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Space Sci Rev (2018) 214:19 DOI 10.1007/s11214-017-0439-4 OSIRIS-REx Contamination Control Strategy and Implementation J.P. Dworkin1 L.A. Adelman1,2 T. Ajluni1,2 A.V. Andronikov3 J.C. Aponte1,4 A.E. Bartels1 ·E. Beshore5 E.B.· Bierhaus6 J.R.· Brucato7 B.H.· Bryan6 · A.S. Burton8 ·M.P. Callahan· 9 S.L. Castro-Wallace· 8 B.C.· Clark10 S.J. Clemett· 8,11 H.C. Connolly· Jr.12 W.E. Cutlip· 1 S.M. Daly13 V. E .· E l l i o t t 1 J.E. Elsila· 1 · H.L. Enos5 D.F. Everett· 1 I.A. Franchi· 14 D.P.· Glavin1 H.V.· Graham1,15 · J.E. Hendershot· 1,16 J.W. Harris· 6 S.L. Hill· 11,13 A.R. Hildebrand· 17 G.O.· Jayne1,2 R.W. Jenkens Jr.1 K.S.· Johnson6 · J.S. Kirsch11,13· D.S. Lauretta5 A.S.· Lewis1 · J.J. Loiacono1 C.C.· Lorentson1 J.R.· Marshall18 ·M.G. Martin1,4 · · L.L. Matthias13,19· H.L. McLain1,4· S.R. Messenger· 8 R.G. Mink1 ·J.L. Moore6 K. Nakamura-Messenger· 8 J.A. Nuth· III1 C.V. Owens· 13 C.L. Parish· 6 · B.D. Perkins13 M.S. Pryzby· 1,20 C.A. Reigle· 6 K. Righter·8 B. Rizk5 J.F.· Russell6 S.A. Sandford21· J.P. Schepis1 J.· Songer6 M.F.· Sovinski1 ·S.E. Stahl·8,22 · K. Thomas-Keprta· 8,11 J.M. Vellinga· 6 M.S.· Walker1 · · · · Received: 6 April 2017 / Accepted: 27 October 2017 ©SpringerScience+BusinessMediaB.V.,partofSpringerNature2017(outsidetheUSA)2017 Abstract OSIRIS-REx will return pristine samples of carbonaceous asteroid Bennu. This article describes how pristine was defined based on expectations of Bennu and on a re- alistic understanding of what is achievable with a constrained schedule and budget, and OSIRIS-REx Edited by Dante Lauretta and Christopher T. Russell The authors E. Beshore, J.W. Harris, M.G. Martin, J.M. Vellinga are retired. Electronic supplementary material The online version of this article (doi:10.1007/s11214-017-0439-4)containssupplementarymaterial,whichisavailabletoauthorized users. B J.P. Dworkin [email protected] 1 NASA Goddard Space Flight Center, Greenbelt, MD, USA 2 Arctic Slope Research Corporation, Beltsville, MD USA 3 Czech Geological Survey, Prague, Czech Republic 4 Catholic University of America, Washington, DC, USA 5 Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA 6 Lockheed Martin Space Systems, Littleton, CO, USA 7 INAF Astrophysical Observatory of Arcetri, Florence, Italy 8 NASA Johnson Space Center, Houston, TX, USA 19 Page 2 of 53 J.P. Dworkin et al. how that definition flowed to requirements and implementation. To return a pristine sam- ple, the OSIRIS-REx spacecraft sampling hardware was maintained at level 100 A/2 and <180 ng/cm2 of amino acids and hydrazine on the sampler head through precision clean- ing, control of materials, and vigilance. Contamination is further characterized via witness material exposed to the spacecraft assembly and testing environment as well as in space. This characterization provided knowledge of the expected background and will be used in conjunction with archived spacecraft components for comparison with the samples when they are delivered to Earth for analysis. Most of all, the cleanliness of the OSIRIS-REx spacecraft was achieved through communication among scientists, engineers, managers, and technicians. Keywords OSIRIS-REx Bennu Asteroid Sample Return Contamination · · · · Acronyms AAM3 Asteroid Approach Maneuver 3 ACS attitudecontrolsystem ARC NASA Ames Research Center ATLO Assembly,Test,andLaunchOperations ATP adenosine triphosphate CCWG Contamination Control Working Group CDR Critical Design Review CEWG Contamination Engineering Working Group CFD computational fluid dynamics DAC DSMC Analysis Code DART™ DirectAnalysisinRealTime DNA Deoxyribonucleic acid DSMC Direct Simulation Monte Carlo DTGS deuterated glycine trimer EA combustion elemental analyzer EACA ε-amino-n-caproic acid 9 Boise State University, Boise, ID, USA 10 Space Science Institute, Boulder, CO, USA 11 Jacobs Technology, Tullahoma, TN, USA 12 Rowan University, Glassboro, NJ, USA 13 NASA Kennedy Space Center, Titusville, FL, USA 14 The Open University, Milton Keynes, UK 15 University of Maryland, College Park, MD, USA 16 Ball Aerospace, Boulder, CO, USA 17 University of Calgary, Calgary, AB, Canada 18 SETI Institute, Mountain View, CA, USA 19 Analex, Titusville, FL, USA 20 ATA Aerospace, Albuquerque, NM, USA 21 NASA Ames Research Center, Moffett Field, CA, USA 22 JES Tech., Houston, TX, USA OSIRIS-REx Contamination Control Strategy and Implementation Page 3 of 53 19 EDL Earth descent and landing EDU engineering design unit EDX energy dispersive X-ray spectroscopy EMP electron microprobe FTIR Fourier transform infrared spectroscopy GC gas chromatography GC-IRMS GC combustion isotope ratio MS GSFC NASA Goddard Space Flight Center ICP-MS inductively coupled plasma MS IEST Institute of Environmental Sciences and Technology IRMS isotope ratio mass spectrometer ISO International Organization for Standardization JSC NASA Johnson Space Center KSC NASA Kennedy Space Center LA-ICPMS laser ablation inductively coupled plasma MS LC liquid chromatography LM Lockheed Martin Space Systems LPF large payload fairing MAVEN Mars Atmosphere and Volatile EvolutioN Mission MRD mission requirement document MS mass spectrometry NASA National Aeronautics and Space Administration NRC National Research Council NVR nonvolatile residue OCAMS OSIRIS-REx Camera Suite OCSSG Mars Organic Contamination Science Steering Group OLA OSIRIS-REx Laser Altimeter OSIRIS-REx Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer OTES OSIRIS-RExThermalEmissionSpectrometer OTU operationaltaxonomicunit OVIRS OSIRIS-REx Visible and Infrared Spectrometer PDR preliminary design review PFTE polytetrafluoroethylene PHSF KSC Payload Hazardous Servicing Facility PI principal investigator ppb parts per billion ppm parts per million REXIS Regolith X-ray Imaging Spectrometer SEM scanning electron microscopy SRC sample return capsule TAG touch-and-go TAGSAM touch-and-go sample acquisition mechanism TEM transmission electron microscopy ToF-SIMS time-of-flight secondary ion MS UHP ultrahigh purity ULA United Launch Alliance UV ultraviolet VC-HS visibly clean-highly sensitive 19 Page 4 of 53 J.P. Dworkin et al. VIF Atlas V vehicle integration facility XANES X-ray absorption near edge structure µ-L2MS microprobe two-step laser desorption/laser ionization MS 1Introduction The OSIRIS-REx mission (Origins, Spectral Interpretation, Resource Identification, and Se- curity Regolith Explorer) is the third mission selected under NASA’s New Frontiers Pro- gram. The mission was approved for initial competitive development (Phase A) on Decem- ber 29, 2009. The contamination control strategy for OSIRIS-REx evolved from the Organic Contamination Science Steering Group (OCSSG) approach developed for Flagship missions to Mars (Mahaffy et al. 2004)toonetailoredandimplementableinacost-cappedNASApro- gram to a primitive asteroid. This manuscript describes the lessons and results in the seven years of implementation and development through launch on September 8, 2016. The primary objective of the mission is to return and analyze at least 60 g of “pristine” (see below) carbonaceous asteroid regolith (Lauretta et al. 2017). The OSIRIS-REx team selected the B-type near-Earth asteroid (101955) Bennu due to its accessibility and spec- tral similarity to CI and CM carbonaceous chondrites (Clark et al. 2011). Carbonaceous chondrite meteorites are hypothesized to be fragments of carbonaceous asteroids. These are among the oldest and most primitive solids in the solar system, contain up to 3% carbon, and can include parts per million (ppm) or lower abundances of soluble organic compounds. Meteorite studies suggest that these types of asteroids may have contributed a wide range of organic compounds such as amino acids to the Earth, possibly supporting the emergence of life (e.g., Burton et al. 2012). The spacecraft will rendezvous with Bennu in 2018, then spend over a year characterizing the asteroid before executing a touch-and-go (TAG) maneuver to collect a sample of regolith, which will be returned to Earth for worldwide study on Septem- ber 24, 2023. The analysis of pristine asteroid regolith samples from a well-characterized geological context will provide key constraints in the history of asteroid Bennu. This encom- passes the epoch before it was accreted, through when it may have been geologically active and part of a larger body, to its dynamical orbital evolution from the main belt to Earth- crossing. The team will apply what they learn from the history of Bennu through sample analysis to the potential history of other asteroids. The OSIRIS-REx spacecraft will collect surface regolith via a touch-and-go sample ac- quisition mechanism (TAGSAM) that fluidizes loose particles with high-pressure, high- purity N2/He gas (Bierhaus et al. 2017). The N2/He gas carries the samples into a cylindrical sample container, enclosed by biaxially oriented polyethylene terephthalate (e.g., Mylar®) flaps; 5% He is added for leak checking prior to launch. The gas escapes through a metal mesh that serves as the outer wall of the cylinder, and entrained particles, up to 2.5 cm for roughly equidimensional particles, or >2.5 cm in the longest dimension for oblong particles, are trapped. Contact pads of stainless steel loops also collect small particles for investigation of the properties of the space-exposed asteroid surface. The value of these samples could be reduced by the addition of terrestrial contamination, which can directly obscure results and undermine the confidence of measurements and con- clusions. For these reasons, the control of the access of contamination to the sample is key. 1.1 Defining Pristine The driving Mission Level 1 requirement is to “return and analyze a sample of pristine car- bonaceous asteroid regolith in an amount sufficient to study the nature, history, and distribu- tion of its constituent minerals and organic material.” The team designed this Mission Level OSIRIS-REx Contamination Control Strategy and Implementation Page 5 of 53 19 1requirementtocapturetheimportanceofcontaminationbyelevatingittothehighestlevel of mission requirements, with enough flexibility to allow Mission Level 2 and 3 require- ments to focus on the implementation.
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