Launch considerations @SHAR
We are going to run a short series of posts on launch considerations, lunar trajectory, landing site and then some.
Our launch provider was pre-selected for us - ISRO's PSLV!
For PSLV Satish Dhawan Space Center's (SHAR) launch pad at Sriharikota as the designated launch station. Launch vehicle ascent trajectories are designed to ensure none of the spent launch vehicle articles fall on populated areas / landmasses. Which is the reason all launch pads are on a sea coast, the outer boundaries of such an ascent trajectory, typically, over the sea define the ‘Range Safety’ region. This restricts the allowable inclinations of any planned launch. In case the payload to be launched requires an inclination outside this region, the launch vehicle continues down the range safety region, gains altitude then makes a yaw maneuver or a plane change before inserting the payload into required inclination.
Polar orbit launches from SHAR begin with a 140N Azimuth, that's approximately 50 degree inclination passes by Sri Lanka then performs a dog-leg maneuver to get into 98 deg inclination. Equatorial orbit launches start at 132N, that's approximately -42 degree inclination, continues straight down the range and performs a yaw maneuver 'around' the Indonesian islands to get to 18 deg orbits.
Additional considerations, as SHAR is located on the east coast, payloads are typically launched towards the east in the morning. This allows the launch vehicle to take advantage of Earth’s rotation and the Sun’s gravitational pull for the final injection maneuver.
Team Indus' GLXP Mission will use the 132N Azimuth, on an early morning launch sometime in 2015.
Next up more about the "injection" into a Trans-Lunar trajectory.
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