churyumov-gerasimenko

Description

more at http://scitech.quickfound.net/astro/project_apollo.html Reupload of a previously uploaded film with improved sound and video, and all in one piece instead of parts. "Describes, with animation, the planning of a lunar mission with trajectories and physical capabilities that define these trajectories. Emphasizes launch windows and Earth reentry." NASA film JSC-336 Public domain film from NASA, slightly cropped to remove uneven edges, with the aspect ratio corrected, and mild video noise reduction applied. The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original). PROJECT APOLLO PLAYLIST: http://www.youtube.com/playlist?list=PL7D6A4FBE35C88581 NASA .pdf: "Summary of Launch Window Constraints for Apollo" http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19790072214_1979072214.pdf http://en.wikipedia.org/wiki/Launch_window Launch window is a term used in spaceflight to describe a time period in which a particular launch vehicle (rocket, Space Shuttle, etc.) must be launched. If the rocket does not launch within the "window", it has to wait for the next window. For trips into largely arbitrary Earth orbits, almost any time will do. But if the spacecraft intends to rendezvous with a space station (such as the International Space Station) or another vehicle already in an orbit, the launch must be carefully timed to occur around the times that the target vehicle's orbital plane intersects the launch site. For launches above low Earth orbit (LEO), the actual launch time can be somewhat flexible if a parking orbit is used, because the inclination and time the spacecraft initially spends in the parking orbit can be varied... To go to another planet using the simple low-energy Hohmann transfer orbit, if eccentricity of orbits is not a factor, launch windows are periodic according to the synodic period; for example, in the case of Mars the period is 2.135 years, i.e. 780 days. In more complex cases, including the use of gravitational slingshots, launch windows are irregular. Sometimes rare opportunities arise such as when Voyager 2 took advantage of a 175 year planetary alignment (launch window) to visit Jupiter, Saturn, Uranus and Neptune. When such an opportunity is missed, another target may be selected. For example, the Rosetta mission of ESA was originally intended for comet 46P/Wirtanen, but a launcher problem delayed it and a new target had to be selected (comet 67P/Churyumov-Gerasimenko). Launch windows are often calculated from porkchop plots that show the delta-v needed to achieve the mission, plotted against the launch time. The term 'launch window' is often used metaphorically, particularly in economics, to describe the launch of a product, the 'window' describing a key opportunity for the product to be released. For example, a film may be scheduled for release in the summer - a popular time for films- but if there is a problem in development, it might miss that launch window and make less of a profit. Specific issues Space Shuttle missions to the International Space Station were restricted by beta angle cutout. Beta angle (\beta) is defined as the angle between the orbit plane and the vector from the Sun. Due to the relationship between an orbiting object's beta angle (in this case, the ISS) and the percent of its orbit that is spent in sunlight, solar power generation and thermal control are affected by that beta angle. Shuttle launches to the ISS were normally only attempted when the ISS is in an orbit with a beta angle of less than 60 degrees.