DSE-Alpha

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Deep Space Expedition Alpha (DSE-Alpha), is the name given to the mission proposed in 2005 to take the first space tourists to fly around the Moon. The mission is organized by Space Adventures Ltd., a commercial spaceflight company. The plans involve a modified Soyuz capsule docking with a booster rocket in Earth orbit which then sends the spacecraft on a free return circumlunar trajectory that circles around the Moon once. While the price was originally announced in August 2005 to cost US$100 million per seat, Space Adventures founder Eric Anderson announced in January 2011 that one of the two available seats had been sold for $150 million. Launch is currently being targeted for 2017.[1][2]

Concept[edit]

The use of the Soyuz spacecraft makes sense in many ways; the original Soyuz design of 1962 was specifically intended for circumlunar travel. In the late 1960s a stripped down Soyuz variant, under the name Zond, made several attempts at circumlunar flight, with eventual success.

The DSE proposal is to launch the Soyuz with one crew member and two passengers aboard; a Zenit rocket booster will then be launched carrying a rocket stage weighing up to 14.5t, to dock with the Soyuz and propel it to circumlunar velocity. Two different flight profiles were originally proposed by Space Adventures. The direct-staged profile, lasting about 8–9 days, would involve docking to the booster stage intended to propel the craft and direct departure for the Moon. A proposed timeline for such a flight plan is as follows:[3]

The other profile, lasting about 9–21 days, would incorporate a several day visit to the International Space Station into the flight plan before rendezvousing with the booster stage and departing for the Moon.

The Soyuz spacecraft used for the mission would be modified from the orbital Soyuz, with a thicker and more durable heat shield and a Yamal satellite communications system. The Block DM booster would use an automatic docking system for the rendezvous with the Soyuz in low-earth orbit.[4]

On June 28, 2007 Space.com reported that two individuals had displayed interest in purchasing seats with contract negotiations expected to be concluded by the end of the year.[5] In January 2011, Space Adventures founder Eric Anderson announced that one of the two seats on the flight had been sold at a price of US$150 million, and negotiations for the second seat were under way, with the flight targeted for a 2015 launch.[1]

Criticism[edit]

Mark Wade, author of the Encyclopedia Astronautica, has argued, however, that the Zenit rocket is not powerful enough for this mission and that the larger Proton rocket will in fact be needed. These same calculations have also shown that a fully fueled and outfitted Block DM would be beyond the capabilities of the Zenit rocket, and the DM would have to fire for a short time in order to stabilize its orbit.[3]

See also[edit]

References[edit]

  1. ^ a b Whittington, Mark (29 January 2011). "Space Adventures Closer to Private 'Round the Moon Voyage". Yahoo! News. Retrieved 29 March 2011. 
  2. ^ http://www.spaceadventures.com/index.cfm?fuseaction=Lunar.welcome
  3. ^ a b "DSE-Alpha". Encyclopedia Astronautica. Retrieved 29 March 2011. 
  4. ^ Boyle, Alan (29 September 2005). "Russia thriving again on the final frontier". MSNBC. Retrieved 31 March 2011. 
  5. ^ David, Leonard (28 June 2007). "Flight Log: The First Private Expedition to the Moon". Space.com. Retrieved 27 August 2010. 

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