来自捷克共和国2019年爆发观测的Alpha Monocerotid流星的特性
Properties of Alpha Monocerotid meteors from the observation of the 2019 outburst in the Czech Republic
摘要：
我们用现代化的摄像机和摄影机观测了预测的2019年11月22日Alpha Monocerotid（AMO）流星雨的爆发。由于爆发的持续时间短，强度适中，因此只获得了10颗流星的大气轨迹和辐射量，其中7颗包括速度、星等和轨道。此外，还捕获了一个不完整的视频频谱。辐射量和轨道被发现与1995年爆发的辐射量和轨道是一致的。光谱证实AMO流星体缺乏钠。与其他任何流星雨不同，发现流星末端高度分布在90公里的恒定水平上，所有流星的星等在+4和-2之间，大气轨道长度达40公里。我们认为，α Monocerotid形成于一个脱挥发分和脆弱的彗星地壳组成的相对较大的基本颗粒。
英文摘要：
We observed the predicted outburst of the Alpha Monocerotid (AMO) meteor shower on 2019 November 22 with our modernized video and photographic cameras. Due to the short duration and moderate intensity of the outburst, atmospheric trajectories and radiants were obtained for only ten meteors, seven of which included velocities, magnitudes, and orbits. In addition, one incomplete video spectrum was captured. The radiants and orbits were found to be compatible with that of the 1995 outburst. The spectrum confirmed that AMO meteoroids are deficient in sodium. Unlike any other meteor shower, meteor end heights were found to be distributed along a constant level of 90 km for all meteors with magnitudes between +4 and -2 and with atmospheric trajectory lengths up to 40 km. We propose that Alpha Monocerotids were formed from a devolatilized and fragile cometary crust composed from relatively large fundamental grains.
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