Exploring the Effects of Impacts onto Phaethon and Other Near Earth Asteroids

探索撞击对法厄同和其他近地小行星的影响

• 批准号: 2009775
• 负责人: William Bottke
• 金额: $ 37.36万
• 依托单位: Southwest Research Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2009775&HistoricalAwards=false
• 关键词: Exploring; Effects; Impacts; onto; Phaethon

The Geminid Meteor Shower is rare in that its parent body, 3200 Phaethon, is an asteroid, not a comet. Most meteor showers are generated by particles expelled from comets by solar heating and evaporation. In Phaethon’s case, the mechanism is less obvious. The team previously explained mass loss at 101955 Bennu as arising due to micrometeoroid impacts from comet particles. The team will now model this idea for Phaethon using NASA’s Meteoriod Engineering Model (MEM). Their hypothesis is that the Geminids are formed through micrometeorite impacts, causing Phaethon to leave a trail of particles, much like a comet. The team will also model mass loss and evolution for weakly-bound primitive bodies that pass close to the Sun. The team will also participate in SwRI’s Summer Science Program (SSP) and conduct a two-day computational session for high-school students in the program.The team will use NASA’s Meteoroid Engineering Model to model micrometeoroid impact on a weak primitive surface as is thought to represent 3200 Phaethon in a region at 0.14 AU from the Sun. In prior work with MEM, the team found mm-sized meteoroids strike Bennu frequently enough at 40 km/s to explain all particle ejection event constraints. Using the Bennu study to guide their work, the team will (i) use the MEM model to determine the mass/direction of ejected debris from Phaethon per perihelion passage, (ii) use dynamical models to determine whether Phaethon debris can reproduce the Geminids over the last ~1000 years, and (iii) use dynamical models to explore Phaethon’s origin, which they argue is probably not from the Pallas asteroid family.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

双子座流星雨的罕见之处在于，它的母体3200法埃东是一颗小行星，而不是彗星。大多数流星雨是由彗星通过太阳加热和蒸发排出的颗粒产生的。在法伊顿的案例中，这种机制不那么明显。该团队此前解释说，101955本努的质量损失是由于彗星粒子对微流星体的撞击造成的。该团队现在将使用NASA的流星工程模型(MEM)为法埃顿建立这个想法的模型。他们的假设是，双子座是由微陨石撞击形成的，这导致法埃东留下了一条粒子的轨迹，就像彗星一样。该团队还将对靠近太阳的弱束缚原始体的质量损失和演化进行建模。该团队还将参加SWRI的夏季科学计划(SSP)，并在该计划中为高中生进行为期两天的计算。该团队将使用NASA的流星体工程模型来模拟微流星体对脆弱原始表面的影响，该模型被认为代表距离太阳0.14 AU的区域中的3200个法埃顿。在之前与MEM的合作中，该团队发现毫米大小的流星体以40公里/S的速度撞击本努的频率足以解释所有粒子抛射事件的限制。利用本努的研究来指导他们的工作，该团队将(I)使用MEM模型来确定每个近日点通道中菲埃顿抛出的碎片的质量/方向，(Ii)使用动力学模型来确定菲厄冬碎片是否能够在过去1000年中复制双子座，以及(Iii)使用动力学模型来探索菲厄东的起源，他们认为这可能不是帕拉斯小行星家族的。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Low surface strength of the asteroid Bennu inferred from impact ejecta deposit

• DOI: 10.1038/s41561-022-00937-y
• 发表时间: 2022-05-23
• 期刊: NATURE GEOSCIENCE
• 影响因子: 18.3
• 作者: Perry, M. E.;Barnouin, O. S.;Lauretta, D. S.
• 通讯作者: Lauretta, D. S.

NEOMOD: A New Orbital Distribution Model for Near-Earth Objects

NEOMOD：近地天体的新轨道分布模型

• DOI: 10.3847/1538-3881/ace040
• 发表时间: 2023
• 期刊: The Astronomical Journal
• 作者: Nesvorný, David;Deienno, Rogerio;Bottke, William F.;Jedicke, Robert;Naidu, Shantanu;Chesley, Steven R.;Chodas, Paul W.;Granvik, Mikael;Vokrouhlický, David;Brož, Miroslav
• 通讯作者: Brož, Miroslav