51826 Kalpanachawla (2001 OB) is an asteroid named for Indian-born astronaut Kalpana Chawla, who died in the STS-107 (Columbia) space shuttle reentry disaster on February 1, 2003. 51826 Kalpanachawla was discovered on July 19, 2001 at Palomar Observatory by the JPL Near Earth Asteroid Tracking Program.
The asteroid went unnamed for at least 20 years.
The asteroid has been known for only 18 years, yet has a name. Thus, it could not have gone unnamed for 20 years.
( z1 name :polarity - :ARG1 ( z2 asteroid ) :duration ( z3 at-least :op ( z4 temporal-quantity :quant 20 :unit ( z5 year ) ) ) )