A strong and unexpected meteor shower outburst was observed by the Southern Argentina Agile MEteor Radar Orbital System (SAAMER-OS) at high southern ecliptic latitude within the South Toroidal region. The outburst, which was active throughout solar longitudes 351° and 352°, peaked at 09:30 UT on 2020 March 12, has a mean Sun-centered ecliptic radiant of λ − λ 0 ∼ 307.°5 and β ∼ −77.°2 and a geocentric velocity of 30.7 km s −1 . Using the ##IMG## [http://ej.iop.org/images/2041-8205/895/1/L25/apjlab9181ieqn1.gif] {$D^{\prime} $} parameter criterion, we find the corresponding orbital elements of the outburst to match well with both the β Tucanid and δ Mensid meteor showers, suggesting these are in fact the same shower. We also find a promising parent candidate in asteroid (248590) 2006 CS, a large ( D ∼ 2 km) highly inclined 52° near-Earth object.

中文翻译：

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高黄纬南纬意外流星爆发的观测及其潜在成因。

阿根廷南部敏捷的流星雷达轨道系统（SAAMER-OS）在南环形区域内的南黄道高纬度处观测到强烈而出乎意料的流星雨爆发。该爆发在整个太阳经度351°和352°上都活跃，于2020年3月12日的UT在09:30达到峰值，其平均以太阳为中心的黄道辐射为λ-λ0〜307.°5和β〜-77。 °2，地心速度为30.7 km s -1。使用## IMG ## [http://ej.iop.org/images/2041-8205/895/1/L25/apjlab9181ieqn1.gif] {$ D ^ {\ prime} $}参数标准，我们找到了爆发的相应轨道元素与β杜卡尼德流星雨和δMensid流星雨都很好地匹配，这表明它们实际上是同一阵雨。我们还在小行星（248590）2006 CS中找到了有希望的父代候选物，这是一个大的（D〜2 km）高度倾斜的52°近地天体。