![]() ![]() We can see that "fa" is proportional to the gas production rate. This is because during an outburst, the regular outgasing process is negligible compared to the physical processes really going on. Now during a comet outburst, a simplistic computation of "fa" might lead to fa>1. around 0.1 (meaning that 10% of the surface is active). This parameter is usually computed from the comet dust production rate and is lower than 1.0 (1.0 means that 100% of the surface of the nucleus is outgasing). Now the crucial question is: how realistic is a 2.5 ejection velocity factor? Crifo & Rodionov (1997) model involves the "fa" factor: fraction of active area. Small and large circles are the Earth and Jupiter orbits. Location of the τ-Herculids meteoroid stream for a 2.0 (left) and 2.5 (right) velocity mutiplication factor: only the 2.5 factor bring the meteoroids at the Earth in May 2022. This is illustrated in the figure below, where a comparison between a factor of 2.0 and 2.5 is drawn. What matters here are the meteoroids located in front of the nucleus. The reason is quite simple: a higher ejection velocity brings the meteoroid further from the nucleus. Taking our good old model of meteoroid ejection and evolution in the Solar System, we find that the ejection velocity must be at least 2.5 time higher than the one computed with a regular Crifo & Rodionov (1997) model to make it to the Earth in 2022. How to bring the meteoroids ejected by comet 73P to the Earth in 2022? In this (short) study, we confirm Joe Rao's finding and go slightly further, exploring the conditions that makes the shower possible, as well as the observation optimization. Rao also explored the influence of the change of the comet orbital elements. In 2021, Joe Rao published a study showing that if the meteoroids are ejected at higher velocity, they will definitely cause a TAH ourburst. ![]() However, our study considered classical meteoroid ejection from the comet, and neglected the effect of the 1995 outburst. Our conclusion was negative, but some older material (ejected during the 19th c.) will definitely cause a shower enhancement in 2022. The comet is famous for having an important ourbuts in 1995, resulting in several fragments, particularly well observed during the 2006 perihelion return.īack in 2005, we asked the question whether or not the meteoroids ejected during this event would cause a τ-Herculids (hereafter TAH) ourburst. The τ-Herculids meteor shower (IAU #61) is known to be caused by comet 73P/Schwassmann-Wachmann 3. Detection of a τ-Herculids meteor clusterģ1st of May 2022 τ-Herculids Introduction.Airborne observation of the 2022 τ-Herculids.Optimization of the 2022 τ-Herculids observations.Expected number of meteors visible by nake eye.2022 τ-Herculids meteor shower outburst circumstances.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |