DIY Photometer Performance Test in Determining Morning Twilight
Cahyo Puji Asmoro (a,b*), Judhitira Aria Utama(b), Hana Susanti (b), Dhani Herdiwijaya (a), Mahasena Putra (a)

a) Astronomy Postgraduate Program, Institut Teknologi Bandung, Indonesia, *20322005[at]mahasiswa.itb.ac.id
b) Physics Study Program, Universitas Pendidikan Indonesia

Abstract

DIY Sky Quality Meter (SQM) with the name Photometer D.I.Y - CJ^01 has been successfully made, the use of SQM as a photometer is currently a hot topic for astronomical research in terms of measuring sky brightness. The data obtained by the photometer is the value of magnitude per square arc second (mag/sq arc second ~ msas) with a maximum value of 21.7 msas as a quantization of the representation of a very dark sky with the presence of natural airglow then gradually decreases to 16.7 msas when the sky is brighter due to the presence of artificial airglow from lighting like in big cities. This research aims to determine the performance of the name Photometer D.I.Y - CJ^01in measuring the brightness of the sky to determine the morning twilight. The research method used was an experiment with data collection from Photometer D.I.Y - CJ^01 and SQM Unihedron in Cimahi City. Data processing shows that the Photometer D.I.Y - CJ^01 has almost the same performance as the SQM Unihedron where the determination of dawn gives a difference in the value of the sun^s depression angle of -0.09452 degree.

Keywords: Photometer, Morning Twilight, DIY

Topic: Earth and Planetary Sciences