In this paper we present the prediction of the first lunar crescent visibility using contrast based on Schaefer’s model and best time proposed by [12] for the beginning of Ramadhan and Syawal 1431 H at observing place in Bosscha Observatory, [E 107° 36.96’, S 6° 49.55’, with elevation of 1310 meters above sea level]. The geocentric altitude of the Moon at the sunset time on August 10 is 1° 58.98’ and illuminated fraction of crescent On August 11, 2010 the altitude of the Moon at the sunset time is 15° 42.71’ and The calculated contrast on August 10, 2010 is less than zero. It means that the brightness of the moon is smaller than brightness of the sky. Based on the contrast value, it is impossible to observe the lunar crescent by the naked eye at that time, even equipped by special design telescope for the crescent observation at Bosscha Observatory. Sultan [11] proposed a predicted model it is still possible to observe the very young lunar crescent even under circumstance before the time of sunset, if the contrast of sky is perfect. On August 11, 2010 contrast has its maximum at 50 minutes after sunset. The result of observation of the lunar crescent at Bosscha Observatory, the crescent could be seen before sunset at 17.15 local time using special design telescope with additional nose of 1 meter length [6]. The model used here is tend to predict the brightness for naked eye observation, which less contrast compare to observation with the well design telescope.
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23 December 2010
THE 4TH ASIAN PHYSICS SYMPOSIUM—AN INTERNATIONAL SYMPOSIUM
12–13 October 2010
Bandung, West Java, (Indonesia)
Research Article|
December 23 2010
Contrast Threshold of Lunar Crescents Visibility for Ramadan and Syawal 1431 H at Bosscha Observatory
E. P. Arumaningtyas;
E. P. Arumaningtyas
aGraduate Student of Astronomy Study Program, Faculty of Mathematics and Natural Science, ITB
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M. Raharto
M. Raharto
bAstronomy Research Division, Faculty of Mathematics and Natural Science, ITB
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AIP Conf. Proc. 1325, 117–120 (2010)
Citation
E. P. Arumaningtyas, M. Raharto; Contrast Threshold of Lunar Crescents Visibility for Ramadan and Syawal 1431 H at Bosscha Observatory. AIP Conf. Proc. 23 December 2010; 1325 (1): 117–120. https://doi.org/10.1063/1.3537875
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