|Mission type||Weather satellite|
|Mission duration||Launch failure|
|Launch mass||571.5 kilograms (1,260 lb)|
|Start of mission|
|Launch date||May 18, 1968, 00:00UTC|
|Launch site||Vandenberg SLC-2E|
Nimbus B was a meteorological satellite launched as part of the Nimbus program. It was released on May 18, 1968 from the Vandenberg Air Force Base, Lompoc, California, by means of a Thor-Agena launch vehicle, together with the SECOR 10 satellite. Nimbus B never achieved orbit because of a malfunction in the booster guidance system forced the destruction of the spacecraft and its payload during launch.