2质量J17554042 + 6551277
(原标题: 2MASS J17554042+6551277)
2022-03-19
浏览次数: 15
2MASS J17554042+6551277这个名字听起来不太拗口，但这是一个基于坐标的星表编号，位于这张清晰视野中心的恒星。然而，遥远宇宙的粉丝们应该习惯它尖锐的外表。衍射图案是由詹姆斯·韦伯太空望远镜的18个六边形反射镜片段形成的。展开后，这些部分现在已经被调整，以实现红外波长的衍射限制对准，同时作为一个6.5米直径的主镜协同工作。由韦伯的NIRcam拍摄的最终图像证明了它们的精确排列是物理学所允许的最好的。2MASS J17554042+6551277距离我们大约2000光年，在我们自己的星系内。但是散布在韦伯望远镜校准评估图像背景上的星系可能距离我们数十亿光年远，远远超出了银河系。
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2MASS J17554042+6551277 doesn't exactly roll off the tongue but that's the name, a coordinate-based catalog designation, of the star centered in this sharp field of view. Fans of the distant universe should get used to its spiky appearance though. The diffraction pattern is created by the 18 hexagonal mirror segments of the James Webb Space Telescope. After unfolding, the segments have now been adjusted to achieve a diffraction limited alignment at infrared wavelengths while operating in concert as a single 6.5 meter diameter primary mirror. The resulting image taken by Webb's NIRcam demonstrates their precise alignment is the best physics will allow. 2MASS J17554042+6551277 is about 2,000 light-years away and well within our own galaxy. But the galaxies scattered across the background of the Webb telescope alignment evaluation image are likely billions of light-years distant, far beyond the Milky Way.