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2022-03-05
2022年03月05日:从星际空间来的博里索夫彗星-(Interstellar Comet 2I Borisov)
2022年03月05日:从星际空间来的博里索夫彗星-(Interstellar Comet 2I Borisov)--原图下载{mtitle title="从星际空间来的博里索夫彗星"/}Image Credit: NASA, ESA, and D.Jewitt (UCLA) et al.说明: 来自银河系某处的博里索夫彗星(2I/Borisov),在造访太阳系后刚离开。这二幅分别由哈伯太空望远镜摄于2019年11月及12月的影像,呈现由业余天文学家博里索夫发现于2019年8月30日、首颗获得确认的星际彗星。在上左图里,位在博里索夫彗星视线方向的背景星系,因为拍摄这张影像时,是以这颗当时距离约3亿2千7百万公里远的快速移动彗星及尘埃尾为导星标的,因而其身影看来很模糊。上右图,则呈现刚通近日点后的博里索夫彗星。欧南天文台的观测指出,这颗彗星在2019年近距离掠过太阳之前,可能从未通过任何恒星附近。博里索夫彗星在2019年12月28日,以大约2亿9千万公里的间距掠过地球附近。虽然哈伯的清晰影像并未能解析出这颗彗星的彗核,然而据此可估计出其直径为小于1公里。{lamp/}原文:{mtitle title="Interstellar Comet 2I Borisov"/}Image Credit: NASA, ESA, and D.Jewitt (UCLA) et al.Explanation: From somewhere elsein the Milky Way galaxy,Comet 2I/Borisovwas just visiting the Solar System.Discovered by amateur astronomer Gennady Borisovon August 30, 2019, the first known interstellar cometis seen in these two Hubble Space Telescope imagesfrom November and December 2019.On the left, a distant background galaxy near the line-of-sight toBorisov is blurred asHubbletracked the speeding comet and dust tail about327 million kilometers from Earth.At right, 2I/Borisov appears shortly after perihelion, its closestapproach to Sun.European Southern Observatoryobservations indicatethat this comet may never have passed closeto any star before its 2019 perihelion passage.Borisov's closestapproach to our fair planet, a distance of about 290 millionkilometers, came on December 28, 2019.Even though Hubble's sharp images don't resolve the comet's nucleus,they did lead to estimates of less than 1 kilometer for its diameter.
2022年03月05日
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2019-12-14
2019年12月14日:星际空间来的博里索夫彗星-(Interstellar Comet 2I/Borisov)
2019年12月14日:星际空间来的博里索夫彗星-(Interstellar Comet 2I/Borisov)--原图下载{mtitle title="星际空间来的博里索夫彗星"/}Image Credit: NASA, ESA, and D. Jewitt (UCLA) et al.说明: 来自银河系某处的博里索夫彗星(2I/Borisov),目前正在造访太阳系。这二幅最近由哈伯太空望远镜拍摄的影像,记录了克里米亚业余天文学家博里索夫发现于8月30日,首颗获得确认的星际彗星。在上左图里,一个位在博里索夫彗星视线方向的背景星系,因为影像拍摄是以这颗当时距离约3亿2千7百万公里远,快速移动的彗星和尘埃尾为导星标的,而显着模糊晕开。上右图,则呈现刚通近日点的博里索夫彗星。博里索夫彗星将在12月28日,行进到最靠近地球,距离约2亿9千万公里远的位置。虽然哈伯的清晰影像,并未能解析出彗星的彗核,然而据而估计出的直径为小于1公里。{lamp/}原文:{mtitle title="Interstellar Comet 2I/Borisov"/}Image Credit: NASA, ESA, and D. Jewitt (UCLA) et al.Explanation: From somewhere elsein the Milky Way galaxy,Comet 2I/Borisov is just visiting the Solar System.Discovered byCrimean amateur astronomer Gennady Borisovon August 30, 2019, the first known interstellar cometis captured in these two recentHubble Space Telescope images.On the left, a distant background galaxy near the line-of-sight toBorisov is blurred asHubble tracked the speeding comet and dust tail about327 million kilometers from Earth.At right, 2I/Borisov appears shortly after perihelion, its closestapproach to Sun.Borisov's closestapproach to our fair planet, a distance of about 290 millionkilometers, will come on December 28.Even though Hubble's sharp images don't resolve the comet's nucleus,they do lead to estimates of less than 1 kilometer for its diameter.
2019年12月14日
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2019-10-18
2019年10月18日:来自星际空间的博里索夫彗星-(Interstellar Interloper 2I/Borisov)
2019年10月18日:来自星际空间的博里索夫彗星-(Interstellar Interloper 2I/Borisov)--原图下载{mtitle title="来自星际空间的博里索夫彗星"/}Image Credit: NASA, ESA, and D.Jewitt (UCLA)et al.说明: 自2017年侦测到斥候星(1I/'Oumuamua)之后,博里索夫彗星(2I/Borisov)成为第二颗确认来自星际空间的访客。就像斥候星,博里索夫彗星的双曲线轨迹和掉向太阳的速率,让我们得以确认它是源自太阳系外头的天体。不过详细的观测指出,石质的斥候星和现知太阳系天体有不少的差异,然而来自深空的博里索夫彗星,则是颗不折不扣的彗星。这幅2019年10月12日,由哈伯太空望远镜拍摄的博里索夫彗星影像,显示它具有我们很熟悉的彗星活动,彗核的周围也聚集着尘埃。虽然这张影像并未解析出彗核,但据估计彗核的直径介于2到16公里之间。在哈伯取像之时,博里索夫彗星的距离大约有4亿1千8百万公里远。博里索夫彗星仍在靠近之中,将在12月7日,运行到距离约3亿公里(2天文单位)的最近太阳位置。{lamp/}原文:{mtitle title="Interstellar Interloper 2I/Borisov"/}Image Credit: NASA, ESA, and D.Jewitt (UCLA)et al.Explanation: After the 2017 detecton of 1I/'Oumuamua,comet2I/Borisov has becomethe second recognized interstellar interloper.Like 'Oumuamua, Borisov's measured hyperbolic trajectory and speed asit falls toward the Sun confirm that its origin is frombeyond our Solar System.But while detailed observations indicate'Oumuamua is a rocky bodywith differences from known Solar System objects,Borisov is definitely a far wandering comet.Taken on October 12, 2019 thisHubble Space Telescope image of Borisovreveals a familiar looking comet-like activityand concentration of dust around around its nucleus.Not resolved in the image, some estimates suggest the nucleus could bebetween 2 and 16 kilometers in diameter.At the time of the Hubble image,comet 2I/Borisov was about 418 million kilometers away.Borisov is still inbound though and will make its closest approachto the Sun on December 7 ata distance of about 300 million kilometers (2 Astronomical units).
2019年10月18日
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