![]() This camera is a Watec 902 Ultimate, the lens a Computar 1:0.8, facing SE with a fov 67.2° × 89.2° and a resolution of 7.8’/pixel, located at Campos dos Goytacazes city. Carlos Henrique operates the ROC1 camera remotely. Both have a 1/3” sensor and a Fujinon F0.95 lens, adapted to meteor video registration, SJU1 facing SO direction with a fov of 48.9° × 64.3°and resolution of 5.9’/pixel, and SJU2 facing NE with a fov of 45.7° × 61.3° and resolution of 5.1’/pixel, both from the same place at São João de Uba city. Marcelo Mozer operates the SJU1 and SJU2 cameras. Where X( t) is the position, V b is the constant velocity, a 1 and a 2 are parameters (Gural, 2012).Ģ.1 Observations from Rio de Janeiro stateįigure 1 – The long path trajectory registered by station SJU2, the image has been converted to CAMS standards. ![]() The astrometry data were reduced by CAMS software, the trajectory and orbit were evaluated using the orbit tool (Jenniskens et al., 2016), applying high quality processing and exponential velocity parameters which are considered more suitable for deceleration values, during the objects transit through the atmosphere, as modeled by the following equation: The calculations to obtain key parameters concerning velocity, atmospheric trajectory and orbital elements of the meteoroid were possible thanks to 3 Exoss station detections, using analog videos, two cameras with a 1/3” and one with a 1/2” sensor, respectively, black and white system mode, suited for meteor video monitoring. Its peculiar material strength as no notable flare was detected, and its orbital elements show a reasonable possibility to be from a NEO parental origin, as Aten’s or even from Atira’s type orbit family. The event is analyzed in this paper, the trajectory and orbit are calculated in addition to mass and size estimate. No space junk reentry over the area had been forecasted ( ). However, further analysis demonstrated that it was a very peculiar meteor, its trajectory duration was about 13 seconds, with a 174 km long path in the atmosphere, the low height and its path indicated it was a meteor. In 2020, May 28 th at 02 h03 m27.5 s UTC Exoss stations SJU1, SJU2 and ROC1 located in the Northern part of Rio de Janeiro state registered a bright and very slow meteor, that initially was thought to be an Earth grazing meteoroid or even a piece of space junk. The Exoss project has as a main goal to survey and to monitor regularly the night sky for the registration of meteors and bolides (De Cicco et al., 2018), producing data for scientific studies. Despite no close encounters to Mercury, Venus and the Earth-Moon barycenter were found after orbital integration for 10 years backwards in time, we suggest, besides planetary gravitational influences, that the Yarkovsky effect dynamically acting upon the meteoroid could have contributed to transform an originally Atira’s type orbit into an Aten’s type orbit, supposing a meteoroid with an initial estimated mass of 0.2 – 0.3 kilograms. After further analysis we concluded that the meteor orbit was similar to a NEO Aten’s class with a perihelion distance q = 0.579 A.U. Its average low height track totally disagreed with an Earth grazing type and even a space junk reentry was disregarded. De CiccoĪbstract: During the night of 2020 May 28, precisely beginning at 02 h03 m27 s UTC, Exoss project cameras registered the path of a very slow meteor, the object entered the atmosphere at an initial velocity of 15.06 km/sec, brightening at 84 km height and disappearing approximately at 49 km height. Barreto, Lucia Horta, Warley Souza, Guilherme M. ![]()
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