The Delta Scuti stars BU Cnc and EP Cnc in the Prasepe cluster were   observed during 7th through 26th of February 1989. Photoelectric data of 5   observatories were obtained on this multisite campaign : 

• 0.5 meter telescope at the Devon Astronomical Observatory, Canada (observers B. Martin and D.P. Hube)
• 0.6 meter telescope of Sierra Nevada Observatory (R. Garrido)
• 0.6 meter telescope at the Xing-Long station of Beijing Observatory, China (Jiang Shi-yang and Li Zhi-ping)
• 0.6 meter Morgan telescope at Lowell Observatory, USA (W. Ostermann)
• 1.0 meter RCC telescope of Piszkestetö, the mountain station of Konkoly Observatory, Hungary (M. Paparo)

Publications following this campaign :

• Nonradial pulsation of the Delta Scuti star BU Cnc in the Prasepe cluster (M. Breger et al), 1993, A&A 271, 482
• EP Cnc: a nonradially pulsating Delta Scuti star in the Prasepe cluster (M. Breger et al), 1994, A&A 281, 90