The star Y Canum Venaticorum. It is a semiregular variable red supergiant of type SRB ranging between 5th and 7th magnitudes with a period of about 9 months. It was named by P. A. Secchi for its remarkable spectrum. It lies about 1000 l.y. away
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。