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Observation of the A Carinid Meteor Shower 2020 Unexpected Outburst
The Planetary Science Journal Pub Date : 2021-03-16 , DOI: 10.3847/psj/abe9af
Juan Sebastian Bruzzone 1, 2 , Robert J. Weryk 2, 3 , Diego Janches 2 , Carsten Baumann 4 , Gunter Stober 5 , Jose Luis Hormaechea 6, 7
Affiliation  

We present observations of the sudden outburst of the A 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 2020 October 14 and lasted 7 days (199 ≤ λ ≤ 205), with a mean Sun-centered geocentric ecliptic radiant of λ g λ = 271.04, β g = −76.4, and a geocentric speed of 33.3 km s−1. Assuming a mass index value of s = 2.0, we compute a peak 24 hr average flux of 0.029 meteoroids 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 ∼44, well below the activity of other strong showers. The mean orbital elements resemble those of a short-period object, a = 3.5 0.1 au, q ≃ 1 au, e = 0.72 0.02, i = 55.8 0.3, ω = 1 173, and Ω = 21.7, 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 catalogs.



中文翻译:

对 2020 年一次 Carinid 流星雨意外爆发的观测

我们记录了与阿根廷南部敏捷流星雷达轨道系统(SAAMER-OS)附近的南环零星区域的一个Carinid流星雨的爆发突然的本意见。于2020 21年10月14日UT和22 UT之间的突出达到顶峰,并历时7天(199≤ λ ≤205),具有的平均太阳为中心的地心黄道辐射λ - λ = 271.04,β= -76.4,和33.3公里的地心速度S -1。假设的质量指数值小号= 2.0,我们计算0.029流星公里的峰值24小时的平均通量-2小时-1 到9等的限制,这相当于5.7每小时天顶流星数(ZHR)和媲美其他既定淋浴类似的质量指标。通过进一步估算等典型质量指数值的峰值通量,我们发现,爆发可能永远超过~44的最大ZHR,远低于其他强阵雨的活性。平均轨道要素类似于那些短周期的对象,一个= 3.5 0.1 AU,q ≃1个AU,Ë = 0.72 0.02,= 55.8 0.3,ω = 1 173和Ω= 21.7,和类似于那些衍生在南部的高纬度黄道带SAAMER-OS观察前两个淋浴爆发。使用$D^{\prime} $ 标准并没有透露与此沐浴在已知对象的目录相关的父对象。

更新日期:2021-03-16
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