Swedish physicist Kai M. Siegbahn (b. 1918) was awarded the Nobel Prize for physics in 1981 for his contribution to the development of high-resolution electron spectroscopy. The name was suggested by W. A. Fröger.
Discovered on 16-10-1977 in Palomar by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T.