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K.Klaus, M. L. Raftery and K. E. Post, the Boeing Company, 13100 Space Center Blvd, Houston TX 77059 [email protected], Mi

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K.Klaus, M. L. Raftery and K. E. Post, the Boeing Company, 13100 Space Center Blvd, Houston TX 77059 Kurt.K.Klaus@Boeing.Com, Mi An Affordable Mars Mission Design K.Klaus, M. L. Raftery and K. E. Post, The Boeing Company, 13100 Space Center Blvd, Houston TX 77059 [email protected], [email protected], [email protected]. Introduction: The International goal of sending human explorers to Mars. Key ndings of a 2013 Humans to Mars ultimately represent a risk to the human Mars landing objective. Strategic knowledge Mars Sample Return Mission MAV Derived space community has declared that conference panel discussion on mission architectures were; 1) A human mission to gaps for human missions to Mars have been studied by various groups, most recently Concept: Mars sample return (MSR) is Lunar Lander our unied long term goal is for a Mars is on the same order of magnitude as the effort it took to build the International the Mars Exploration Program Analysis Group (MEPAG).[4] For the life support and one of the highest priorities of the human mission to Mars but major Space Station (ISS); a substantial effort but one that is likely affordable in the current crew accommodation equipment, the ISS can be used to reduce risk for the Mars Science Mission Directorate at NASA. work remains to dene how it will be budget environment; 2) An inclusive, international process should be used to establish mission. Subsystem equipment can also be tested on ISS, but ultimately, human [6] As a stepping stone to Mars, the done. We will describe a “stepping the exploration objectives and dene the experience in the deep space MSR mission could provide valuable stone” based approach that charts a capabilities that are needed to achieve environment is needed. Initial information about the Martian path starting at ISS operations today them; 3) As with ISS, an international missions with the Orion and atmosphere, weather, geology, and and ultimately leading to a crewed partnership is seen as a key enabling SLS will allow short duration potential landing sites. mission to the surface of Mars. feature of the plan. All partners exposure for crews to deep A lunar landing could also be on the Translunar infrastructure and heavy participating in the plan should be given space but longer duration path to Mars. The Moon could be used lift capability are key to this approach opportunities to prove their capabilities as missions representative of a trip as a testbed for the surface systems and we will show links to other relevant work in this area.[1] A human Mars architecture part of this “stepping stone” approach; 4) to Mars will require a habitat. and lander propulsion systems which provides a framework and guidance from which to progress through a myriad of Heavy-lift launch capability will be Recent analysis has suggested MAV Derived will ultimately be needed for Mars. Delta Lunar Lander investigations, concept designs, analysis, and testing that lead to new and innovative needed in order to provide a reasonable that a habitat-based gateway in velocity requirement for the Mars ascent ways of approaching space exploration, and human space travel in particular. Along the number of assembly ights and thereby a translunar space would be Cislunar Gateway as a Stepping vehicle is about 5000 meters/second; way, triumphs and tribulations, expressed as testing failures and/or the threat of project reasonable prospect of success. helpful as an assembly node for Stone to the Moon and Mars very close to what would be needed for funding cuts, interweave the human experience into the long-term goal of visiting Mars. Mars and for many other Asteroid Retrieval Mission Concept a reusable lunar lander.[7] In short, a manned mission to Mars will engage the public. [2] Stepping Stones to Mars: A human mission to Mars will require the development of a missions as well.[5] set of new capabilities and steps must be taken to mature and prove out these new Finally, the moons of Mars itself would capabilities. We will show a step-wise plan developed by the European Space Agency Asteroid Retrieval Mission: provide an excellent stepping stone to which would address this need. An asteroid retrieval mission the surface.[8] As a “shake-down” could play a useful role in cruise before landing, a mission to ESA Step-wise Approach: This plan was preparing for a Mars mission. Deimos or Phobos would test all of the developed as part of the effort to dene One of the key technologies systems except those needed to get to The surface of Mars from the Curiosity Rover (Dingo Gap) the Global Exploration Roadmap whose needed for Mars is a high power the surface and back. This test would provide condence for the in-space second update has just recently been solar electric propulsion (SEP) transportations and crew habitat systems. [9] Mars as our Primary Objective: Mars as a destination for human exploration has released.[3] Early crewed missions are system. Current designs for the captured the imagination of the world for decades. It is important to establish the augmented with robotic precursor asteroid retrieval mission An Affordable Mission Concept: We will present a conceptual framework for an exploration objectives through an inclusive international process, to dene what missions to test capabilities and evaluate feature a “rst generation” SEP affordable Mars mission system. There are six basic elements of a Mars mission system; capabilities are needed, and to develop them through incremental steps in exploration potential landing sites. These precursor system which could form the 1) Orion; 2) Space Launch System (SLS); 3) Transit Habitat; 4) Solar Electric Propulsion missions. Each mission should be compelling, while demonstrating technologies needed missions are designed to address foundation of the larger SEP (SEP) Tug; 5) Mars Ascent Vehicle (MAV); 6) Mars Lander. Two of the six elements are for Mars. It should be readily apparent how each mission contributes to the long term Strategic Knowledge Gaps (SKGs) which systems needed for Mars. currently funded for development and the other four represent improvements or scaled-up versions of systems that are operational today. IMAGE CREDIT TO ESA The SLS is used to launch The lander uses its Element Phasing 1 Element Phasing 3 4 Cargo Lander during the rst SEP tug and the Hypersonic Inatable Aero Descent cargo lander with the Aerodynamic Decelerator surface habitat to low (HIAD) to decelerate the earth orbit. vehicle for landing. Orion Transit Habitat Mars Ascent Vehicle 2 Spiral out to EML-2 The cargo mission The SEP tug is activated Cargo Lander during 5 provides a good test and used to deploy the Terminal Phase for most of the major lander out to the translunar elements that the crew assembly site. The second will need for landing. SLS launch deploys the Departure windows for TransHab and the return Cargo Departure for Mars Mars open about every Space launch System SEP Tug Mars Lander kick stage directly to All four elements of the cargo mission leave for Mars when the departure window 25 months so while the Phase 1 - Earth’s Phase 2 - In-Space Phase 3 - Mars the Gateway. opens. The cargo trip takes ~500 days because only the SEP tug is used to power cargo mission is Gravity Well Elements Gravity Well the trip. The return kick stage will stay in Mars orbit waiting to be used for the crew en-route to Mars, the To illustrate how these six elements could be used to accomplish a return. When the cargo mission reaches Mars, the SEP tug is used to spiral down to human mission is Mars mission we will briefly describe the sequence of events: 5000Km altitude for the cargo lander entry. being prepared. 6 Launch of the Crew Lander 7 8 9 Expedition Crew Arrives at Gateway Expedition Crew Departing for Mars Crew During Entry The translunar Gateway provides a small measure of infrastructure which is used to The crew Mars transfer spacecraft is equipped with a kick stage to help boost the transfer The human mission starts in much the same way as the cargo mission, with the support assembly, store fuel, and respond to contingencies. The Gateway allows performance. For comparison, while the cargo transfer to Mars takes ~515 days for the The crew must land fairly close to the habitat if they are going to stay on the launch of the SEP tug and the MAV lander. All the elements for the crew mission NASA and the partner agencies some measure of operational exibility to resolve trip to Mars, the crew transfer is ~256 days or roughly half. With the exception of the surface for their full duration mission. are assembled at the Gateway and the Expedition crew is the last to launch. off-nominal situations and ensure readiness before the nal mission commitment at shorter transit time, the crew transfer to Mars looks very similar to the cargo transfer that the trans-Mars injection (TMI) burn. Once the TMI maneuver is performed, the crew is preceded it. Once at Mars, the SEP stage will spiral down to 5000Km altitude to release committed to at least a two year expedition. the crew lander. The landed mass for both the crew and cargo lander is ~40 tons. 10 Crew on the Surface of Mars 11 Crew Departing from Mars 12 Departing from Mars 13 for the Journey Home The Mars Curiosity mission was able to land within 3 Km of its target so it seems The MAV is a three stage vehicle with the crew cabin acting as the third stage. Conclusions: The release of the Global Exploration Roadmap (GER) has made clear References: [1] Raftery M. L. et. al.
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