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2024-01-16
2024年01月16日:肉眼几乎可见的猎户座-(The Orion You Can Almost See)
[2024年01月16日:肉眼几乎可见的猎户座-(The Orion You Can Almost See)--原图下载](https://apod.nasa.gov/apod/image/2401/OrionMcc_Guzzini_1366.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2401/OrionMcc_Guzzini_960_annotated.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2401/OrionMcc_Guzzini_960.jpg';){mtitle title="肉眼几乎可见的猎户座"/}Image Credit & Copyright: Michele Guzzini说明: 你认得这个星座吗?儘管它是天空中最容易辨认的星群之一,但这种与肉眼所见比较更加完整的猎户座,只有透过长曝光数位相机成像及电脑后製处理才得以显现。在此影像里,带着深橙色调的低温红巨星参宿四,是位于左上角的最明亮恒星。猎户座的炽热泛蓝恒星数量众多,其中,右下角的超巨星参宿七,亮度足以和左上角的参宿四相抗衡,而右上角的亮星则是参宿五。距离我们全约为1,500光年远的猎户腰带三星,皆诞生于猎户座备受研究的星际云里。猎户腰带下方有一片明亮但模糊的光斑,它看来或许也有点眼熟,这是因为它是名为猎户大星云的恒星孕育室。最后是肉眼勉强可见但相当引人注目的巴纳德环,这团环拱在猎户腰带和猎户大星云周围的庞大发射星云,是由猎户座摄影先锋巴纳德发现于100多年前。(Betelgeuse 参宿四; Rigel 参宿七; Bellatrix 参宿五; Barnard's Loop 巴纳德环; Hatysa 伐三; Alnitak 参宿一; Alnilam 参宿二; Mintaka 参宿三; Saiph 参宿六; Cursa 玉井三-波江座){lamp/}原文:{mtitle title="The Orion You Can Almost See"/}Image Credit & Copyright: Michele GuzziniExplanation: Do you recognize this constellation? Although it is one of the most recognizable star groupings on the sky, this is a more full Orion than you can see -- an Orion only revealed with long exposure digital camera imaging and post-processing. Here the cool red giant Betelgeuse takes on a strong orange tint as the brightest star on the upper left. Orion's hot blue stars are numerous, with supergiant Rigel balancing Betelgeuse on the lower right, and Bellatrix at the upper right.Lined up in Orion's belt are three stars all about 1,500 light-years away, born from the constellation's well-studied interstellar clouds.Just below Orion's belt is a bright but fuzzy patch that might also look familiar -- the stellar nursery known as Orion's Nebula. Finally, just barely visible to the unaided eye but quite striking here is Barnard's Loop -- a huge gaseous emission nebula surrounding Orion's Belt and Nebula discovered over 100 years ago by the pioneering Orion photographer E. E. Barnard.
2024年01月16日
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2020-02-17
2020年02月17日:参宿四的表面变化-(The Changing Surface of Fading Betelgeuse)
2020年02月17日:参宿四的表面变化-(The Changing Surface of Fading Betelgeuse)--原图下载{mtitle title="参宿四的表面变化"/}Image Credit: ESO, M. Montargès et al.说明: 参宿四除了变暗之外,它的外观也有改变吗?的确有。这颗猎户座的着名红超巨星极为庞大,就连地面望远镜都能勉强解析出它的表面。这二幅由欧南天文台.极大望远镜拍摄的主题影像,呈现了这颗恒星在去年初和年底的样貌。左侧的影像显示,年初时参宿四的亮度远较年底时均匀,而右侧的影像显示,年底时参宿四下半部比上半部暗很多。此外,去年头五个月的业余观测指出,参宿四的亮度反而稍有增加,不过它在年底的最后五个月却突然大幅变暗。对这颗着名超巨变星来说,这种变化可能只是正常行为,然而最近的变暗,却重新炒热关于参宿四何时会发生超新星爆炸的讨论。因为参宿四离我们约700光年远,这个可能发生在数千年后的超新星事件,届时对地球上的生命并无威胁,可能只是夜空的奇景而已。{lamp/}原文:{mtitle title="The Changing Surface of Fading Betelgeuse"/}Image Credit: ESO, M. Montargès et al.Explanation: Besides fading, is Betelgeuse changing its appearance?Yes.The famous red supergiant star in the familiar constellation of Orion is so large that telescopes on Earth can actually resolve its surface -- although just barely.The two featured images taken with the European Southern Observatory's Very Large Telescope show how the star's surface appeared during the beginning and end of last year. The earlier image shows Betelgeuse having a much more uniform brightness than the later one, while the lower half of Betelgeuse became significantly dimmer than the top.Now during the first five months of 2019 amateur observations show Betelgeuse actually got slightly brighter, while in the last five months the star dimmed dramatically.Such variability is likely just normal behavior for this famously variable supergiant, but the recent dimming has rekindled discussion on how long it may be before Betelgeuse does go supernova.Since Betelgeuse is about 700 light years away, its eventual supernova -- probably thousands of years in the future -- will likely be an amazing night-sky spectacle, but will not endanger life on Earth.
2020年02月17日
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2020-01-01
2020年01月01日:狂想参宿四-(Betelgeuse Imagined)
2020年01月01日:狂想参宿四-(Betelgeuse Imagined)--原图下载2020年01月01日:狂想参宿四-(Betelgeuse Imagined)--原图下载{mtitle title="狂想参宿四"/}Illustration Credit: ESO, L. Calcada说明: 为何参宿四会变暗?没人知道原因。参宿四是地球天空中最亮和最易辨识的数颗恒星之一,不过,它目前的亮度只有5个月前之半。对这颗着名的超巨变星而言,或许这种变异性只是正常而已,然而它最近变暗的行为,却重新炒热参宿四何时会发生超新星爆炸的讨论。以色泽泛红着称的参宿四,是现代望远镜勉强可以解析的寥寥数颗恒星之一。这幅画家绘製的主题图示,想像当近距离观看参宿四或许能见到的面貌。参宿四咸认应有个複杂而湍动的表面,常常喷出大规模的闪焰。如果把太阳换成参宿四(万万不可啊!),它的表面会伸展到木星轨道附近,而它湍动的羽状云,会喷洒到海王星的后方。因为参宿四的距离约有700光年远,当它发生超新星爆炸时,纵然亮度可以和满月争辉,但并不会危及地球上的生命。而在这个2020年代,不管是业余或专业天文学家,必然会持续监测参宿四。{lamp/}原文:{mtitle title="Betelgeuse Imagined"/}Illustration Credit: ESO, L. CalcadaExplanation: Why is Betelgeuse fading? No one knows. Betelgeuse, one of the brightest and most recognized stars in the night sky, is only half as bright as it used to be only five months ago. Such variability is likely just normal behavior for this famously variable supergiant, but the recent dimming has rekindled discussion on how long it may be beforeBetelgeuse does go supernova. Known for its red color, Betelgeuse is one of the few stars to be resolved by modern telescopes, although only barely. The featured artist's illustration imagines how Betelgeuse might look up close.Betelgeuse is thought to have a complex and tumultuous surface that frequently throws impressive flares. Were it to replace the Sun (not recommended), its surface would extend out near the orbit of Jupiter, while gas plumes would bubble out past Neptune. Since Betelgeuse is about 700 light years away, its eventual supernova will not endanger life on Earth even though its brightness may rival that of a full Moon. Astronomers -- both amateur and professional -- will surely continue to monitor Betelgeuse as this new decade unfolds.
2020年01月01日
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2019-08-21
2019年08月21日:肉眼几乎可见的猎户座-(The Orion You Can Almost See)
[2019年08月21日:肉眼几乎可见的猎户座-(The Orion You Can Almost See)--原图下载](https://apod.nasa.gov/apod/image/1908/OrionDeep_GleasonAndreo_2048.jpg"onMouseOver="if (document.images)document.imagename1.src='image/1908/OrionDeep_GleasonAndreo_1080_annotated.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/1908/OrionDeep_GleasonAndreo_1080.jpg';){mtitle title="肉眼几乎可见的猎户座"/}Image Credit & Copyright: John Gleason&RogelioBernal Andreo说明: 你认得这个星座吗?纵然它是地球天空中,最容易辨识的星群之一,但这幅使用数位相机进行长曝光成像及后续影像处理的影像,呈现的猎户座超出人类肉眼所能见。在影像中,低温的红巨星参宿四,是左下角带着鲜明橙色的最明亮恒星。猎户座里有难以数计的炽热泛蓝恒星,其中有位在右上角和参宿四斜角对峙的超巨星参宿七,以及左上角的参宿五。而构成猎户腰带的腰带三星,距离都在1,500光年上下,全都诞生于这个星座被研究得很透澈的星际云里。猎户腰带右方的泛红弥漫光斑,或许看来有些眼熟,因为它就是猎户大星云。最后,肉眼勉强可见,但在这幅影像里却是无比醒目的巴纳德圈,是个环拱猎户腰带和猎户大星云的庞大发射云弧,由首先为猎户座造像的摄影师巴纳德,发现于100多年前。{lamp/}原文:{mtitle title="The Orion You Can Almost See"/}Image Credit & Copyright: John Gleason&RogelioBernal AndreoExplanation: Do you recognize this constellation? Although it is one of the most recognizable star groupings on the sky, this is a more full Orion than you can see -- an Orion only revealed with long exposure digital camera imaging and post-processing. Here the cool red giant Betelgeuse takes on a strong orange tint as the brightest star at the lower left. Orion's hot blue stars are numerous, with supergiant Rigel balancing Betelgeuse on the upper right, and Bellatrix at the upper left.Lined up in Orion's belt are three stars all about 1,500 light-years away, born from the constellation's well-studied interstellar clouds.To the right of Orion's belt is a bright but fuzzy patch that might also look familiar -- the stellar nursery known as Orion's Nebula. Finally, just barely visible to the unaided eye but quite striking here is Barnard's Loop -- a huge gaseous emission nebula surrounding Orion's Belt and Nebula discovered over 100 years ago by the pioneering Orion photographer E. E. Barnard.
2019年08月21日
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