Hohmann Tansfer Trajectory

Hohmann Transfer Ascent

In Hohmann transfer orbit  , the satellite and the last stage of rocket first attains a low altitude circular parking orbit,just outside the densest part of atmosphere, usually this orbit is about 200 km or more, In most launches this altitude is taken to be 185km , shortly after parking orbit injection ,the vehicle is injected into an elliptic transfer trajectory , at perijee , this transfer ellipse is tangential to the parking orbit and at apogee tangential to the required satellite orbit. This transfer orbit is proposed by W.Hohmann , therefore is called "Hohmann transfer trajectory"