高悬的天鹅座之内。在这幅由窄与宽波段滤镜数据整合而成的彩色望远镜影像里，英文专名为Sadr的天津一，位在这片星野的中心下方。这幅涵盖约3度（6个满月）天区的影像，所记录的天体还包括发射星云IC 1318和疏散星团NGC 6910。占据视野顶端、形似2片宇宙级发光翅膀、为一道颀长黝黑尘埃带所分隔的IC 1318 ，并不难理解为何其俗名为蝴蝶星云。在天津一右方，可见到年轻仍紧密聚集的NGC 6910之成员星。天津一的距离约为560秒差距（1,800光年）。而IC 1318和NGC 6910的估计距离，则介于2,000到5,000光年之间。 （Gamma Cygni 天津一）

明日的图片: don’t crash