Encyclopedia Astronautica
DSE-Alpha



zsoylun5.jpg
DSE-Alpha
Circumlunar Soyuz-Block DM Tourism Spacecraft
Credit: © Mark Wade
Russian manned lunar flyby spacecraft. Study 2005. Potential commercial circumlunar manned flights were offered in 2005, using a modified Soyuz spacecraft docked to a Block DM upper stage.

The customer would be shot around the moon as early as 2008 at a price of $100 million. Soyuz had already been proven for this role under the L1 program in the 1960's.

In August 2005 Energia, in collaboration with Space Adventures / Deep Space Expeditions announced the potential offering of flights around the moon to millionaires able to afford the $ 100 million price tag. Dusting off the work of the 1960's that resulted in the Soyuz being qualified for manned circumlunar flight, the new version proposed two mission profiles:

The baseline Direct Staged Mission would run as follows:

  • Day 1: Launch of a Soyuz TMA spacecraft by a Soyuz 11A511U booster into low earth orbit.
  • Day 2: Launch of Block DM upper stage by a Zenit-3 launch vehicle. After the Block DM's parking orbit parameters were verified, the Soyuz TMA began to maneuver to rendezvous with the upper stage.
  • Day 3: The Soyuz docked with the Block DM. After check-out, the Block DM fired to propel the Soyuz on a trans-lunar trajectory. After burn-out, the Soyuz undocks from the upper stage and continues on its ballistic course toward the moon.
  • Days 4-5: Coast to the moon. The Soyuz makes mid-course maneuvers as necessary.
  • Day 6: Loop around the moon at a considerable altitude. The Soyuz did not have the propellant capacity to enter lunar orbit, so the surface passed by below in an encounter of just a few hours.
  • Days 7-8: The long fall back towards earth, with midcourse corrections as needed.
  • Day 9: Re-entry in the earth's atmosphere. Presumably the Soyuz would make the double-dip trajectory over one of the earth's poles perfected by the L1 Zond spacecraft in the 1960's.
Another, more expensive variant of the mission foresaw the Soyuz spending two weeks at the International Space Station prior to the lunar mission - a total of 3 weeks in space, in earth orbit, and around the moon.

For the L1 circumlunar program of the 1960's, Korolev sold the idea based on a single Proton booster launch. This would orbit a Block D upper stage with an L1 manned spacecraft (a stripped Soyuz). After a time in parking orbit, the Block D would fire to send the L1 around the moon. Later his design bureau developed the podsadka alternative. First the Proton would boost an unmanned Block D and L1 into low earth orbit. Then an orbital version of Soyuz would be launched separately on an 11A511U booster and rendezvous and dock with the L1/Block D in orbit. Then the crew for the L1 would transfer form the Soyuz, the Soyuz would undock, the Block D would fire to send the L1 toward the moon. It would have been simpler to follow the 2005 scenario - orbit a Block D with a docking collar, then have the Soyuz launch separately, dock with the Block D, and set off for the moon. Evidently there was no time during the space race to modify the Block D to handle the extra propellants required for such a scenario.

A quick calculation shows that such a mission was right at the edge of the capability of the described spacecraft. A fully-fuelled Block DM, fitted with a docking collar and avionics, would be well beyond the payload capacity of the Zenit two-stage booster for the mission described. The Block DM would have to fire briefly after separation form the Zenit-2 second stage to put itself into parking orbit. The Soyuz itself (presumably with a two-man crew) would have to be lightened by several hundred kilograms from its basic orbital version.

The DSE-Alpha mission was just the first and easiest possibility, a kind of test of the market. Presumably subsequent Lunar Orbit or Lunar Landing flights would be designated DSE-Beta and DSE-Gamma...

Characteristics

Crew Size: 2.

AKA: Soyuz Circumlunar.
Gross mass: 25,000 kg (55,000 lb).

More... - Chronology...


Associated Countries
See also
  • Manned Circumlunar Boosting a manned spacecraft on a loop around the moon, without entering lunar orbit, allows a trip to be made near the moon with a total low earth orbit mass of as little as 20 tonnes. This was attractive during the space race as a manned mission that could be accomplished early with limited booster power. Gemini, Apollo, and Soyuz were all supposed to have made circumlunar flights. Only Soyuz reached the circumlunar flight-test stage under the L1 program. Any L1 manned missions were cancelled after the Americans reached lunar orbit with Apollo 8. The idea was resurrected in 2005 when a $100 million commercial flight around the moon was proposed, again using Soyuz. More...
  • Soyuz The Russian Soyuz spacecraft has been the longest-lived, most adaptable, and most successful manned spacecraft design. In production for fifty years, more than 240 have been built and flown on a wide range of missions. The design will remain in use with the international space station well into the 21st century, providing the only manned access to the station after the retirement of the shuttle in 2011. More...

Associated Manufacturers and Agencies
  • Korolev Russian manufacturer of rockets, spacecraft, and rocket engines. Korolev Design Bureau, Kaliningrad, Russia. More...

Bibliography
  • Deep Space Expeditions Web Site, Web Address when accessed: here.

Home - Browse - Contact
© / Conditions for Use