Observations of the J=1-0 transition line of HCN were made at the center of Comet C/1995 O1 (Hale-Bopp) from November, 1996 to April, 1997 with the 14-m radio telescope at the TRAO (Taeduk Radio Astronomical Observatory). From the obtained data, an HCN production rate at each observed date was derived. The rapid variation of the HCN production rate near the perihelion was detected, and it is thought to be caused by jet(s) from the nucleus. The correlation between the visual magnitude and the HCN production rate is found to be QHCN=27.03−0.11(mv−5logΔ) QHCN=27.03−0.11(mv−5logΔ) .

• 김봉규(천문대) | KIM BONG GYE (Korea Astronomy Observatory)
• 김효령(천문대) | KIM HYO RYUNG (Korea Astronomy Observatory)
• 조세형(천문대) | CHO SE HYUNG (Korea Astronomy Observatory)
• 김상준(경희대학교 우주과학과) | KIM SANG JOON (Department of Astronomy & Space Science, Kyung Hee University)