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Organism/Organic Exposure to Orbital Stresses (OOREOS) Satellite: Radiation Exposure in LEO and Supporting Laboratory StudiesWe will present the results from the exposure of the metalloporphyrin iron tetraphenylporphyrin chloride (FeTPPCI), anthraufin (C(sub 14)H(sub 8)(O sub 4) (Anth) and Isoviolanthrene (C(sub 34H sub 18) (IVA) to the outher space environment, measured in situ aboard the Organism/Organic Exposure to Orbital Stresses nanosatellite. The compounds were exposed for a period of 17 months (3700 hours of direct solar exposure) including broad-spectrum solar radiation (approx. 122 nm to the near infrared). The organic films are enclosed in hermetically sealed sample cells that contain one of four astrobiologically relevant microenvironments. Transmission spectra (200-1000 nm) were recorded for each film, at first daily and subsequently every 15 days, along with a solar spectrum and the dark response of the detector array. In addition to analysis via UV-Vis spectroscopy, the laboratory controls were also monitored via infrared and far-UV spectroscopy. The results presented will include the finding that the FeTPPCI and IVA organic films in contact with a humid headspace gas (0.8-2.3%) exhibit faster degradation times, upon irradiation, in comparison with identical films under dry headspaces gases, whereas the Anth thin film exhibited a higher degree of photostability. In the companion laboratory experiments, simulated solar exposure of FeTPI films in contact with either Ar or CO(sub -2):O(sub -2):Ar (10:0.01:1000) headspace gas results in growth of a band in the films infrared spectra at 1961 cm(sup 1). Our assignment of this new spectral feature and the corresponding rational will be presented. The relevance of O/OREOS findings to planetary science, biomarker research, and the photostability of organic materials in astrobiologically relevant environments will also be discussed.
Document ID
20140006934
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Mattioda, Andrew Lige (NASA Ames Research Center Moffett Field, CA United States)
Cook, Amanda Marie (ASRC Research and Technology Solutions, LLC Moffett Field, CA, United States)
Quinn, Richard C. (Search for Extraterrestrial Intelligence Inst. Mountain View, CA, United States)
Elsaesser, Andreas (Leiden Univ. Netherlands)
Ehrenfreund, Pascale (Space Policy Inst. Washington, DC, United States)
Ricca,Alessandra (Search for Extraterrestrial Intelligence Inst. Mountain View, CA, United States)
Jones, Nykola C. (Aarhus Univ. Denmark)
Hoffman, Soren (Aarhus Univ. Denmark)
Ricco,Antonio (NASA Ames Research Center Moffett Field, CA United States)
Date Acquired
June 9, 2014
Publication Date
March 16, 2014
Subject Category
Astrophysics
Report/Patent Number
ARC-E-DAA-TN11901
Funding Number(s)
WBS: WBS 811073.02.11.02.08
CONTRACT_GRANT: NNA12AA24C
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Radiation Exposure
LEO
OOREOS

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