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New insights into asteroid properties: A STEP…

September 16, 2024
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New insights into asteroid properties: A STEP…
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One of many first recipients of The Planetary Society’s STEP (Science and Expertise Empowered by the Public) Grant program was a mission to raised perceive near-Earth asteroids. This yr, that mission achieved its fundamental targets and scientific aims.  

In 2022, The Planetary Society awarded a $44,842 grant to a workforce from the College of Belgrade, Serbia, led by Professor Bojan Novaković, for his or her proposal “Demystifying Close to-Earth Asteroids.” This mission aimed to develop and apply a brand new technique for figuring out the bodily properties of asteroids with orbits that come near Earth’s orbit (additionally referred to as near-Earth asteroids, or NEAs). Though tens of hundreds of NEAs have been discovered, we solely know the bodily properties of a small proportion — from stable rock asteroids to collections of boulders to fluff balls. 

Over the course of their two-year mission, Novaković’s workforce launched an progressive software named the Asteroid Thermal Inertia Analyzer (ASTERIA) to measure how nicely asteroids retain warmth, giving perception into their composition and construction. 

Not like conventional thermo-physical modeling-based strategies that contain advanced calculations, ASTERIA simplifies the method utilizing a random sampling method to foretell the thermal inertia primarily based on how asteroids drift over time as a result of Yarkovsky impact — a delicate pressure performing on rotating our bodies in area brought on by the emission of thermal photons. ASTERIA is particularly helpful for smaller asteroids, the place conventional fashions battle as a result of they don’t have sufficient information. 

The mission workforce examined ASTERIA on the well-studied asteroid Bennu and 10 different near-Earth asteroids. Their outcomes have been per earlier findings from different strategies, validating the ASTERIA technique whereas additionally proving it as a helpful approach of independently confirming findings from different strategies sooner or later. 

One specific a part of the mission targeted on the asteroid Didymos and its moonlet Dimorphos, which was the goal of NASA’s DART mission. When the DART spacecraft deliberately impacted Dimorphos in September 2022, it proved an asteroid deflection method and in doing so, turned Dimorphos into an “lively asteroid,” ejecting particles which will have settled on each the moonlet and its host asteroid. 





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