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  Exploration: Asteroids, Moon and Mars
  [Discuss] NASA's Deep Space Gateway

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Author Topic:   [Discuss] NASA's Deep Space Gateway
Robert Pearlman
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posted 09-17-2017 11:57 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
NASA is looking at building a crew-tended spaceport in lunar orbit within the first few missions of the Space Launch System (SLS) that would serve as a gateway to deep space and the lunar surface. This deep space gateway would have a power bus, a small habitat to extend crew time, docking capability, an airlock, and serviced by logistics modules to enable research.

The propulsion system on the gateway would mainly use high power electric propulsion for station keeping and the ability to transfer among a family of orbits in the lunar vicinity.

The three primary elements of the gateway, the power and propulsion bus and habitat module, and a small logistics module(s), would take advantage of the cargo capacity of SLS and crewed deep space capability of Orion. An airlock could further augment the capabilities of the gateway and could fly on a subsequent exploration mission.

Building the deep space gateway will allow engineers to develop new skills and test new technologies that have evolved since the assembly of the International Space Station. The gateway would be developed, serviced, and utilized in collaboration with commercial and international partners.

carmelo
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posted 09-17-2017 11:57 AM     Click Here to See the Profile for carmelo   Click Here to Email carmelo     Edit/Delete Message   Reply w/Quote
The United States Congress have already approved and funded the Deep Space Gateway?

Robert Pearlman
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posted 09-17-2017 12:18 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
Per a SpaceNews article from July:
The gateway and the transport, though, are currently only concepts and not formal NASA programs. The gateway remains under study, and NASA did not request funding for it as a standalone program as part of its fiscal year 2018 budget request.

SpaceAholic
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posted 09-22-2017 08:33 PM     Click Here to See the Profile for SpaceAholic   Click Here to Email SpaceAholic     Edit/Delete Message   Reply w/Quote
More details on notional EM-3 mission (habitat deploy) reported here.

Robert Pearlman
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posted 09-25-2017 12:01 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
The Canadian Space Agency has proposed adding a solar sail to Gateway.
According to an internal document presented to the ISS Exploration Capabilities Study Team, Canadian specialists believe a solar sail could play a secondary role in orienting the DSG, saving fuel for traditional rocket thrusters designed to maintain the outpost's position. Under this proposal, the main thrust for the station's maneuvers still comes from electric propulsion and traditional liquid propellant engines.

The baseline concept used for initial calculations calls for a rectangular sail spanning an area of about 50 square meters, deployed on the exterior of the station by a robotic arm. This could reportedly save at least 9 kilograms of hydrazine per year needed to keep the outpost correctly oriented in space. Although a relatively small number, 9 kilograms per year adds up over the station's projected 15-year mission, especially when considering the tremendous cost of delivering cargo to lunar orbit.

Robert Pearlman
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posted 09-27-2017 09:04 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
NASA release
NASA, Roscosmos Sign Joint Statement on Researching, Exploring Deep Space

Building a strategic capability for advancing and sustaining human space exploration in the vicinity of the Moon will require the best from NASA, interested international partners, and U.S. industry. As NASA continues formulating the deep space gateway concept, the agency signed a joint statement with the Russian Space Agency, Roscosmos, on Wednesday, Sept. 27 at the 68th International Astronautical Congress in Adelaide, Australia.

This joint statement reflects the common vision for human exploration that NASA and Roscosmos share. Both agencies, as well as other International Space Station partners, see the gateway as a strategic component of human space exploration architecture that warrants additional study. NASA has already engaged industry partners in gateway concept studies. Roscosmos and other space station partner agencies are preparing to do the same.

"While the deep space gateway is still in concept formulation, NASA is pleased to see growing international interest in moving into cislunar space as the next step for advancing human space exploration," said Robert Lightfoot, NASA's acting administrator at NASA Headquarters in Washington. "Statements such as this one signed with Roscosmos show the gateway concept as an enabler to the kind of exploration architecture that is affordable and sustainable."

NASA plans to expand human presence into the solar system starting in the vicinity of the Moon using its new deep space exploration transportation systems, the Space Launch System rocket and Orion spacecraft. This plan challenges our current capabilities in human spaceflight and will benefit from engagement by multiple countries and U.S. industry.

Studies of the gateway concept will provide technical information to inform future decisions about potential collaborations. These domestic and international studies are being used to shape the capabilities and partnering options for implementing the deep space gateway.

The space station partners are working to identify common exploration objectives and possible missions for the 2020s, including the gateway concept. A key element of their study is to ensure that future deep space exploration missions take full advantage of technology development and demonstration enabled by the International Space Station, as well as lessons learned from its assembly and operations.

During the same time period and in parallel, NASA has been engaging U.S. industry to evaluate habitation concepts for the gateway and for the deep space transport that would be needed for Mars exploration. NASA has competitively awarded a series of study and risk reduction contracts under the Next Space Technologies for Exploration Partnerships (NextSTEP) Broad Agency Announcement to advance habitation concepts, technologies, and prototypes of the required capabilities needed for deep space missions. The most recent awards included six U.S. companies; Bigelow Aerospace, Boeing, Lockheed Martin, Orbital ATK, Sierra Nevada Corporation, and Nanoracks. Five of the six firms were selected to develop full-sized ground-based engineering prototypes of habitation systems, expected to be complete in 2018. NASA has also solicited industry proposals for studies on concept development of a power and propulsion element, which would be the first piece of a gateway architecture.

328KF
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posted 09-27-2017 08:40 PM     Click Here to See the Profile for 328KF   Click Here to Email 328KF     Edit/Delete Message   Reply w/Quote
Jeff Foust tweeted:
Talked with Lightfoot briefly after the panel; he confirmed there’s no commitment by NASA and Roscosmos to build the DSG, only study concept.
Based upon NASA's experience with Russia on ISS, I would think there is some hesitancy to rely on Russia to provide any critical hardware in a timely manner. Their latest research module, still on the ground after what? A decade? is a prime example.

They are good at getting crews up to ISS on Soyuz, but the U.S. should have no need for that capability with Orion in service. Certainly, Boeing and SpaceX will be able to supplement that.

SkyMan1958
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posted 10-05-2017 12:35 PM     Click Here to See the Profile for SkyMan1958   Click Here to Email SkyMan1958     Edit/Delete Message   Reply w/Quote
Just wondering, was there any sort of a timeline as to when this would theoretically be deployed? If, and I realize it's a big if, NASA (realistically Congress) plans on putting footprints on Mars in the 2030s, then this sort of station in my opinion would need to be up and running no later than 2025.

Robert Pearlman
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posted 10-05-2017 12:39 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
This chart from March shows a provisional deploy of the Deep Space Gateway by 2025 (2026 with an airlock):

SkyMan1958
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posted 10-05-2017 07:34 PM     Click Here to See the Profile for SkyMan1958   Click Here to Email SkyMan1958     Edit/Delete Message   Reply w/Quote
Thank you for the info Robert.

Robert Pearlman
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From: Houston, TX
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posted 12-01-2017 10:52 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
In January, NASA and 14 international space agencies plan to publish their common goals for exploration, including an extended presence in low Earth orbit, a cislunar habitat, moon missions and eventual excursions to Mars, in an updated Global Exploration Roadmap being drafted by the International Space Exploration Coordination Group (ISECG), reports SpaceNews.
The new Roadmap lays out a three-phase plan. The starting point, Phase 0, is ongoing research and testing on ISS. During Phase 1 in the 2020s, international agencies would explore the lunar vicinity. In that timeframe, NASA would work with partners to construct the Deep Space Gateway, a crewed outpost with less than 10 percent of the habitable volume of ISS, and agencies would send robotic missions to the lunar surface and prepare for human lunar exploration. By Phase 2 in the 2030s, agencies would send exploration missions to orbit Mars.

Under current budget projections, NASA could launch one crewed SLS/Orion flight per year, with each Orion spending approximately 40 days at the Deep Space Gateway, Guidi said. Four SLS missions in the 2020s could assemble elements of the Deep Space Gateway, including its power and propulsion bus, habitat, logistics module and airlock, [NASA advanced exploration systems deputy director John] Guidi said.

SkyMan1958
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posted 12-01-2017 02:36 PM     Click Here to See the Profile for SkyMan1958   Click Here to Email SkyMan1958     Edit/Delete Message   Reply w/Quote
I realize that the International Space Exploration Coordination Group, ISECG, is a coordinating body, so my best guess is it won't run afoul of current US law, but, when checking up on the list of members, I was interested to find out that one of the members is China.

For what it's worth, the following space agencies are ISECG members (in alphabetical order): ASI (Italy), CNES (France), CNSA (China), CSA (Canada), CSIRO (Australia), DLR (Germany), ESA (European Space Agency), ISRO (India), JAXA (Japan), KARI (Republic of Korea), NASA (United States of America), NSAU (Ukraine), Roscosmos (Russia), UKSA (United Kingdom).

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