Apollo 11 : the NASA mission reports by Robert Godwin

By Robert Godwin

Contains the full group of Apollo 11’s own observations upon returning to earth.

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Extra info for Apollo 11 : the NASA mission reports

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1 ft/sec in all axes. The circularization maneuver was targeted for a 66- by 54-mile orbit, a change from the 60-mile circular orbit which had been executed in previous lunar flights. 4 miles. The ellipticity of this orbit was supposed to slowly disappear because of irregularities in the lunar gravitational field, such that the command module would be in a 60-mile circular orbit at the time of rendezvous. 8 miles, indicating the ellipticity decay rate was less than expected. As a result the rendezvous maneuver solutions differed from preflight estimates.

4 TRANSPOSITION AND DOCKING The digital autopilot was used for the transposition maneuver scheduled to begin 20 seconds after spacecraft separation from the S-IVB. The time delay was to allow the command and service modules to drift about 70 feet prior to thrusting back toward the S-IVB. Separation and the beginning of transposition were on time. In order to assure a pitch-up maneuver for better visibility through the hatch window, pitch axis control was retained in a manual mode until after a pitch-up rate of approximately 1 deg/sec was attained.

Because of the reduced gravity, the positions on the floor and on the engine cover were both quite comfortable. 13 LAUNCH PREPARATION Aligning the platform before lift-off was complicated by the limited number of stars available. Because of sun and earth interference, only two detents effectively remained from which to select stars. Accuracy is greater for stars close to the center of the field, but none were available at this location. A gravity/one-star alignment was successfully performed. A manual averaging technique was used to sample five successive cursor readings and then five spiral readings.

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