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All Journal Jurnal Matematika & Sains Jurnal Spektra Spektra: Jurnal Fisika dan Aplikasinya Jurnal Ilmu Fisika Jurnal Sains Dirgantara Bulletin of Computer Science Research Computer Science (CO-SCIENCE) Aptekmas : Jurnal Pengabdian Kepada Masyarakat Edu Society: Jurnal Pendidikan, Ilmu Sosial dan Pengabdian Kepada Masyarakat Barakuda 45 Indonesian Journal of Physics (IJP) International Journal of Trends in Accounting Research Solusi Bersama : Jurnal Pengabdian Dan Kesejahteraan Masyarakat
Budi Dermawan
Astronomy Research Division, Institut Teknologi Bandung
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Search for New Astronomical Site in Indonesia: II. Transparency of Tropical Atmosphere Taufiq Hidayat; Putra Mahasena; Budi Dermawan
Jurnal Matematika & Sains Vol 15, No 1 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

We present a theoretical model of atmospheric transparencies for tropical region of Indonesia in the framework of developing multi-wavelength astronomical observations. The wavelengths of interest are radio, infrared, and optical domains. Beside science objectives, sky transparencies are needed to determine the corresponding wavelength band to be optimized in the observatory design. A clear sky condition is then assumed in the model and a line-by-line radiative transfer code is used at high spectral resolution.  The results, combined with study on meteorological satellite data, are utilized to provide various information to select the best possible sites for a new astronomical observatory in Indonesia. 
Search for New Astronomical Site in Indonesia : I. Global Atmospheric Parameters Taufiq Hidayat; Putra Mahasena; Budi Dermawan
Jurnal Matematika & Sains Vol 15, No 1 (2010)
Publisher : Institut Teknologi Bandung

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We present initial studies to search for the best possible sites for an astronomical observatory in Indonesia. Since the country occupies a vast geographical area, in so doing, we analyzed a number of basic atmospheric parameters based on GMS-NOAA meteorological satellite data at a low spatial resolution to identify some interesting feasible locations. The selected parameters are outgoing long wave radiation, temperature, precipitation, relative humidity, precipitable water, and wind profile, mostly available for a period of several decades. The data are averaged over 30 years to obtain a monthly average profile of Indonesian meteorological situation. The results suggest that regions of Nusa Tenggara Timur could offer promising sites and is merit to be explored further. 
Search for New Astronomical Site in Indonesia: III. Astronomical Seeing Condition in West Timor Budi Dermawan; Putra Mahasena; Taufiq Hidayat; Muhammad Irfan
Jurnal Matematika & Sains Vol 15, No 1 (2010)
Publisher : Institut Teknologi Bandung

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Global meteorological study over Indonesia has identified that Nusa Tenggara Timur is a good candidate for an astronomical site. West Timor, in the eastern region of Nusa Tenggara Timur, is subsequently selected to be surveyed both for topographical and sky quality. The latter is studied theoretically in term of transmittance of tropical atmosphere. This work presents in situ measurement undertaken for Kupang (longitude: 123° 34¢ 4² E, latitude: 10° 10¢ 19² S) to derive the seeing values. The same procedure was also performed for Lembang, West Java (longitude: 107° 36¢ 58² E, latitude: 6° 49¢ 33² S) in order to quantitatively compare the proposing site to the established one. Our result shows that Kupang has about 50% better seeing condition than that of Lembang. 
Probability of Finding Terrestrial Planet Within Habitable Zone of Extrasolar Planetary System Ratna Satyaningsih; Taufiq Hidayat; Avivah Yamani; Budi Dermawan
Jurnal Matematika & Sains Vol 15, No 2 (2010)
Publisher : Institut Teknologi Bandung

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Habitable zone in a planetary system is defined as the region around a star where life-supporting planets can exist. Typically it requires the presence of liquid water on the planetary surface. Considering the formation of planetary systems, we investigate how stellar mass affects the probability of terrestrial planets formed within habitable zone. We use our Planetary System Generator code (Yamani, 2007) to generate planetary systems by investigating its sensitivity through several parameters, such as stellar mass, stellar luminosity, and effective temperature. The probability of finding terrestrial planets within the habitable zone of extrasolar planetary system has been then calculated. We selected the exoplanet systems: Gl 581, HD 128311, 55 Cnc, 47 UMa, and Ups And-like to evaluate the presence of planets within their habitable zone. 
A Monte Carlo Modeling of Planetary Formation: A Case of 47 Ursae Majoris System Avivah Yamani; Taufiq Hidayat; Ratna Satyaningsih; Budi Dermawan
Jurnal Matematika & Sains Vol 15, No 2 (2010)
Publisher : Institut Teknologi Bandung

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This paper presents a Monte Carlo simulation, using Planetary System Generator, which has been built based on a simple accretion model by Dole (1970) and by considering the present structure of the Solar System. Data of known extrasolar planets have also been taken into account.   It was then applied to generate 47 Ursae Majoris (47UMa)-like planetary systems. The results are subsequently compared to the observed data of 47UMa. The dynamical evolution as well as the stability of the system have been evaluated by using a n-body formalism accounted for in our simulation. The generated system reproduced approximately the observational data and suggests that some other accompanying planets may exist. The orbital evolution is also found to be stable within the current age of the system.
DINAMIKA ORBIT ASTEROID 2012 DA14 PASCAPAPASAN DEKAT DENGAN BUMI Utama, Judhistira Aria; Dermawan, Budi
Jurnal Spektra Vol 16, No 1 (2015): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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AbstrakTidak berselang lama pascapenemuannya (23 Februari 2012) oleh Observatorio Astronómico de La Sagra, Spanyol, asteroid 2012 DA14 (367943 Duende) mengalami papasan dekat dengan Bumi pada 16 Februari 2013 silam di jarak kurang dari jarak satelit geostasioner. Pascapapasan dekatnya tersebut asteroid ini dikelompokkan ke dalam kelas Aten, yaitu kelompok asteroid dekat-Bumi (ADB) yang memiliki orbit memotong orbit planet Bumi dengan setengah sumbu panjang orbit kurang dari 1 satuan astronomi. Menggunakan paket integrator Mercury, dalam pekerjaan ini dihitung evolusi orbital asteroid pascapapasan dekatnya hingga 1000 tahun ke depan. Selama selang waktu integrasi yang dilakukan, didapati bahwa asteriod ini beberapa kali mengalami papasan dekat dengan planet Bumi, Venus, dan Bulan. Dalam kurun waktu tersebut, asteroid dan keenampuluh asteroid virtualnya tidak ada yang menjadi benda penumbuk untuk planet Bumi dan Venus maupun Bulan.AbstractLess than one year after its discovery on February 23, 2012 by the Observatorio Astronómico de La Sagra, Spain, asteroid 2012 DA14 (also known as 367943 Duende) passed above Earth’s surface closer than geosynchronous satellites on February 16, 2013. According to Minor Planet Center (MPC) the asteroid is catagorized as Aten class for now, group of Earth-crossing asteroids with semimajor axis smaller than 1 astronomical unit. We employ Mercury package, a software for doing N-body integrations, to calculate the orbital evolution of 2012 DA14 for 1,000 years of orbital integrations after its last close approach with Earth. According to variation of nominal and virtual asteroids’s orbital elements during the integration time, the objects will experience several times of close approach with Earth, Venus and Moon but will not to be an impactor for these Terrestrial planets and natural satellite.Keywords: near-Earth asteroids, orbital evolution, Mercury integrator.
PERHITUNGAN ELEMEN ORBIT BINTANG GANDA WDS 03264+3520 MENGGUNAKAN METODE SEMI-DEFINITE PROGRAMMING Achmad Zainur Rozzykin; Ayu Dyah Pangestu; Budi Dermawan
Jurnal Sains Dirgantara Vol 18, No 1 (2020)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jsd.2020.v18.a3470

Abstract

Banyak metode yang digunakan untuk menentukan elemen orbit elips bintang ganda. Salah satu metode yang relatif baru digunakan dalam penentuan elemen orbit adalah Semi-Definite Programming (SDP). Metode ini digunakan untuk menyelesaikan persamaan umum elips dari data pengamatan dengan batasan tertentu, yang memberikan solusi tunggal melalui konsep optimisasi konveks. Salah satu keunggulan metode SDP adalah mampu mendapatkan elips terbaik dari jumlah titik data yang terbatas dengan persebaran yang sempit (mengelompok). Tujuan penelitian ini adalah menentukan elemen orbit bintang ganda WDS 03264+3520 atau HDS 430 dengan terlebih dahulu mendapatkan koefisien persamaan elips orbit proyeksinya melalui SDP. Kemudian dengan menggunakan metode Kowalsky, didapatkan nilai elemen orbit elips sejati dari bintang ganda ini. Implementasi skema paralaks dinamika menghasilkan massa masing-masing bintang melalui proses iteratif dengan melibatkan nilai magnitudo mutlak bolometrik bintang. Hasil perhitungan elemen orbit dan massa bintang ganda ini menunjukkan bentuk orbit yang lebih lonjong (eksentrik) dengan massa bintang yang sedikit lebih rendah daripada hasil studi sebelumnya.
TUMBUKAN TAK-ELASTIK PARTIKEL SEBAGAI MODEL TERBENTUKNYA ASTEROID Sparisoma Viridi; Budi Dermawan
Spektra: Jurnal Fisika dan Aplikasinya Vol 2 No 1 (2017): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 2 Nomor 1, April 2017
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (345.261 KB) | DOI: 10.21009/SPEKTRA.021.08

Abstract

Abstrak Suatu asteroid diduga merupakan kumpulan partikel yang bertumbukan tak-elastik sehingga membentuk suatu agregat. Ikatan yang terjadi antar partikel diasumsikan hanyalah disebabkan gaya gravitasi. Gaya normal diperkenalkan untuk mencegah dua partikel berada pada posisi yang sama akibat gaya gravitasi. Parameter kontaktopi diperkenalkan dan teramati bahwa nilainya bertambah dengan semakin padatnya susunan agregat dan pada akhirnya akan mencapai nilai saturasi. Dalam sistem yang disimulasikan dengan jumlah partikel N = 22 diperoleh bahwa kontaktopi mencapai nilai saturasi pada C = 35. Kata-kata kunci: partikel granular, dinamika molekuler, asteroid, kompaksi. Abstract An asteroid is assumed to be constucted from particles inealastic collision, which later forms an agregate of particles. Binding between particles is caused only by gravitational force. Normal force is introduced to prevent two particles collapsing into single point as they are colliding and attracted to to each other due to gravitational force. Contactotpy as parameter is presented and it is observed that its value increasing as the agregate becoming denser, and at the end it achieves saturation value. In the simulated system with number of particles N = 22 it is obtained that the contactopy reaches saturation value C = 35. Keywords: granular particles, molecular dynamics, asteroid, compaction
DISTRIBUSI SPASIAL DENSITAS CAKRAM BERUKURAN SAMA DALAM PEMODELAN PEMBENTUKAN ASTEROID Sparisoma Viridi; Budi Dermawan
Spektra: Jurnal Fisika dan Aplikasinya Vol 2 No 2 (2017): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 2 Nomor 2, Agustus 2017
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (413.497 KB) | DOI: 10.21009/SPEKTRA.022.07

Abstract

Several two-dimension particles in the form of a disk, which only interact through gravitational force and normal force, are simulated. Assumed that there are only two values of particle density (same diameter but different mass). Simulation are conducted until particles position are slightly constant. It is obtained that density is varied radially, decreasing with an increase of radial position, and nearly isotropic angularly in final condition. It has been simulated N = 64 particles with mass ratio mA/mB = 0.25 for 944 s simulation time. Keywords: asteroid forming, granular material, density distribution, binary mixture
Dynamical Evolution of Sub-km Sized Main-belt Asteroids with Involving Thermal Radiation Effects Budi Dermawan; A. Fermita
Indonesian Journal of Physics Vol 22 No 4 (2011): Vol. 22 No. 4, October 2011
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (900.053 KB) | DOI: 10.5614/itb.ijp.2011.22.4.3

Abstract

Inconsistencies between asteroid’s evolutionary model and observational results have been convincingly explained by thermal radiation effects that cause asteroids to experience orbital drifts. To investigate influences of the effects, we conducted 10 million yr orbital integration of hypothetical sub-km sized Main-belt asteroids. Numerical integration was run to propagate orbital dynamics of the asteroids by taking into account typical physical parameters of regolith- and basaltic-type surfaces of asteroids. Delivery processes from the Main-belt asteroids to near-Earth space are occurred by the aids of planetary orbital resonances and gravitational perturbations. In general, we find that thermal radiation effects play as an important role in the early evolution (< 1 million yr), which guide the asteroids to follow different evolutionary paths than those of without involving the effects. This study indicates that asteroids whose surface belongs to basaltic-type have higher orbital mobility.
Co-Authors A. Fermita Abdul Kadir Achmad Zainur Rozzykin Alvina Zahra Ananda Nur Hidayat Arif, Siti Asiah, Antung Noor Avivah Yamani Ayu Dyah Pangestu Boedi, Soelistijono D. Mandey Daulay, Umiati Fauzi, Umar Firdaus, Iqbal Harfiani, Rizka Henny Septiana Amalia Iskandar, Andri Judhistira Aria Utama La Fatsa Fauzia Masruriyah, Anis Muhamad Irfan Muhammad Irfan Muhammad Maladi Munawaroh, RR Siti Nastiti, Rizky Nida Fadhila Novita, Hilda Paniran Putra Mahasena Ramadhan, Angga Ramadhan, Rahma Zulfa Ratna Satyaningsih Saifhul Anuar Syahdan Selpiyani Br Simanjorang Sjamsudin, Adella Vanessa Sparisoma Viridi Sukmawati, Cici Syamsuyurnita, Syamsuyurnita Taufiq Hidayat Taufiq Hidayat