Orbit insertion burn design has been finalized: @OSIRISREx will fire its thrusters to enter orbit about Bennu at 19:43:55 UTC (14:43:55 EST) tomorrow, December 31st! The engines will burn for 8 seconds. pic.twitter.com/gSI24og2Ix

— KinetX SNAFD (@KinetXSNAFD) December 31, 2018