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All Journal Jurnal Matematika & Sains Journal of Mathematical and Fundamental Sciences Al-MARSHAD: Jurnal Astronomi Islam dan Ilmu-Ilmu Berkaitan Spektra: Jurnal Fisika dan Aplikasinya Indonesian Journal of Physics (IJP)
Putra Mahasena
1Bosscha Observatory, Lembang 40391 And Astronomy Research Division, FMIPA
Aerospace Engineering Astronomy Chemistry Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mathematics Physics

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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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Abstract

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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Abstract

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. 
Developing Information System on Lunar Crescent Observations T. Hidayat; P. Mahasena; B. Dermawan; D. Herdiwijaya; H. Setyanto; M. Irfan; B. Suhardiman; A. Santoso
Journal of Mathematical and Fundamental Sciences Vol. 42 No. 1 (2010)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2010.42.1.6

Abstract

We present a progress report on the development of information system of lunar crescent astronomical observations which will be largely accessible for public domain. This consists of calculations of the Moon's ephemeris as well as systematic real-time lunar crescent observations. A well suited small telescope, equipped with a simple digital detector, is connected to a server to provide information on lunar crescent observations. The system has been used and worked well. The only constraint is poor weather condition. Network of small telescopes, installed at various locations in Indonesia, are currently planned to provide plethora of data. In the long term, this will be used to help to determine the astronomical visibility criteria of lunar crescent for Islamic calendar.
CCD Photometry of Comet 73P/Schwassmann-Wachmann 3 during Its 2006 Apparition Observed from the Bosscha Observatory Budi Dermawan; P. Mahasena; Taufiq Hidayat; D. Mandey; Muhamad Irfan
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 (209.749 KB) | DOI: 10.5614/itb.ijp.2011.22.4.4

Abstract

On 9-10 May 2006 UT comet 73P/Schwassmann-Wachmann 3 (73P/SW3) passed 0.093 AU from the Earth, being slightly farther away than its discovery on 1930. Interestingly, it has been reported since 1995 that the comet has been breaking up to many components during its trajectory orbiting the Sun with a period of 5.4 years. Here we report our CCD photometric observations of major components B and C during its 2006 apparition. Successful observations were done on 12-14 May 2006 UT at the Bosscha Observatory, Lembang. Since comet is a moving object, we carried out stacking techniques to combine our images in order to strengthen the signal-to-noise ratio. Our investigations to their surface brightness show that the coma of 73P/SW3 was not in a steady state. Under assumption of a steady state coma, the dust production rate of the component is found to be 24.7 cm and the mass-loss rate of 4.94 kg s-1
Measuring and Modelling Crescent Image Contrast with a DSLR Camera M. Hasan Faadillah; Mahasena Putra
Al-Marshad: Jurnal Astronomi Islam dan Ilmu-Ilmu Berkaitan Vol 9, No 1 (2023): Al-Marshad
Publisher : University of Muhammadiyah Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/jam.v9i1.13562

Abstract

The Hijri calendar is synonymous with hilal (young crescent moon) observation. Nowadays, hilal observation is expanding to various circles using instruments that are easily obtained and widely available on the market. The configuration that is often chosen uses a portable telescope and DSLR camera to produce images. Several theoretical models on the visibility of celestial objects at twilight, including the crescent moon, have been developed by several researchers. This has prompted the study of crescent image contrast and testing of more and more data. This study contains alternative processing of crescent moon images from DSLR cameras to measure the contrast value of observations ( 16Cobs" ) and approximated by theoretical models. ( 16Cmod" ).The final result of this research is a model of the hilal contrast limit at a certain elongation and can be applied for those who are interested in testing the contrast limit according to the specifications of the instrument and observation procedures used.
Magnitude Transformation from RGB Bayer Filter to the Johnson-Cousins BVR Filter Based on CAT-ITB Telescope Photometric Observations of Selected Open Clusters Raihan Amirul Husana; Mahasena Putra; Anton Timur Jaelani; Chatief Kunjaya; Aliyya Nur Rahma; Firdaus Orvin Dwifauja Manalu
Spektra: Jurnal Fisika dan Aplikasinya Vol. 11 No. 2 (2026): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 11 Issue 2, August 2026
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.112.05

Abstract

Photometry is one of the astronomical measurement methods that provides astronomers with information about the brightness of astronomical objects at various wavelengths. Over time, various photometric systems have been developed. Therefore, transformations are necessary to convert results from one photometric system to another, with the aim of facilitating scientific communication among researchers working with various photometric systems. The CAT-ITB, or City Astronomical Telescope ITB, is an 11-inch optical telescope located at CAS ITB, equipped with detectors, one of which is the ZWO ASI 183MC that uses the RGB Bayer filter. Hence, transformation equations from the RGB Bayer filter system to the Johnson-Cousins BVR filter system must be established. By utilizing transformation equations that have historically been widely used by previous researchers, this study focuses on deriving the coefficients needed to solve those equations. Observational data of open clusters M67, RU 135, IC 4665, and M11 were obtained using CAT-ITB, which were used to optimize the transformation equations. The coefficients derived from M67 photometric data yielded the best results. The total RMS values for the magnitude transformations of clusters M67, RU 135, IC 4665, and M11 in each of the BJohnson, VJohnson, and RCousins conversions are 0.296, 0.152, and 0.161 respectively. All transformations produced small residuals and colour-magnitude diagrams that closely resemble those from catalog data. This study contributes a validated set of transformation coefficients and zero-point constants specific to the CAT-ITB RGB Bayer detector system, offering a practical reference for converting RGB-based photometric observations into the standard Johnson-Cousins system for future small-telescope and citizen-science photometric research.
Co-Authors A. Santoso Aliyya Nur Rahma Anton Timur Jaelani B. Dermawan B. Suhardiman Budi Dermawan Chatief Kunjaya D. Herdiwijaya D. Mandey Firdaus Orvin Dwifauja Manalu H. Setyanto M. Hasan Faadillah M. Irfan Muhamad Irfan Muhammad Irfan Raihan Amirul Husana T. Hidayat Taufiq Hidayat