1. Angular separation measurement of v Geminorum using lunar occultation technique from Balai Cerap Al-Khawarizmi, Melaka.
- Author
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Norharizan, M. Daim, Aziz, A. Halim A., Razali, N. Nazmi, Razi, M. Fadzli M., Aris, M. Fitriyazid, Jani, M. Adha Md., Tou, Teck-Yong, Yokoyama, Jun'ichi, Shukor, Roslan Abdul, Tanaka, Kazuhiro, Choi, Hyoung Joon, Matsumoto, Ryoji, Chin, Oi-Hoong, Chin, Jia Hou, and Ratnavelu, Kuru
- Subjects
LUNAR occultations ,ANGULAR distance ,ANGULAR measurements ,BINARY stars ,OCCULTATIONS (Astronomy) ,ASTRONOMICAL observatories ,ADAPTIVE optics ,SPECKLE interferometry - Abstract
In 2018, a routine observation of lunar occultation events was conducted from Balai Cerap Al-Khawarizmi Melaka with the collaboration of School of Physics, Universiti Sains Malaysia. The routine observation aimed at measuring the angular separation of binary stars using the lunar occultation technique which is the first in Malaysia. The 16-inches Ritchey-Chretien Optical System telescope of Balai Cerap Al-khawarizmi Observatory with QHY5-III 224C CMOS camera were used for the observations. The observations were made every first half of the lunar month for nine months with two months break. From the observation, 56 disappearance events on the dark limb of the moon were observed and seven of them were successfully recorded. One of the events, the disappearance of v Geminorum star produced a good data and the projected angular separation of the binary star system was measured to be 0.048 ± 0.08 arc-seconds at the position angle of (194.5 ± 1.67)° which agrees with previous measurements made by much bigger telescopes and more advanced techniques such as the speckle interferometry and adaptive optics. This result shows a potential in the future of high angular resolution measurement using the readily-available astronomical equipment in the observatories in Malaysia, compared to direct observation techniques. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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