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Study of Didymos Binary System

Presentation #404.01 in the session Asteroids: Observational Surveys (Poster + Lightning Talk)

Published onOct 23, 2023
Study of Didymos Binary System

We have studied the asteroid binary system called DIDYMOS for two days before the collision and two days after the impact, in order to detect possible changes in the brightness of the system. On September 26, Mission DART–NASA successfully impacted the asteroid DIMORPHOS which rotates around the asteroid DIDYMOS. Didymos has a diameter of 780 ± 30 meters and Dimorphos has a diameter of 150 ± 30 meters . Didymos spins rapidly – rotating about once every 2.26 hours. The objective of the experiment is to slightly modify the period of rotation of the asteroid Dimorphos around Didymos (whose value is approximately 11.9 hours). From our Observatory, located in Pasto-Colombia, we captured several pictures and videos during four days: two days before the collision and two days after the collision. We made photometry and astrometry measurements of the DIDYMOS system. The astrometric data was published by the Minor Planet Center (MPC), and also appears at the web page of NEODyS.The videos were published by SPACEWEATHER on the following dates: September 23/2022, and at September 26/2022. The images of the asteroid were captured with the following equipment: CGE PRO 1400 CELESTRON (f/11 Schmidt-Cassegrain Telescope) and STL-1001 SBIG camera. We designed the phase curve of the system with the available data. We obtained the following orbital parameters of the system: eccentricity = 0.3839004 ± 0.00429, orbital inclination = 3.40849 ± 0.030 deg, semi-major axis =1.64412388 ± 0.0118 A.U, longitude of the ascending node = 73.09640 ± 0.08 deg, argument of perihelion = 319.43719 ± 0.09 deg, perihelion distance = 1.01294399 ± 0.00022 A.U, aphelion distance = 2.27530378 ± 0.0236 A.U, mean motion = 0.46752222 ± 0.00504 deg/d. Physical parameters: Absolute magnitude = 17.5, sidereal orbital period = 770.00 days. The parameters were calculated based on 23 observations (2022 Sept. 23-28) with mean residual = 0.12 arcseconds.

Conclusions: After the collision there was an increase in the brightness of the system by a factor of 3.4 due to the production of the dust cloud.

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