The 1934 NP is a  35 kilometers in diameter, C-type stony asteroid discovered on 10 April 1950 by Ernest Johnson in Johannesburg Observatory that was named after Sandra Johnson.
C The original classification system had three categories: C-types for dark carbonaceous objects (75% of known asteroids), S-types for stony (silicaceous) objects (17% of known asteroids) and U for those that did not fit into either C or S. This classification has since been expanded to include many other asteroid types. 
