We developed an observation program for a 2K CCD camera, which was newly attached at the SOAO (Sobaeksan Optical Astronomy Observatory) 61cm telescope. The program was designed to control the telescope as well as the CCD camera and to monitor the CCD image quality, with very easy under the window-based graphical user interface (GUI). Furthermore, applying the automated differential photometric algorithm, we can obtain the instrumental magnitudes of several variable and comparison stars in real-time. Simultaneous photometry enables us to get precise differential magnitudes of variable stars even if the weather condition is not photometric. This new observation system has been using for many astronomical observations from September, 2001.

• 김승리(한국천문연구원) | SEUNG-LEE KIM (Korea Astronomy Observatory)
• 경재만(한국천문연구원) | JAE-MANN KYEONG (Korea Astronomy Observatory)
• 권순길(한국천문연구원) | SUN-GIL KWON (Korea Astronomy Observatory)
• 윤재혁(한국천문연구원) | JAE-HYOUK YOUN (Korea Astronomy Observatory)