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All Journal Astroislamica: Journal of Islamic Astronomy
Ruslandi, Ruslandi
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Religion Astronomy

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Perbandingan Medan Pandang Teleskop dalam Pengamatan Konjungsi Bulan – Jupiter dari Kota Medan, Barus, dan Lhokseumawe Putraga, Hariyadi; Firdaus, Muhammad Dimas; Ritonga, Marataon; Rakhmadi, Arwin Juli; Ruslandi, Ruslandi; Ismail, Ismail
Astroislamica: Journal of Islamic Astronomy Vol. 3 No. 1 (2024): Astroislamica: Journal of Islamic Astronomy (Juni)
Publisher : Islamic Astronomy Department, Sharia and Law Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47766/astroislamica.v3i1.2816

Abstract

Astronomical phenomenon occur for only a limited amount of time. Observing these phenomenon requires competent promoters and appropriate instruments. The field of view is one of the things that needs to be clearly known so that the observation can take place properly. In this study, joint observations were made between IAIN Lhokseumawe Falak Science Study Programme and OIF UMSU in Medan and Barus. The instruments used in these observations are different, resulting in a variety of fields of view and calculations are needed to get a description of the results. This study aims to calculate the field of view and visibility of the observed phenomenon, the conjunction of the Moon - Jupiter. The results obtained are for the instrument used by IAIN Lhokseumawe Falak Science Study Program at Malikussaleh Observatory has a field of view of 2°7'46.13‘ × 1°25'22.25’, the instrument used by UMSU Medan Falak Science Observatory has a field of view of 1°8'26.96‘ × 0°54'45.57’, and the instrument used by the OIF UMSU Barus team has a field of view of 1°0'43.74’ × 0°41'1.98. Using this combination of instruments cannot observe the conjunction phenomenon, because the elongation of the Moon - Jupiter at the time of the observation is >4°, so to be able to get the visibility of the phenomenon in 1 image requires an instrument that produces a field of view of ~5°.
Analisis Tingkat Kecerahan Langit Malam Terhadap Visibilitas Hilal Menggunakan Sky Quality Meter di Observatorium Malikussaleh IAIN Lhokseumawe Kharida Alhan, Devina; Ruslandi, Ruslandi; Ismail, Ismail
Astroislamica: Journal of Islamic Astronomy Vol. 4 No. 1 (2025): Astroislamica: Journal of Islamic Astronomy (Juni)
Publisher : Islamic Astronomy Department, Sharia and Law Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47766/astroislamica.v4i1.3374

Abstract

In the dark of the night, the sky offers wonders like the crescent moon (hilal), which marks the beginning of the Islamic month. The hilal is often observed at the Malikussaleh Observatory, IAIN Lhokseumawe. This study uses a Sky Quality Meter (SQM) to measure the night sky brightness and how it affects hilal visibility. This field research employs a qualitative approach with a descriptive method. Primary data is obtained from direct observations using the SQM before and after sunset, while secondary data comes from relevant literature. The study finds that the night sky brightness at the observatory is Class 5 on the Bortle Scale, with an average of 19.80 MPSAS, categorized as Suburban Sky. The average brightness during hilal observation is -3.03397 v mag, while the hilal magnitude is -7.36 v mag. Therefore, the hilal can be observed if its magnitude is lower than the night sky brightness.
Co-Authors Arwin Juli Rakhmadi Firdaus, Muhammad Dimas Hariyadi Putraga Ismail Ismail Ismail Ismail Kharida Alhan, Devina Ritonga, Marataon