彗翎

彗翎（也稱逆向彗尾或反尾）是從彗星的彗髮投射出來的明顯的尖峰，它似乎朝向太陽，因此在幾何上與另一個彗尾相反：離子尾和塵埃尾。然而，這種現象是從地球上看到的視錯覺。彗翎是由更大的塵埃顆粒組成，它們受太陽輻射壓力的影響較小，並傾向於大致保持在彗星的軌道平面內，最終由於顆粒從彗星表面噴出的速度而沿彗星軌道形成盤狀。當地球穿過彗星的軌道平面時，是由側面看見這一盤面，並表現為特徵性的尖峰^[1]。儘管盤的另一面往往會消失在塵埃的尾部，但有時仍可以看到。因此，通常只有當地球穿過彗星的軌道平面時，才能在短時間內看到彗翎^[2]^[3]。

大多數彗星都沒有發育到足以看到彗翎的程度，但值得注意的是，確實顯示出彗翎的彗星包括1957年的阿蘭德-羅蘭彗星、1973年的柯侯德彗星^[4]、1997年的海爾·波普彗星、和2013年的泛星彗星。

註解

^ Encyclopedia of science:antitail. ^{[失效連結]}
^ Rao, Joe. Newfound Comet Lulin to Grace Night Skies. SPACE.com. 6 February 2009 [2009-02-25]. （原始內容存檔於26 February 2009）.
^ Tosar, Borja; Paolo Candy. What is an antitail. 3.bp.blogspot. [2009-02-25]. （原始內容存檔於25 February 2009）.
^ Naugles, John E. Statement of John E. Naugle, Associate Administrator for Space Science, NASA: Comet Kohoutek Program. Committee on Science and Astronautics U.S. House of Representatives. Hearings Before the Subcommittee on Space Science and Applications (Washington DC). 7 March 1974, 25 (3): 401 [2021-11-10]. [drawing on page 403] the Skylab crewmen observed a brilliant spike or anti tail projecting toward the Sun from the head of Kohoutek [...] Dr Zdenek Sekanina concluded that the spike was not wholly due to a perspective or geometrical effect as has been assumed in previous comet studies.

有着突出彗翎的阿蘭德·羅蘭彗星影像。（頁面存檔備份，存於互聯網檔案館）

外部連結

Emily Lakdawalla. Got binoculars? Spot a comet near Saturn tonight. 2009-02-23 [2023-01-27]. （原始內容存檔於2014-04-22）.
Online Encyclopedia of Science - Antitail （頁面存檔備份，存於互聯網檔案館）

[1] Encyclopedia of science:antitail. ^{[失效連結]}

[2] Rao, Joe. Newfound Comet Lulin to Grace Night Skies. SPACE.com. 6 February 2009 [2009-02-25]. （原始內容存檔於26 February 2009）.

[3] Tosar, Borja; Paolo Candy. What is an antitail. 3.bp.blogspot. [2009-02-25]. （原始內容存檔於25 February 2009）.

[4] Naugles, John E. Statement of John E. Naugle, Associate Administrator for Space Science, NASA: Comet Kohoutek Program. Committee on Science and Astronautics U.S. House of Representatives. Hearings Before the Subcommittee on Space Science and Applications (Washington DC). 7 March 1974, 25 (3): 401 [2021-11-10]. [drawing on page 403] the Skylab crewmen observed a brilliant spike or anti tail projecting toward the Sun from the head of Kohoutek [...] Dr Zdenek Sekanina concluded that the spike was not wholly due to a perspective or geometrical effect as has been assumed in previous comet studies.

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彗翎

相關條目

註解

外部連結