M. A. Sharaf

Department of Astronomy, Faculty of Science, King Abdulaziz University, Jeddah, KSA

A. S. Saad

Department of Astronomy, National Research Institute of Astronomy and Geophysics, Cairo, Egypt
Department of Mathematics, Preparatory Year, Qassim University, Buraidah, KSA

J. A. Basabrain

Department of Statistics College of Science for Girls, King Abdulaziz University, KSA