Developed by the US Naval Academy and NASA, from 1987 to 1988, Longshot was designed to be built at Space Station Freedom, the precursor to the existing International Space Station. Similar to Project Daedalus, Longshot was designed with existing technology in mind, although some development would have been required; for example, the Project Longshot concept assumes "a three-order-of-magnitude leap over current propulsion technology".[1]
Missionedit
Unlike Daedalus, which used an open-cycle fusion engine, Longshot would use a long-lived nuclear fission reactor for power. Initially generating 300 kilowatts, the reactor would power a number of lasers in the engine that would be used to ignite inertial confinement fusion similar to that in Daedalus. The main design difference is that Daedalus also relied on the fusion reaction to power the ship, whereas in the Longshot design the internal reactor would provide this power.[1]
The reactor would also be used to power a laser for communications back to Earth, with a maximum power of 250 kW. For most of the journey, this would be used at a much lower power for sending data about the interstellar medium; but during the flyby, the main engine section would be discarded and the entire power capacity dedicated to communications at about 1 kilobit per second.
Longshot would have a mass of 396 tonnes (873,000 lb) at the start of the mission including 264 tonnes of helium-3/deuterium pellet fuel/propellant. The active mission payload, which includes the fission reactor but not the discarded main propulsion section, would have a mass of around 30 tonnes.
A difference in the mission architecture between Longshot and the Daedalus study is that Longshot would go into orbit about the target star, while the higher-speed Daedalus would do a one shot fly-by lasting a comparatively short time.
A travel to Alpha Centauri with a Longshot spacecraft would take about one century.
^ abc"Project Longshot". Real Clear Science. United States. 22 April 2014. Retrieved 9 June 2016.
Bibliographyedit
Beals, K. A., M. Beaulieu, F. J. Dembia, J. Kerstiens, D. L. Kramer, J. R. West and J. A. Zito. Project Longshot: An Unmanned Probe To Alpha Centauri. U S Naval Academy. NASA-CR-184718. 1988.
External linksedit
Wikimedia Commons has media related to Project Longshot.
The full text of Project Longshot: An Unmanned Probe To Alpha Centauri at Wikisource (This article refers to an Alpha and Beta Centauri as the orbital target of the mission, but the correct nomenclature for these two components of the Alpha Centauri binary star system is Alpha Centauri A and B. Beta Centauri is an entirely different, unassociated star.)
January 01, 1970
project, longshot, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, june, 20. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Project Longshot news newspapers books scholar JSTOR June 2016 Learn how and when to remove this message Project Longshot was a conceptual interstellar spacecraft design It would have been an uncrewed starship about 400 tonnes intended to fly to and enter orbit around Alpha Centauri B powered by nuclear pulse propulsion 1 Initial configurationConfiguration at 33 yearsConfiguration at 67 yearsConfiguration at 100 years Contents 1 History 2 Mission 3 See also 4 References 5 Bibliography 6 External linksHistory editDeveloped by the US Naval Academy and NASA from 1987 to 1988 Longshot was designed to be built at Space Station Freedom the precursor to the existing International Space Station Similar to Project Daedalus Longshot was designed with existing technology in mind although some development would have been required for example the Project Longshot concept assumes a three order of magnitude leap over current propulsion technology 1 Mission editUnlike Daedalus which used an open cycle fusion engine Longshot would use a long lived nuclear fission reactor for power Initially generating 300 kilowatts the reactor would power a number of lasers in the engine that would be used to ignite inertial confinement fusion similar to that in Daedalus The main design difference is that Daedalus also relied on the fusion reaction to power the ship whereas in the Longshot design the internal reactor would provide this power 1 The reactor would also be used to power a laser for communications back to Earth with a maximum power of 250 kW For most of the journey this would be used at a much lower power for sending data about the interstellar medium but during the flyby the main engine section would be discarded and the entire power capacity dedicated to communications at about 1 kilobit per second Longshot would have a mass of 396 tonnes 873 000 lb at the start of the mission including 264 tonnes of helium 3 deuterium pellet fuel propellant The active mission payload which includes the fission reactor but not the discarded main propulsion section would have a mass of around 30 tonnes A difference in the mission architecture between Longshot and the Daedalus study is that Longshot would go into orbit about the target star while the higher speed Daedalus would do a one shot fly by lasting a comparatively short time A travel to Alpha Centauri with a Longshot spacecraft would take about one century See also edit nbsp Spaceflight portal nbsp Space portal Alpha Centauri Bb Breakthrough Starshot Interstellar travel Nuclear pulse propulsion Project Daedalus Project Orion nuclear propulsion Project Icarus Spacecraft propulsionReferences edit a b c Project Longshot Real Clear Science United States 22 April 2014 Retrieved 9 June 2016 Bibliography editBeals K A M Beaulieu F J Dembia J Kerstiens D L Kramer J R West and J A Zito Project Longshot An Unmanned Probe To Alpha Centauri U S Naval Academy NASA CR 184718 1988 External links edit nbsp Wikimedia Commons has media related to Project Longshot nbsp The full text of Project Longshot An Unmanned Probe To Alpha Centauri at Wikisource This article refers to an Alpha and Beta Centauri as the orbital target of the mission but the correct nomenclature for these two components of the Alpha Centauri binary star system is Alpha Centauri A and B Beta Centauri is an entirely different unassociated star Retrieved from https en wikipedia org w index php title Project Longshot amp oldid 1216078959, wikipedia, wiki, book, books, library,
