1293 Sonja was discovered by Eugne Joseph Delporte, a Belgian astronomer born in Genappe, at Uccle Observatory, in 1933.
It was discovered on 26 September 1933, by Belgian astronomer Eugene Delporte at Uccle Observatory in Belgium. Eugene Joseph Delporte (10 January 1882  19 October 1955) was a Belgian astronomer born in Genappe. 
Eugene Joseph Delporte (10 January 1882  19 October 1955) was a Belgian astronomer born in Genappe. E. Delporte Uccle Obs. 26 September 1933 
