上周最佳天文图片11.19-11.25

2018 年11 月19 日
See Explanation. Clicking on the picture will download the highest resolution version available.

瑞典山峰后方的凸月 
影像提供与版权: Göran Strand

说明:这是一轮凸月。对很多地球人来说,更熟悉的是整个面都受太阳照亮的满月,或是只有一抹日曜银弧的蛾眉月而盈于月面半满,但逊于满月的月相,则是凸月鲜少出现在电视和电影的凸月,其实在夜空中很常见的景观。这幅主题影像,是在上个月底摄于瑞典耶姆特兰这轮凸月在数天后,变成(下)蛾眉月,接著成为新月,再过数天后,又变身为(上)蛾眉月。今晚形似的凸月将再现,并在这星期五那晚成为盈满的狸月摄影者原先的意图是要拍摄美丽的凸月景观,却意外的捕捉到一部显然近在前方的飞机,看似从月轮上方掠过。



2018 年11 月20 日

  斥候星际小行星的意料外轨迹 
动画提供: NASA , JPL , Caltech

说明:为何" 斥候星 "的轨迹会与预期有别?在去年,斥候星成为首颗获得确认,来自星际空间穿过我们太阳系的小行星。而在一年多前,这颗不停翻滚的星际巨石更相当接近地球根据标准的重力理论,这颗小行星未来的路径应很容易预测,然而斥候星的路径却与预期稍有差异。这部主题动画呈现斥候星接近与离开太阳附近的路径,其中,预期的重力路径和实际路径特别加上标示。针对这种意外的偏离,最可信的自然因素假说指出是因为这颗小行星受到太阳加热,而触发了内部的气体喷流所致,但其他的揣测与及进一步的电脑模拟仍持续中。斥候星将一去不返,不过现代的太空监控计画,预期会在接下来的数年之中,辨识和追踪更多类似的星际小行星(1I/2017 U1 'Oumuamua斥候星)



2018 年11 月21 日 
See Explanation. Clicking on the picture will download the highest resolution version available.

朱诺号拍摄的木星涡漩和色彩 
影像提供: NASA , Juno , SwRI , MSSS ; Processing & License : Matt Brealey , Seán Doran

说明: 木星云层的色彩是怎么来的?没人能说个准。因为木星厚重大气的主要成分是,这些在低温木星云顶是无色的元素。所以到底是那些微量元素成就了木星云层的色泽,仍然是研究的题材,不过含量不多的硫化氢铵可能的候选者之一。在这张色泽经过强化的主题影像及其他类似的影像里,相当明确的是淡色云的高度通常高于暗色云。在这张影像里,淡色云盘旋在右下角的泛红区之周围,而在右上角,它们则像是覆盖在部分暗区的上方。这张主题影像,是今年初朱诺号太空船在第14次近距离掠过木星之时所拍摄。在椭圆的环形轨道上,朱诺号每53天掠过这颗巨行星附近,每次探索一片稍微不同的区域。


2018 年11 月22 日 
See Explanation. Clicking on the picture will download the highest resolution version available.

星云NGC 281 
影像提供与版权 : Jeremiah Roth

说明: 透视星云NGC 281之时,你可能会漏看疏散星团IC 1590的成员星。然而,诞生于此星云内的这群大质量年轻亮星,却是激发星云发出辉光的终极能源。 这幅星云NGC 281影像里的吸睛结构,是被星团炽热恒星的强烈高能恒星风和辐射,所雕塑和侵蚀出的云气柱和致密尘埃包克云球之剪影。如果这些尘埃结构存在够久,它们可能会成为未来恒星诞生之所。NGC 281位在仙后座内,离我们大约1万光年远,因其外观,也常被戏称为小精灵星云。这幅清晰的组合影像,是由数张窄波段照片组合而成,其中,星云的氢和氧原子辐射,分别以红、绿和蓝来呈现。以星云NGC 281的距离来估算,这幅影像涵盖了超过80光年的区域。




2018 年11 月23 日
See Explanation. Moving the cursor over the image will bring up an annotated version. Clicking on the image will bring up the highest resolution version available.

 早安!狮子座流星 
影像提供与版权 : Stephane Vetter ( Nuits sacrées ), TWAN

说明: 在11月17日的日出前1小时,这颗明亮多彩的流星闪掠过日出前的清朗天空。这片出现在云海上方的精采秋天清晨景观,摄于德国南部黑森林一座拔地而起的1,165米高Hochblauen峰上。在西南方的地平面附近,可见到仍然在曙光中绽放光芒的天狼星与熟悉的猎户座恒星,而这颗流星则看似直冲猎户腰带及配剑而去。不过,身为来自年度狮子座流星雨的流星,它的流星痕回指位在这片视野左上缘之外的狮子座内,这群流星雨的央源




2018 年11 月24 日
See Explanation. Clicking on the picture will download the highest resolution version available.

月落时分的沉船 
影像提供与版权 : Vikas Chander

说明:在这张9月11日摄于纳米比亚.骷髅海岸沙漠海滨的空灵海与天影像里,一抹蛾眉月即将滑入西方的地平线之下。而在非常接近月落的时分,沿着低平远眺大西洋的视线,月光受到了红化与消光。不过,在这张影像中心附近的金星仍在大放光芒,散发着从平滑如镜海面反射的光华。在璀璨昏星的上方,则可见到明亮的木星。纳米比亚骷髅海岸名称的来由,是因为沿岸从前散布着大量海豹和鲸鱼骨骸,在较晚近的这段时期,则以有众多沉船而著称。



2018 年11 月25 日 
See Explanation. Clicking on the picture will download the highest resolution version available.

火卫一:注定灭亡的卫星 
影像提供: Viking Project , JPL , NASA ; Mosaic Processing: Edwin V. Bell II ( NSSDC / Raytheon ITSS)




说明: 这颗卫星在劫难逃。罗马神话战神为名的火星,拥有两颗名为火卫一火卫二的小卫星,其名称的希腊文义分别是恐惧和恐慌这两颗火星卫星的来处不明,但最广被接受的假说指称,它可能是被火星捕获的小行星。由火星海盗1号探测船在1978年拍摄的这张假色影像,所呈现宽约25公里的较大火卫一,还真的看起来很像是一颗满布撞击坑的的小行星最近针对火卫一上的不寻常颀长沟渠进行的分析显示,它们可能是圆石从造成左上角史蒂克妮陨石坑的强烈撞击滚开时,所碾压出来的。 火卫一轨道非常接近火星,只有5800公里,相较之下,月球和地球间距有40万公里。因此,火星无情的引潮力正把火卫一向下拉,再过5千万年左右,还在轨道上的火卫一可能会发生崩解,然后再掉到火星表面。不过远坠落发生之前在的明天,如果一切如计画进行无误的话,美国航太总署的洞察号着陆器将降落在火星上,并开始探索它的内部结构。




上述文字信息来自成大物理分站翻译。


 


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