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All Journal Jurnal Sains Dirgantara Indonesian Journal of Physics (IJP)
Endang Soegiartini
Department Of Astronomy, Faculty Of Mathematics And Natural Sciences, Institut Teknologi Bandung, Jl. Ganesa 10, Bandung - 40112, Indonesia
Astronomy Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering

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TELAAH AWAL KEUBAHAN SETENGAH SUMBU PANJANG AKIBAT EFEK YARKOVSKY PADA ASTEROID 3362 KHUFU (1984 QA) Endang Soegiartini; Suryadi Siregar
Jurnal Sains Dirgantara Vol 5, No 2 (2008)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4728.827 KB)

Abstract

Efek Yarkovsky adalah gaya non-gravitasional yang bekerja pada benda yang disebabkan oleh emisi anisotropik foton termal, yang memberi momentum bagi benda tersebut. Efek ini biasanya terjadi pada meteoroid atau asteroid berukuran kecil (dengan diameter 10 cm sampai 10 km). Tulisan ini mencoba meninjau efek Yarkovsky tersebut bagi asteroid 3362 Khufu (1984 QA) yang berdiameter 0.7 km, serta Bond-albedo 0.17. Efek Yarkovsky menyebabkan keubahan pada setengah sumbu panjang orbit, akibatnya eksentrisitas orbit juga berubah. Terjadinya perubahan pada elemen orbit memberikan peluang asteroid tersebut bergerak mendekati Bumi. Telaah ini menunjukkan amplitudo keubahan setengah sumbu panjang orbit terhadap waktu akibat komponen harian dan musiman, masing-masing maksimal adalah 1.3×10-5 m/detik dan -3.7×10-9 m/detik. Kata kunci: Efek Yarkovsky, Asteroid, Orbit.
Yarkovsky Effect on the Orbital Dynamics of 1566 Icarus Asteroid Niken Rara Galih Amithya Parastuti; Endang Soegiartini
Indonesian Journal of Physics Vol 30 No 1 (2019): Vol 30 No 1 (2019)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (703.16 KB) | DOI: 10.5614/itb.ijp.2019.30.1.2

Abstract

The orbital dynamic of small objects is an n-body problem that can not be solve by analitically, it is needed to use numerical integration to find the solution instead. This work is about orbital dynamic of asteroid 1566 Icarus under Classical Newtonian gravitation and if thermal effect (Yarkovsky effect) is included. Yarkovsky Effect is a thermal radiation force resulted from time span of small rotating objects to receive heat from the Sun and then re-radiates it. The Yarkovsky Effect is working optimum for objects with diameter from 10 cm up to 10 km, and now is implemented to Asteroid 1566 Icarus with diameter 1.3 km which are member of Apollo and Earth crosser object. This Asteroid is called Earth crosser due to its orbit is crossing Earth’s orbit. With semi major axis a  1.078 au and eccentricity e  0.827, asteroid 1566 Icarus has perihelion distance q = 0.18674 au or less than semi major axis of Mercury. Due to that reason, Yarkovsky effect was considered to be applied on the orbital dynamics of asteroid 1566 Icarus. Due to sensitivity in input-data of numerical integration for n-body, one hundred simulation preliminary data were made as input in numerical integration process, therefore, 100 clones of Asteroid 1566 Icarus are gathered. Cloning process was conducted by using random number from Asteroid 1566 Icarus orbital elements at epoch 2456800.5 (23 May 2014) to standard deviation . The integration then later conducted within 105 years time span from the epoch. The result shown that the orbital dynamics of asteroid 1566 Icarus with Yarkovsky effect is still within the range of 100 clones of asteroid 1566 Icarus. Thereby, within 105 years, Yarkovsky effect does not change the orbital dynamic of asteroid 1566 Icarus globally, except for two phenomenon between close encounter with planet.
Co-Authors Niken Rara Galih Amithya Parastuti Suryadi Siregar