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arXiv 1507.08459astro-ph.EP
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PF131010 Ciechanow火球-可能与近地小行星2010 TB54和2010 SX11有关的天体

PF131010 Ciechanow fireball - the body possible related to Near Earth Asteroids 2010 TB54 and 2010 SX11

A. Olech, P. Zoladek, M. Wisniewski, R. Rudawska, J. Laskowski, K. Polakowski, M. Maciejewski, T. Krzyzanowski, T. Fajfer, Z. Tyminski

摘要:

2010年10月13日,阿波罗型20米小行星2010 TB 54在距离地球6.1个月球的距离内通过。在同一天,但11.4小时前,正好在02:52:32 UT,波兰中部的天空被-8.6级PF 131010 Ciechanow火球照亮。利用波兰火球网(PFN)的多站数据计算了火球的轨迹和轨道。结果表明,造成PF 131010火球的流星体的轨道与2010 TB 54小行星的轨道相似,两者可能相关。此外,在切哈诺火球出现的两天前,另一颗被命名为2010 SX 11的小行星从地月系统附近经过。它的轨道比2010 TB 54更接近切哈诺火球母天体的轨道。PF 131010 Ciechanow以12.9 ± 0.2 km/s的速度进入地球大气层,并在82.5 ± 0.3 km的高度开始发光。在飞行的最初三秒后开始明显减速,流星的终极速度在29.3 ± 0.1公里的高度仅为5.8 ± 0.2公里/秒。如此低的终极速度值表明,总质量约为2公斤的碎片可以在大气层中幸存下来,并导致陨石坠落。预测的可能陨石撞击的区域被计算出来,它位于Ostroleka市南部的Grabowo村附近。

英文摘要:

On 2010 October 13, the Apollo type 20-meter asteroid 2010 TB54 passed within 6.1 lunar distances from the Earth. On the same date, but 11.4 hours earlier, exactly at 02:52:32 UT, the sky over central Poland was illuminated by -8.6 magnitude PF131010 Ciechanow fireball. The trajectory and orbit of the fireball was computed using multi-station data of Polish Fireball Network (PFN). The results indicate that the orbit of the meteoroid which caused the PF131010 fireball is similar to the orbit of 2010 TB54 asteroid and both bodies may be related. Moreover, two days before appearance of Ciechanow fireball another small asteroid denoted as 2010 SX11 passed close to the Earth-Moon system. Its orbit is even more similar to the orbit of Ciechanow fireball parent body than in case of 2010 TB54. The PF131010 Ciechanow entered Earth's atmosphere with the velocity of 12.9 +\- 0.2 km/s and started to shine at height of 82.5 +\- 0.3 km. Clear deceleration started after first three seconds of flight, and the terminal velocity of the meteor was only 5.8 +\- 0.2 km/s at height of 29.3 +\- 0.1 km. Such a low value of terminal velocity indicates that fragments with total mass of around 2 kg could survive the atmospheric passage and cause fall of the meteorites. The predicted area of possible meteorite impact is computed and it is located near Grabowo village south of Ostroleka city.

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