2011/12/15 COMET LOVEJOY UPDATE: Matthew Knight of the Lowell Observatory and JHU-APL reports: "As of 16:30 UT on Dec. 15th, Comet Lovejoy has reached magnitude -3, possibly brighter. It is starting to saturate SOHO images even with narrow filters and shorter than normal exposure times." The comet is now brighter than Jupiter, but not quite as bright as Venus. If these developments continue apace, Comet Lovejoy could become visible to the naked eye in broad daylight before the end of Dec. 15th. See the news item below for further discussion of this possibility. 在UTC12/15 16:30時，這顆彗星的亮度達到-3等或是更亮...(略) 若是亮度持續增加，12/15結束以前的白天有機會直接看見 2011/12/16 COMET LOVEJOY SURVIVES: Incredibly, sungrazing Comet Lovejoy appears to have survived its close encounter with the sun. Lovejoy flew only 140,000 km over the stellar surface during the early hours of Dec. 16th. NASA's Solar Dynamics Observatory caught the comet emerging from perihelion (closest approach). Curiously, the comet seems to have lost its tail in transit through the sun's atmosphere. A decapitated remnant tail can still be seen tracing Comet Lovejoy's path into the sun, but the exiting comet has no obvious trail of dust behind it. 在12/16稍早的時間，彗星Lovejoy以只有140,000公里的近距離掠過太陽，並且難以置信 地存活下來。SDO捕捉到了通過近日點後再度出現的彗星。 奇特的是，彗星在經過太陽大氣層時失去了尾巴。進入太陽背面前遺留的彗尾痕跡仍可 以看見，但出來的彗星背後已經沒有明顯的塵埃尾跡。 http://spaceweather.com/archive.php?view=1&day=15&month=12&year=2011 http://spaceweather.com/archive.php?view=1&day=16&month=12&year=2011 SOHO的LASCO C3視野中可以很明顯地看見彗星進入太陽背面以及出現 http://spaceweather.com/images2011/16dec11/lovejoy_c3_anim.gif SDO影像中顯示彗星近掠太陽時忍受的坎坷之路 http://spaceweather.com/images2011/16dec11/ipad/comet_whoosh.m4v SDO影像捕捉到通過近日點後再度出現的彗星Lovejoy http://sdoisgo.blogspot.com/2011/12/phoenix-comet-emerges.html --

※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.112.252.177 ※ 編輯: jses1 來自: 140.112.252.177 (12/16 20:39)