Trans Lunar Injection (TLI) is a term describing the propulsion maneuver used to set a spacecraft on a trajectory which will intersect the Moon.
The spacecraft is usually in a parking orbit around Earth at the time of TLI.
The maneuver is usually performed by a rather large rocket engine. On the Apollo missions it was performed by the restartable third (S-IVB) stage of the Saturn V rocket. This particular TLI burn lasted approximately 346 seconds, providing 10,000 to 10,600 ft/s (3 to 5 km/s) of delta-v, at which point the spacecraft was travelling at approximately 24,500 mph (39,420 km/h).
Total gas contribution to the lunar atmosphere is 720 tons/month, for a pressure contribution of 0.6 nanotorr.
The contribution to the lunar atmosphere is 0.78 nanotorr.
The total contribution to the lunar atmosphere from the assumed industrial facility producing both oxygen and helium 3 is 2.5 nanotorr (see Table 1), a factor of 5-100 higher than the "natural" daytime atmosphere.
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