(29075) 1950 DA is a near Earth asteroid. It is notable for having the highest known probability of impacting Earth, according to the Palermo Technical Impact Hazard Scale (although this probability remains low). For a few days in December 2004 it was temporarily surpassed by 99942 Apophis (which at the time was named only by its provisional designation ).
The asteroid has been given the number 29075, but does not yet have a name. Wirtanen had naming rights as the original discoverer; upon his death, naming rights reverted to the IAU, which may assign a name in the future.
The studies showed that the asteroid has a mean diameter of 1.1–1.4 km. Optical lightcurve analysis by Lenka Sarounova and Petr Pravec shows that its rotation period is 2.1216 ± 0.0001 hours. Due to its short rotation period and high radar albedo, 1950 DA is thought to be fairly dense (more than 3 g/cm³).
The energy released by a collision with an object the size of 1950 DA would cause major effects on the climate and biosphere which would be devastating to human civilization. The discovery of the potential impact has heightened interest in asteroid deflection strategies.