THE ORBITAL CHARACTERICTICS OF ASTEROID 469219 KAMO'OALEWA (2016 HO3) AS EARTH'S QUASI-SATELLITE

• Main Author: Rezky, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/39090
• Institution: Institut Teknologi Bandung

The study of the orbital dynamics and evolution of asteroids is steadily growing, especially in context of a new near-Earth asteroid discovery. Among various topics in the study, quasi-satellite (QS) was mentioned on every asteroids with orbital characters similar to its closest celestial body like a planet or a natural satellite. Nowadays, astronomers have managed to find QS asteroids co-orbits several planets in the Solar System, including Earth. There are 5 confirmed Earth’s QS asteroids: (164207) 2004 GU9, (277810) 2006 FV35, 2013 LX28, 2014 OL339, and 469219 Kamo'oalewa (2016 HO3). Among these five celestial bodies, de la Fuente Marcos & de la Fuente Marcos (2016a) states that asteroid 469219 Kamo’oalewa are the smallest and closest Earth QS asteroid, with longer coorbital period than 4 other Earth’s QS asteroids. This Final Project aimed to determine the orbital characteristics of 469219 Kamo'oalewa as an Earth’s QS asteroid and compare it with 4 other Earth’s QS asteroids. The initial orbital data of 5 Earth QS asteroids, 8 planets in the Solar System, and the Moon was obtained from the database "HORIZON System" available on the http://ssd.jpl.nasa.gov/?horizons page. Data from each asteroid was simulated with the planets and the Moon using the Gauss–Radau method in the IAS15 integrator, which available in the REBOUND computational software package. Integration is carried out within the time period of (-1,000,000; 1,000,000) years from the epoch of April 27th, 2019 at 00:00:00 TDB (JD 2458600.5), with the iterations (time-step) for every 1/365.25 year. The result shows that the asteroid 469219 Kamo'oalewa became the Earth’s coorbital satellites during the time period of (-633,700; 126,200) years. Within that range, the QS phase occurs on 465 cycles, with 46% of them having a period of < 27 years. As long as the QS phase takes place, the asteroid 469219 Kamo'oalewa orbital parameters value became much stabilized within shorter period compared to its HS phase. Secular interaction with Jupiter and the Earth’s Moon allowed the asteroid to have its HS-QS transition trend and also Kozai–Lidov resonances which happens only on a longer-period HS phase. Comparation with 4 other QS Earth asteroids concludes that the character of the QS orbit on the asteroid 469219 Kamo'oalewa is unique to the Earth’s coorbital asteroid which experiences the transition of HS-QS.