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All Journal Jurnal Fisika FLUX Indonesian Journal of Aerospace
Wibowo, Ridlo Wahyudi
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Aerospace Engineering Astronomy Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics

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Photometric Observations of Short Period Variable Stars: EH Librae Djumari, Sulthan Julieri; Malasan, Hakim Luthfi; Wibowo, Ridlo Wahyudi; Wahidin, Alka Budi
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 21, No 1 (2024): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v21i1.17865

Abstract

EH Librae [BD-00 2911; αJ2000 = 14h58m55.92s; δJ2000 = -0°56'53.01'] is a pulsating variable δ Scuti stars which is located in the constellation of Libra and has a period of 0.0884129 days. The aim of this research is to obtain and analyze the light curve, deduce the period, and derive the physical parameters of EH Librae. Observations were made using the ITERA Robotic Telescope 0.25m Ritchey-Cretian with CCD ATIK 383L+ on the BVR band. Aperture photometry was performed to measure the flux of EH Librae. Light curve was constructed using the differential photometry method, and the determination of the period was carried out using the Lomb – Scargle method. Secondary data from the Transiting Exoplanet Survey Satellite (TESS) is used as an addition to derive the physical parameters of EH Librae. The results of this study are the light curve of EH Librae on the BVR band with Magnitude, V = 9.506 – 10.071 ± 0.002. Using the index color  = 0.271, we derived the   = (7.7 ± 0.4) 103 K. O – C diagram shows no significant changes in the period. Derivation of physical parameters are  = 2.12 ;  = 1.4 ; and  = 3.93 cgs was carried out using asteroseismology method with  = 846  and  = 51.9 
Characterization of Do-It-Yourself (DIY) Ultra Compact ITERA Robotic Telescope (UTOPIA-Scope) Mounting Barends, Renza Alvionzo; Prastyo, Hendra Agus; Rozzykin, Achmad Zainur; Wahidin, Alka Budi; Wibowo, Ridlo Wahyudi; Yusuf, Aditya Abdilah; Oktaviandra, Adhitya
Indonesian Journal of Aerospace Vol. 23 No. 2 (2025): Indonesian Journal Of Aerospace
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/ijoa.2025.4098

Abstract

Low-cost and locally fabricated robotic telescope systems are increasingly important for education, amateur astronomy, and basic scientific observation. This paper presents the characterization of the UTOPIA-Scope, a do-it-yourself (DIY) alt-azimuth robotic telescope mount developed using extruded aluminum structures and 3D-printed strain-wave gears. The performance of the mount was evaluated through pointing and tracking tests using an alt-azimuth grid and selected equatorial stars. Image center coordinates were obtained using plate-solving techniques and analyzed with descriptive statistical methods. The results show average pointing errors of 1.600° ± 0.123° in azimuth, 0.415° ± 0.048° in altitude, and 0.451° ± 0.106° in equatorial pointing, corresponding to approximately 96′, 25′, and 27′, respectively. Tracking tests indicate drift rates of 22–36 arcsec per minute, depending on the observed sky region. These results provide a quantitative baseline for the performance of the UTOPIA-Scope mount and serve as a reference for further mechanical and control-system improvements toward future scientific applications.
Co-Authors Barends, Renza Alvionzo Djumari, Sulthan Julieri Malasan, Hakim Luthfi Oktaviandra, Adhitya Prastyo, Hendra Agus Rozzykin, Achmad Zainur Wahidin, Alka Budi Yusuf, Aditya Abdilah