Astrobotic’s current hypothesis about the Peregrine spacecraft’s propulsion anomaly is that a valve between the helium pressurant and the oxidizer failed to reseal after actuation during initialization. This led to a rush of high pressure helium that spiked the pressure in the oxidizer tank beyond its operating limit and subsequently ruptured the tank. While this is a working theory, a full analysis report will be produced by a formal review board made up of industry experts after the mission is complete. All available data is being downloaded from the lander to support this assessment.
ULA’s Vulcan rocket inserted Peregrine into the planned translunar trajectory without issue. There is no indication that the propulsion anomaly occurred as a result of the launch.