PF191012 Myszyniec -有史以来最高的猎户座流星
PF191012 Myszyniec - highest Orionid meteor ever recorded
摘要：
在2012年10月18/19日晚上00：23 UT，一个-14.7等的猎户座火球发生在波兰东北部。根据波兰火球网（PFN）的五个视频和一个摄影站收集的数据，给出了该事件的精确轨道和大气轨迹。该流星的起始高度为168.4 + 0.6公里，这使得PF 191012 Myszyniec火球成为有史以来观测到的最高的流星，有据可查，不属于狮子座流星雨。在大约115公里的高度，烧蚀成为流星的主要光源。溅射粒子的热化被认为是高于该值的辐射源。115公里的过渡高度比狮子座流星雨的过渡高度低10-15公里，这可能表明狮子座流星雨的物质应该比猎户座流星雨更脆弱，体积密度可能更小。
英文摘要：
On the night of Oct 18/19, 2012 at 00:23 UT a -14.7 mag Orionid fireball occurred over northeastern Poland. The precise orbit and atmospheric trajectory of the event is presented, based on the data collected by five video and one photographic Polish Fireball Network (PFN) stations. The beginning height of the meteor is 168.4 +\- 0.6 km which makes the PF191012 Myszyniec fireball the highest ever observed, well documented meteor not belonging to the Leonid shower. The ablation became the dominant source of light of the meteor at a height of around 115 km. The thermalization of sputtered particles is suggested to be the source of radiation above that value. The transition height of 115 km is 10-15 km below the transition heights derived for Leonids and it might suggest that the material of Leonids should be more fragile and have probably smaller bulk density than in case of Orionids.
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