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arXiv 2102.13043astro-ph.EP
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对$α$ Carinid流星雨2020年意外爆发的观测

Observation of the $α$ Carinid meteor shower 2020 unexpected outburst

Juan Sebastian Bruzzone, Robert Weryk, Diego Janches, Carsten Baumann, Gunter Stober, Jose Luis Hormaechea

摘要:

我们目前的观测突然爆发的$α$ Carinid流星雨记录与南阿根廷敏捷MEteor雷达轨道系统(SAAMER-OS)附近的南环零星地区。爆发在2020年10月14日21 UT和22 UT之间达到峰值,持续了7天的$(199^{\circ}\leqλ_{\odot}\leq 205^{\circ})$,平均日心黄道辐射量为$λ_{g}-λ_{\odot}=271^{\circ}.04$,$β_{g}=-76^{\circ}.4$,地心速度为33.3 km s $^{-1}$。假设$s=2.0$的质量指数值,我们计算出峰值24小时平均通量为0.029 met。km $^{-2}$ hr $^{-1}$达到9等的极限,相当于天顶每小时速率(ZHR)为5.7,与其他具有类似质量指数的已建立阵雨相当。通过进一步估计其他典型的质量指数值的峰值通量,我们发现,爆发可能从来没有超过$\sim44$的最大ZHR,远低于其他强阵雨的活动。平均轨道要素类似于短周期天体:$a=3.5\pm0.1$ au、$q\simeq 1$ au、$e=0.72\pm0.02$、$i=55^{\circ}.8\pm0^{\circ}.3$、$ω=1^{\circ}\pm 173^{\circ}$、$Ω=21^{\circ}.7$,并且与SAAMER-OS在南黄道高纬度观测到的前两次阵雨爆发的结果相似。使用$D^{\prime}$标准并没有在已知的天体目录中发现与这场流星雨有关的父天体。

英文摘要:

We present observations of the sudden outburst of the $α$ Carinid meteor shower recorded with the Southern Argentina Agile MEteor Radar-Orbital System (SAAMER-OS) near the South Toroidal sporadic region. The outburst peaked between 21 UT and 22 UT on October 14, 2020 and lasted 7 days $(199^{\circ}\leqλ_{\odot}\leq 205^{\circ})$ with a mean Sun-centered geocentric ecliptic radiant of $λ_{g}-λ_{\odot}=271^{\circ}.04$, $β_{g}=-76^{\circ}.4$, and a geocentric speed of 33.3 km s$^{-1}$. Assuming a mass index value of $s=2.0$, we compute a peak 24 hour-average flux of 0.029 met. km$^{-2}$ hr$^{-1}$ to a limit of 9th magnitude, which is equivalent to a zenithal hourly rate (ZHR) of 5.7, and comparable to other established showers with similar mass indices. By further estimating the peak fluxes for other typical mass index values, we find that the outburst likely never exceeded a maximum ZHR of $\sim44$, well below the activity of other strong showers. The mean orbital elements resemble those of a short-period object: $a=3.5\pm0.1$ au, $q\simeq 1$ au, $e=0.72\pm0.02$, $i=55^{\circ}.8\pm0^{\circ}.3$, $ω=1^{\circ}\pm 173^{\circ}$, $Ω=21^{\circ}.7$, and are similar to those derived for two previous shower outbursts observed with SAAMER-OS at high southern ecliptic latitudes. Using the $D^{\prime}$ criterion did not reveal a parent object associated with this shower in the known object catalogues.

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