The Space Launch System Capabilities with a New Large ...
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The Space Launch System Capabilities with a New Large Upper StageBenjamin Donahue1 Sheldon Sigmon2
Boeing Exploration Launch Systems, Huntsville, AL 35824
The SLS is the most powerful rocket ever built and provides a critical heavy-lift launch capability enabling diverse deep space p p y p y g p p
missions. The exploration class vehicle launches larger payloads farther in our solar system, faster than ever before possible. A
new 8.4m Large Upper Stage (LUS), as a follow on to the interim Cryogenic Propulsion Stage (iCPS), can provide significant
increases in SLS payload injection capability. The new Large Upper Stage can be built at the Michoud Assembly Facility on the
same 8.4m tooling as the SLS Core stage. In this paper, SLS performance with both the iCPS and LUS are presented, and several
potential new missions are described.
Human Exploration
SLS enables exploration beyond LEO to scientifically valuable deep space destinations including our moon, asteroids and
ultimately Mars. It will launch the Orion Multi-Purpose Crew Vehicle (MPCV), granting unprecedented human access to new
space environments in the pursuit of knowledge and discovery. SLS boasts the most powerful propulsion system in the world,
significantly reducing crew travel time. The heavy-lift rocket is scheduled to take flight in 2017.
ScienceScience
SLS provides a critical new launch capability for planetary science and astronomy
missions expanding our understanding of the universe, the solar system and the
Earth. From large space telescope deployment to sample return missions, SLS’s
superior performance and 5 m to 10 m faring allows utilization of existing systems,
reducing development risks, size limitations and costs. The evolvable rocket
provides the greatest lift capacity system to dateprovides the greatest lift capacity system to date.
Security
SLS is a national security asset enabling the launch of large payloads for
intelligence, surveillance and reconnaissance missions. It provides a significant lift
capability directly to geostationary orbit augmenting current satellite deployment
options In addition to traditional military operations SLS can support globaloptions. In addition to traditional military operations, SLS can support global
asteroid capture or deflection missions to mitigate impact risks to known Earth
approaching objects.
Public-Private Partnerships
SLS is the first launch system in history capable of powdering humans, habitats
and space systems beyond our moon and into deep space Its flexible designand space systems beyond our moon and into deep space. Its flexible design,
superior performance and lift capability supports developing deep space markets
including space based solar power, extraterrestrial resource utilization and space
tourism beyond LEO. SLS reduces mission time and costs, supports a variety of
payloads and is scalable to address diverse exploration needs.
SLS/iCPS Block 1 Configuration
Copyright © 2013 by the Boeing Company. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.
Fig 1. SLS Block 1
SLS/iCPS Block 1 Configuration
Fig.1 - from top: Launch Abort System (LAS); Orion (MPCV), Orion spacecraft
adaptor (SA), Interim Cryogen Propulsion Stage (iCPS), Launch Vehicle
Spacecraft Adaptor (LVSA), Core stage, and two Five Segment Boosters (FSB).
1Boeing Defense, Space & Security (BDS), MC JV-08 Senior Member AIAA. 2BDS, MC JV-08, Advanced programs.
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SLS Summary: Upper Stages and Performance
A new 8.4 meter diameter, Large Upper Stage (LUS) concept is presently under evaluation, data presented here is conceptual and
preliminary. The LUS can be built at the MAF on the same 8.4m tooling as the SLS Core stage. Because of increased thrust and
higher propellant loading increased payload injection capability can be achieved with the LUS A summary of missionhigher propellant loading, increased payload injection capability can be achieved with the LUS. A summary of mission
parameters for the SLS with the iCPS and with the LUS are listed in Table 1; column 1 data is for the initial Block 1 SLS/iCPS
configuration, and columns 2-4 contain data for three variants of the SLS/LUS configuration. BEO injection energies (C3) and
payloads for six destinations are also listed. The three versions of the LUS presented are identical except for the engines, thrust
vector control (TVC), feedlines and thrust structure. A variety of propellant loads were evaluated, but for this presentation LUS
usable propellant was set to 105mt (231,483 lbs). Tank size and propellant loads are identical for all three LUS variants. The LUS
at 264 000 lbs is about 3 5 times the mass of the smaller 5 0m diameter iCPS The three LUS versions are based on three engineat 264,000 lbs, is about 3.5 times the mass of the smaller 5.0m diameter iCPS. The three LUS versions are based on three engine
options, which include:
- the four RL10 C2 engine version (Col. 2), single engine thrust = 24,750 lbf, Isp vac = 462.5 s
- the dual MB-60 engine version (Col. 3), single thrust = 60,000 lbf, Isp vac = 465.0 s
-the single J2X engine version (Col. 4), single thrust vac = 294,000 lbf, Isp vac = 448.0 s
The MB-60 is a O2/H2 expander cycle concept engine that has never entered production.
Table 1. SLS Summary of Capabilities
Column 1 2 3 4
Name 1SLS / iCPS1xRL10B2
SLS / LUS4xRL10C2
SLS / LUS2xMB60
SLS / LUS1xJ2X
LEO final 2 100x975nmi 130x130nm 130x130nmi 130x130nmi
Booster x 2 3 FSB FSB FSB FSB
Core Stage 4 4xRS25 4xRS25 4xRS25 4xRS25
Upper Stage 5Interim Cryogenic
Propul Stage
LargeUpper Stg
LUS
LargeUpper Stage
LUS
Large Upper Stage
LUS
US diameter 6 5.0m 8.4m 8.4m 8.4m
US Usable Prop Load 7 27.1mt 105.0mt 105.0mt 105.0mt
Upper Stage PMF 8 0.883 0.900 0.900 0.895
Total Engine Thrust 9 24,750 lbf 99,000 lbf 120,000 lbf 294,000 lbf
Fairing diameter 10 5.0 m 8.4 m 8.4 m 8.4 m
Payload to LEO 11 70.0 mt 93.1 mt* 97.0* mt 105.2** mtPayload to LEO 11 70.0 mt 93.1 mt 97.0 mt 105.2 mt
Payload TLI C3= -2.0 12 24.0 mt 39.1 mt 39.7 mt 38.5 mt
Payload TMI C3= 11 13 20.2 mt 31.7 mt 32.6 mt 31.6 mt
Fairing dia Outer Planet 14 5.0 m 5.0 m 5.0 m 5.0 m
Payload Europa C3= 91 15 2.9 mt 8.1 mt 8.5 mt 7.1 mt
Copyright © 2013 by the Boeing Company. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.
Payload Titan C3= 106 16 1.8 mt 5.7 mt 6.0 mt 4.6 mt
Payload Uranus C3= 137 17 0.13 mt 1.7 mt 2.0 mt 0.5 mt
*US stage off loaded; 63mt usable prop for LEO mission **95mt usable prop for LEO mission
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Interim Cryogenic Propulsion Stage (iCPS)
SLS Upper Stages
In the following pages iCPS and LUS stages are described and payload performance, stage mass and other parameters are further
quantified. Data is preliminary. SLS mission payload performance listed here are for cargo missions.
The iCPS / Orion combination is pictured in Fig. 2, and the iCPS stage is pictured in Fig. 3. iCPS stage parameters are listed in
Table 2. The iCPS is a derivative of the Delta-IV 5m upper stage presently in production.
Table 2.
Interim Cryogenic Propulsion Stage (iCPS)
Figure 2. iCPS/Orion
Engines 1 x RL‐10 B2
Isp, vac 462.5 sec
Engine thrust, vac 24,750 lbf
Total thrust, vac 24,750 lbf
LH2 dia 5.0 m
LH2 propel 9,051 lbm
Intertank Composite X‐brace
LO2 dia 4.0 m
LO2 propel 52,949 lbm
Copyright © 2013 by the Boeing Company. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.
RCS propel 700 lbm
Dry mass 8,445 lbm
Total mass 71,155 lbm
Fig. 3.
iCPS
Stage
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SLS Block 1: iCPS Cargo Mission Performance
In Fig. 4 SLS/iCPS Block 1 vehicle injection energy (C3) is plotted vs payload. In Fig. 5 masses are listed for the SLS major
elements. For the Block 1 SLS/iCPS configuration, the Core stage delivers the iCPS and payload to a 20 x 975nmi orbit. From
there the iCPS fires to raise the perigee to 100nmi. From 100 x 975nmi the iCPS injects the payload to its destination. In Fig. 4
injection capability for the Delta IV Heavy EELV is also given for comparison
SLS iCPS
Delta-IV HeavyEuropa
Titan
injection capability for the Delta-IV Heavy EELV is also given for comparison.
TLI
Mars
Mars Free Return
LEO
Fig 4.
SLS/iCPS payload vs C3MISSION
Fairing 5.0m dia
Cargo Payload 52.9 klb
(24.0) mt
iCPS Total 71.2 klb
TLI C3 = -2
Usable prop 59.6 klb
Non -usable 2.4 klb
RCS prop 0.7 klb
Dry mass 8.4 klb
PMF 0.880
Interstage 8.4-5.0m
Fig. 5.
SLS / iCPS
Core Total 2,387.0 klb
Usable prop 2,116.9 klb
Non -usable 30.9 klb
Dry mass 220.6 klb
Booster FSB 1,607.8 klb
Startup prop 18.6 klb
Copyright © 2013 by the Boeing Company. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.
major element
masses
Usable prop 1,385.4 klb
Ejected inerts 9.0 klb
Slag 2.0 klb
Dry mass 211.3 klb
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SLS with Large Upper Stage (LUS)
The SLS’s payload capability improves significantly by the addition of a new 8.4m Large Upper Stage (Fig. 6); payload increases
60% to TLI (39 vs 24mt) and 50% to LEO (105 vs 70mt) vs. the Block 1 vehicle. Additional payload enhances future science,
astronomy and human spaceflight missions. Fig. 7 list masses for the SLS/LUS. For the SLS/LUS mission, the Core stage stages
b bi ll d h i i i h i h bi h fi i i j h
Europa
TitanSLS LUS 1xJ2X
SLS iCPS 1xRL10
suborbitally, and the LUS ignites to continue the ascent to a 130 x 130 nmi LEO. From that orbit the LUS fires again to inject the
payload to its destination. In Fig 6 and 7 1xJ2X LUS data is shown. The LUS is described in more detail in the following pages.
TLI
Mars
Delta-IV Heavy
Mars Free Return
LEO
MISSION
Fairing 8.4m dia
Cargo Payload 85.8 klb
(38.5) mt
LUS Total 264.2 klb
TLI C3 = -2
Fig 6. SLS/LUS and SLS/iCPS
C3 vs. Payload
Usable prop 231.5 klb
Non -usable 3.7 klb
RCS prop 1.4 klb
Dry mass 27.6 klb
PMF 0.895
Interstage 8.4m
Fig.7.
SLS/LUS major
Core Total 2,388.4 klb
Usable prop 2,126.5 klb
Non -usable 21.3 klb
Dry mass 222.0 klb
Booster FSB 1,607.8 klb
Startup prop 18.6 klb
Copyright © 2013 by the Boeing Company. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.
j
element massesUsable prop 1,385.4 klb
Ejected inerts 9.0 klb
Slag 2.0 klb
Dry mass 211.3 klb
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SLS Payload SummaryIn Fig. 8 payload is plotted vs C3 for LEO, TLI, Mars (TMI), Mars free return and Europa. The SLS provides a significant
increase in capability vs existing launchers. SLS/LUS can deliver 105.2mt to LEO, 38.5mt to TLI, 31.6mt to TMI, about
20.0mt to Mars free return and 7.1mt to Europa. Payload values are dependant on a multitude of factors all of which are not
LEO
Delta-IV Heavy
SLS / iCPS 1xRL10
SLS / LUS 1xJ2X
addressed in this report; values presented here are preliminary and subject to change.
TLI
Delta-IV Heavy
TLI
Mars
Europa
Mars Free Return
Upper Stage Gravity-loss vs Stack Thrust-to-Weight
LEO departure gravity (g)-loss is plotted vs stack T/W in Fig. 9. For the TLI mission, iCPS/Payload Thrust-to-weight (T/W) in
th 100 975 i LEO i 0 2 LUS/P l d T/W i th 130 130 i LEO i 1 2 f th 1 J2X i d 0 4 f th 4 RL10
Fig. 8. SLS Payload Summary
the 100x975nmi LEO is 0.2; LUS/Payload T/W in the 130x130nmi LEO is 1.2 for the 1xJ2X version, and 0.4 for the 4xRL10.
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Figure 9. Upper Stage LEO departure g-loss vs stack T/W
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SLS Large Upper Stage: Four RL10 Engine Configuration
The Large Upper Stage is an 8.4m diameter O2/H2 stage that can be built at the same MAF site, and on the same 8.4m diameter
tooling, as the SLS Core stage. Building the LUS and Core together offers several economic advantages; principally commonality;
common elements (tank domes, avionics as examples), personnel, processes, testing, and qualification. Three LUS options are
illustrated in Figs. 8-11. The first LUS option presented, the 4xRL10 version, is shown in Fig. 8. All the LUS variants feature a
8.4m LH2 tank and a 5.5m LO2 tank. A range of LUS propellant loads were evaluated; for this report a usable load of 105mt
(231,488 lb) was selected. This 4xRL10 LUS weighs 262,752 lb fully fueled. The Core interstage (8.4m) attaches to the LUS at
the base of the 8.4m LH2 tank aft skirt. The 4 RL10 C1 engines together produce 99,000 lbf thrust.
blTable 3.
Large Upper Stage‐ 4 x RL10 C2
Engines 4 x RL‐10 C2
Isp, vac 462.5 sec
Thrust, vac 24,750 lbf
Total thrust, vac 99,000 lbf
LH2 dia 8.4 m
LH2 propel 34,334 lbm
Intertank Composite X‐brace
LO2 dia 5.5 m
LO2 propel 200,853 lbm
RCS propel 1,432 lbm
Dry mass 26,133 lb
Total mass 262,752 lb
Fig. 8.
4xRL10
Large
UpperUpper
Stage
concept
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Figure 9. Exploded view
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SLS Large Upper Stage: 4 x RL10 Configuration
Fig 10 (left)
LUS: Propellant Load
Payload is plotted vs LUS usable
propellant in Fig. 10 for the
4xRL10 LUS. TLI Payload is
maximized at 105mt load
(bottom curve). When flown to
LEO rather than TLI, off-loading
to 63mt prop maximizes LEO
payload (top curve). Due to its
higher thrust, LEO payload
maximizes at a higher prop load
for 1xJ2X version LUS.
Fig 11a.
4xRL10
LUS in
Orbit
Figure 11b.
Large Upper
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Large Upper
Stage concept
Elements
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SLS Large Upper Stage: Single J2X Engine Configuration
The single J2X version of the LUS is illustrated in Fig. 12. This LUS also
utilizes a 8.4m dia LH2 tank and a 5.5m dia LO2 tank (Table 4). This
Table 4.
Large Upper Stage‐ 1 x J2Xutilizes a 8.4m dia LH2 tank and a 5.5m dia LO2 tank (Table 4). This
stage is identical to the 4xRL10 version with the exception of the engines,
TVC, feedlines and aft thrust structure. This LUS weighs 264,211 lbm
fully fueled. The thrust of 1xJ2X is 3 times the thrust of 4xRL10s. The
1xJ2X LUS’s thrust advantage allows it to lift more to LEO than the
4xRL10 version. However, due to its lower Isp (448 vs 462 sec), it
delivers less payload to high injection C3 destinations like Europa (7.1 vs
Engines 1 x J2X
Isp, vac 448.0 sec
Total thrust, vac 294,000 lbf
LH2 / LO2 dia 8.4 m / 5.5m
LH2 propel 34,334 lbmdelivers less payload to high injection C3 destinations like Europa (7.1 vs
8.1mt). The J2X engine has a mass of 5,450 lb, by comparison, the RL10
C1 engine weighs 664 lb each, or 2,656 lb for four.
LO2 propel 200,853 lbm
RCS propel 1,432 lbm
Dry mass 27,593 lb
Total mass 264,211 lb
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Figure 12. 1xJ2X Large Upper Stage concept
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SLS Missions:
SLS will play a critical part in enabling the next steps in human space exploration beyond Earth orbit. In the following pages several
representative missions are presented, each launched with the SLS.
Mission to Translunar Space
The SLS will enable the next steps in human space exploration beyond Earth orbit to translunar space. Building a translunar outpost
is an important first step in retrieving an asteroid, returning to the moon or venturing to Mars. NASA’s phased development plan to
evolve lifting capability will allow larger payloads to be launched economically, opening new options for larger vehicles. The SLS
will be ideally suited to deliver a variety of payloads to translunar space. A SLS/LUS could launch multiple translunar elements
simultaneously, reducing the number of overall launches and decreasing the time required to assemble a translunar outpost.
Translunar missions will be undertaken once the SLS and Orion are available
as launch and crew vehicles. Crew operations in translunar space could be
significantly enhanced by providing additional systems and EVA capabilities
beyond those available from Orion only missions. An Exploration Platform
located in translunar space would improve the science and technical return of
the early missions while also increasing Orion capability through resource
provision and providing an abort location and safe haven for vehicle
contingencies. Overall this would increase mission duration, expand mission
utilization option and enhance safety.
Ideally, to increase international participation and share costs, an Exploration
Platform would be created using existing hardware from a number of sources.
Russian systems are well developed and ideal for these new uses, such as
adapting current Russian Science Power Module (SPM) and node designs for
translunar use. Hardware from the Space Shuttle and International Space
Station (ISS) programs, such as the Orbiter Docking System (ODS) and the ISS
Multi-Purpose Logistics Module (MPLM), could be combined with existing
satellite hardware.
Fig. 14 shows the launch of a Russian SPM-derived core module (lower) with
an American ODS-based utility module (upper). Boeing has coordinated with
RSC Energia to study how these elements might be applied in translunar space
for asteroid operations. RSC Energia concluded that a new hybrid module
might be the best option. This module would shorten the pressurized section of
the SPM and add a new node/docking ball section. The utility module is built
around an existing ODS by adding flight-proven Boeing 702 satellite systems
to create an independent, fully functional vehicle. The utility nodule provides
two NASA Docking Standard systems for docking operations with visiting
vehicles.
These two elements together would provide all the key functions required for a
crew base vehicle: EVA capability, internal crew volume, capability to receive
Copyright © 2013 by the Boeing Company. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.
cargo missions, Orion mission extension and future extensibility. Either of the
elements is capable of sustaining the overall vehicle with power and attitude
control. The SPM provides the bulk of the crew habitable volume in the base
vehicle and the utility module provides the important EVA capability.
Fig. 14. SLS/LUS Launch with Russian
SPM and US Utility Module
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SLS Mission: Exploration Platform
Once the SPM-derived core module and utility module are in place, a second SLS / LUS launch would deliver an Orion with crew
and a habitat module, as shown in Fig.15. Following launch and translunar insertion, the Orion would separate, turn 180 degrees and
then dock to the habitat module The upper stage would separate and the Orion would fly the habitat module to the SPM-derivedthen dock to the habitat module. The upper stage would separate and the Orion would fly the habitat module to the SPM derived
core module /utility module already in operation. The habitat module is based on an existing MPLM remaining from the ISS
program. The module would be refurbished to take better advantage of the internal volume than was possible with the ISS
removable rack concept. The berthing mechanism would be replaced with an NDS port and an additional NDS port would be added
at the opposite end. Internally, the habitat would be outfitted with crew living quarters, medical services, exercise equipment, a
galley and payload facilities, as well as additional core systems hardware for redundancy.
As a whole, these three elements—SPM-derived core module, utility
module and habitat—form a very capable Exploration Platform that
would enable and significantly enhance human operation in translunar
space. Initial missions would focus on science, perhaps by studying a
retrieved asteroid. Ongoing research would focus on the deep space
environment, particular the radiation environment and its effect on
humans. Later, the Exploration Platform would serve a base or
jumping-off point for missions to the moon or Mars. The Exploration
Platform would be ideally located to support lunar surface operations,
such as through the remote operation of robotic exploration or
construction vehicles. The Exploration Platform could also be used as
an assembly location for large Mars vehicles and a transfer point for
crew on their way to Mars.
Using the SLS/LUS would allow the Exploration Platform to be
constructed and crewed in only two launches, as opposed to the four
missions required using SLS/iCPS, thus saving cost and significantly
shortening the time required to start accruing the benefits of a crewed
Exploration Platform in translunar space. The SLS family opens up
new possibilities for human space exploration beyond Earth, including
missions to translunar space (Fig. 16) and Mars.
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Fig. 15. SLS/LUS with Orion and Hab Module Fig. 16. Exploration Platform enables future missions
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SLS Mission: Large Crew Habitat EmplacementThe Bigelow BA-2100 is a stand-alone, self-sufficient module for long duration human habitation. It has all the services and
resources (propulsion, power generation, attitude control, etc.) to support a wide variety of missions and purposes. In LEO
for commercial operation, it could serve as an orbital hotel. It could also be the base module for additional expansion, for
instance to add scientific research modules. The BA-2100 is an inflatable module that is deployed after launch to provide
2100 cubic meters of pressurized volume. The module is shown in uninflated in Fig. 17 and 18.
SLS allows delivery of the BA-2100 via direct insertion to a low earth orbit
and is the only launch vehicle capable of delivering a payload this large to
Fig. 17. Habitat and Upper Stage in LEO
and is the only launch vehicle capable of delivering a payload this large to
LEO. SLS provides significant mass margin that can be used for additional
crew consumables or water for radiation protection or additional payloads
The BA-2100 is shown packaged in a 10 m fairing for launch (Fig. 18). After
launch and separation from the first stage, the upper stage would move the
BA-2100 into the desired orbit and separate as well The BA-2100 would thenBA 2100 into the desired orbit and separate as well. The BA 2100 would then
be fully activated to deploy the solar power and thermal arrays and inflate (Fig.
25). Once fully operational, crew visits could commence, such as with the
Boeing CST-100 as shown in Fig. 19.
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Fig. 18. SLS Habitat launch configurationFig. 19. Habitat at destination
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SLS Mission: Uranus Concept
SLS / Large Upper Stage Injection Mass to Uranus (C3=131 km2/2) is 1.7mt.
Mission Objective -
-Deliver a small payload into orbit around Uranus and a shallow probe into the planet’s atmosphere
Mission Rationale -
-Investigate the ice giant system’s atmospheric and magnetic properties, determine the distribution of thermal
emission from the planet’s atmosphere, refine the gravitational harmonics of the planet and conduct close flybys of
any large satellites. Representations of the spacecraft are given in Fig. 20 and 21.
SLS Capabilities -
-SLS mission design shortens travel time, allows for the inclusion of increased mass and removes the need for a
solar electric propulsion stage (SEP) simplifying overall spacecraft and mission design.
Fig. 20. Uranus Mission Spacecraft
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Fig. 21. Uranus Mission Spacecraft
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SLS Mission: Solar Probe 2 Concept
Mission Objective -
-Launch the first spacecraft capable of frequent and close encounters with the sun
Mission Rationale -
-Solar Probe 2 will provide researchers both in-situ measurements and imagery supporting corona heating and solar
wind acceleration investigations. It will also be part of the spacecraft fleet charged to develop the critical
forecasting capability of the space radiation environment in support of human and robotic exploration.
SLS Capabilities -
-SLS mission design incorporates the advantages of both the Solar Probe and Solar Probe Plus spacecraft. It
provides a low perihelion distance (as low as 5 solar radii) and frequent revisit times without the use of
radioisotope thermoelectric generators. Illustrations of the spacecraft are given in Fig. 22 and 23.
Fig. 22. Solar Probe 2 Spacecraft in Route
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Fig 23. Solar Probe 2 Spacecraft
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SLS ATLAST Space Telescope Concept
Mission Objective -
-Characterize Exoplanets and search for signs of life
Best option for extrasolar life-finding facility
Observe ~85 stars 3 times each in a 5-year period
–Probe super massive black holes (SMBH)
Direct measurements of the mass of high redshift SMBH
–Exploration of the Modern Universe
Enable star formation histories to be reconstructed for hundreds of galaxies
Track how and when galaxies assemble their present stars
–Constrain dark matter
Measure the mean density profile of dwarf spheroidal galaxies (dSph), a fundamental constraint on the
nature of dark matter
Mission Rationale -
SLS offers the possibility in a single launch of an 8m Monolithic or a 16m deployable ATLAST
–Telescope deployed at Earth – Sun L2
–Human and/or robotic servicing would be highly desirable extending the life up to 20-30 years
–10 times the resolution of JWST and up to 300 times the sensitivity of the HST
–A monolithic aperture is better than a segmented aperture
-JWST is using a segmented, deployed mirror architecture only because it is the only way to launch a 6.5
meter aperture observatory with a 4.5 meter diameter rocket
-A monolithic mirror can achieve diffraction limited performance at a shorter wavelength than a segmented
mirror with much difficulty, complexity, cost and risk.
SLS Capabilities -
Without the SLS multiple EELV launches and in space assembly are required for the 16m version and no other
launch vehicle is capable of launching an 8m Monolithic telescope
Copyright © 2013 by the Boeing Company. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.
Fig. 24 ATLAST space Telescope concept
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Summary
The SLS provides a critical heavy-lift launch capability enabling diverse deep space missions. The exploration class p y p y g p p p
vehicle launches larger payloads farther in our solar system, faster than ever before possible. This added payload to
destination that can be provided by a new Large Upper Stage would be an enhancement for future science, astronomy
and Human spaceflight missions. The Large Upper Stage can be built at the Michoud Assembly Facility on the same
8.4m tooling as the SLS Core stage and achieve the economic benefits that come with commonality of subsystems,
processes and personnel. The SLS in its evolving configurations will enable a broad range of exploration missions.
SLS SLS
iCPS LUS J2X
Payload mt Payload mt Increase
LEO 70.0 105.2 50 %
Lunar TLI 24.0 38.5 60 %
Mars TMI 20.2 31.6 56 %
Europa 2.9 7.1 144%
Copyright © 2013 by the Boeing Company. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.