彗星 41p 改變旋轉方向

[peter]

 彗星 41p  改變旋轉方向
==

41p

http://www.aerith.net/comet/catalog/0041P/2017.html




2017 list

http://familystar.org.tw/index.php?option=com_smf&Itemid=45&topic=24999.0

==

http://www.skyandtelescope.com/observing/worldwide-4p-comet-campaign-needs-your-photos/



Comet 41P/Tuttle-Giacobini-Kresak begins the year moving north along the Leo-Cancer border, where it's well-placed for viewing in the evening sky. Watch for the comet to brighten from about magnitude +12 in mid-January to +10 by early March. Click for a full-size, printable finder chart.
Sky & Telescope diagram



Comet 41P/T-G-K passes closest to Earth (0.14 AU) in late March,

[peter]

 彗星 41p  改變旋轉方向 

https://tam.gov.taipei/News_Content.aspx?n=EF86D8AF23B9A85B&sms=F32C4FF0AC5C2801&s=3A6D2B770175785F



https://www.cnbeta.com.tw/articles/science/1555720.htm#google_vignette

就在它最近一次靠近太阳时， 家们发现，它的自转速度突然慢了三倍。
 
这还没完，不久之后，它的转速越来越慢，最后直接反向旋转了。

但是经过分析，彗星“掉头”的原因其实非常简单：
彗星靠近太阳被加热，表面的冰被快速升华，喷射出大量气体，就像一个小型的“推进器”，硬生生把彗星扭转了方向。