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24 kwi 2018 · According to this website I drew up a timeline of Mars transfer windows and the time you'd need to stay on Mars before the next return window: Blue to red arrows are Earth to mars transitions, red to blue the opposite. Yellow boxes are amount of time on Mars.
Launch windows calculated from trajbrowser.arc.nasa.gov. Maximum total ΔV = 7 KM/S | Maximum mission duration (Earth to Mars) : 240 days. We have 5 spaceflight launch windows to go from Earth to Mars between 2020-2030: Q3 2020: Unfortunately, Starship will not be ready for this window.
Figure 1 shows windows for Earth-Mars transfers between 2015 and 2025. The blue line shows the sum of hyperbolic excess velocity in Earth departure and Mars arrival.
To make sure the spacecraft and Mars arrive at the same place at the same time, the spacecraft must launch within a particular window of time. This window is called the “launch window” and, depending on the target, can be a few minutes or as much as a few weeks in length.
Going to Mars •Launch opportunity every 2 years (21 day window) •Distance: 175 million kilometers •Speed: 95,000 km/hr •Trip length: 7 months •Navigational course corrections (extreme precision required) •Resolve spacecraft velocity to 0.1 mm/s and angle to 2.5 nano-radian (a 1 km landing zone) July 2020 launch
3 lut 2018 · While the launch window for a single mission isn't, logistically speaking, exactly the same thing as the span of a set of missions within a single 26-month opportunity cycle, they are closely related. Four separate Mars-bound launches occurred over about 3-week spans in each of the 1971 and 1973 opportunities: 1971 . Mariner 8, 9 May 1971 (USA)
Launch period. To go to another planet using the simple low-energy Hohmann transfer orbit, if eccentricity of orbits is not a factor, launch periods are periodic according to the synodic period; for example, in the case of Mars, the period is 780 days (2.1 years).
