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  • Lunar and Planetary Science and Exploration  (1,055)
  • Beyond the standard model  (464)
  • 2015-2019  (843)
  • 2005-2009
  • 2000-2004  (676)
  • 2017  (843)
  • 2000  (676)
  • 1
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    Narrowband Rejection of Reaction Wheel and Environmental Disturbances for the WFIRST OMC Testbed (2017)
    In:  Other Sources
    Details
    Publication Date: 2019-12-20
    Description: The Wide Field Infrared Survey Telescope (WFIRST) is a NASA observatory with two scientific instruments. The first is the Wide Field Instrument (WFI) designed to perform wide field imaging and surveys of the near infrared (NIR) sky. The second is a coronagraph (CGI) that will enable astronomers to detect and measure properties of planets in other solar systems. The coronagraph requires 0.5 milli-arcsecond (mas) RMS pointing per axis of the line of sight (LOS) to achieve a contrast of 1x10-9. This paper discusses the approach used for achieving this level of pointing performance on the occulting mask coronagraph (OMC) testbed at JPL. This testbed uses a low-order wavefront sensing (LOWFS) camera and fast steering mirror (FSM) to suppress injected LOS jitter and environmental LOS jitter. The injected jitter includes representative broadband spacecraft attitude control system (ACS) LOS motion and tonal LOS jitter caused by the reaction wheel assemblies (RWA). The environmental jitter includes thermal LOS variations and harmonics of the line noise. The LOWFS camera uses high flux from the obscured science target to achieve high rate measurements of the LOS. These measurements are augmented with fictitious RWA tachometer information and an estimate of the line noise frequency. A LOS servo using a combination of feedback and feedforward control is used in the testbed to compensate for all of the disturbance sources and to mitigate jitter caused by in-band camera noise. The feedforward uses a novel robust least mean squares (RLMS) filter algorithm to reject the RWA and line frequency tones. High fidelity models of the sensors, disturbances and actuator are presented in this paper. These models were developed as part of a simulation of the LOS control system. Performance results from the hardware testbed at the Jet Propulsion Laboratory (JPL) are discussed in this paper.
    Keywords: Lunar and Planetary Science and Exploration
    Type: JPL-CL-CL#17-0637 , Annual Guidance and Control Conference; Feb 02, 2017 - Feb 08, 2017; Breckenridge, CO; United States
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  • 2
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    Neutral Gas Properties of Extremely Isolated Early-Type Galaxies (2017)
    In:  Other Sources
    Details
    Publication Date: 2019-10-22
    Description: We present the results of single-dish atomic hydrogen (H I) observations of six highly isolated early-type galaxies. These objects are a representative subset of galaxies previously studied at optical wavelengths and selected to be separated by at least 2.5Mpc from companions brighter than M(sub V) =16.5 mag. Each galaxy was observed with a single pointing using the NRAO Green Bank Telescope L-band receiver. Five of these systems were strongly detected in H I. These five galaxies exhibit H I profiles with a range of properties: single Gaussian-like peaks, separate double peaks, and double horn-like profiles. The four bluest galaxies (BV〈0.54) all contain significant gas with H I masses ranging from 1.1 10(exp 8) to 1.4 10(exp 9).
    Keywords: Lunar and Planetary Science and Exploration
    Type: ARC-E-DAA-TN56747 , The Astronomical Journal; 153; 4; 158
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  • 3
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    Proving Water Production Out of Mars Analog Soil (2017)
    In:  CASI
    Details
    Publication Date: 2019-09-21
    Description: This project addresses the sustainable aspect of NASA's Evolvable Mars Campaign (EMC), specifically using local resources on Mars to become ad logistically independent of Earth as possible. Water is now a confirmed resource on the surface of Mars in various forms, but in order for it to be utilized it will need to extracted from the martian environment and purified. This project addresses Technology Area (TA) TA07, In-Situ Resource Utilization, specifically water extraction from regolith. The goal of this project was to study a method that could be used to separate water from other contaminating volatiles, This resulted in the development of a dedicated test stand and high fidelity Mars regolith simulant.
    Keywords: Lunar and Planetary Science and Exploration
    Type: JSC-E-DAA-TN51031
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  • 4
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    Lunar COTS Mission Concept: Using the Moon's Resources to Enable an Economical and Sustainable Pathway to Mars and Beyond (2017)
    In:  CASI
    Details
    Publication Date: 2019-09-13
    Description: To support and enable future human missions to the surface of the Moon, a new plan was formulated to gradually develop an economical, evolvable and sustainable lunar infrastructure using a public/private partnerships between NASA and industry to share cost and risk in the development phase and ultimately transfer operation of these infrastructure services to its industry owners. These infrastructure services may include but are not limited to the following: lunar cargo transportation, power stations, energy storage devices, communication towers and relay satellites, and resource extraction operations. The plan is called the Commercial Orbital Transfer Services (COTS) Program, using NASA's well-proven Commercial Orbital Transportation Services (COTS) Program acquisition model.
    Keywords: Lunar and Planetary Science and Exploration
    Type: ARC-E-DAA-TN42684 , Lunar and Planetary Science Conference (LPSC 2017); Mar 20, 2017 - Mar 24, 2017; The Woodlands, TX; United States
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  • 5
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    Global Distribution of On-Set Diameters of Rampart Ejecta Craters on Mars: Their Implication to the History of Martian Water (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A global map is presented of on-set diameters of rampart craters. These craters are proposed to result from impact into wet targets. This map shows both global latitudinal and regional trends that are consistent with the climate and geologic history of Mars.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXI; LPI-Contrib-1000
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  • 6
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    Automation Rover for Extreme Environments (2017)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Almost 2,300 years ago the ancient Greeks built the Antikythera automaton. This purely mechanical computer accurately predicted past and future astronomical events long before electronics existed1. Automata have been credibly used for hundreds of years as computers, art pieces, and clocks. However, in the past several decades automata have become less popular as the capabilities of electronics increased, leaving them an unexplored solution for robotic spacecraft. The Automaton Rover for Extreme Environments (AREE) proposes an exciting paradigm shift from electronics to a fully mechanical system, enabling longitudinal exploration of the most extreme environments within the solar system.
    Keywords: Lunar and Planetary Science and Exploration
    Type: HQ-E-DAA-TN39181
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  • 7
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    Overview of Mars Sample Hazard Analysis (Requirements Workshop Series) (2000)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Samples returned from Mars should be contained and treated as though potentially hazardous until proven otherwise. If sample containment cannot be verified en route to Earth, the sample and spacecraft should either be sterilized in space or not returned to Earth. Integrity of sample containment should be maintained through reentry and transfer to a receiving facility. Controlled distribution of unsterilized materials should only occur if analyses determine the sample not to contain a biological hazard. Planetary protection measures adopted for the first sample return should not be relaxed for subsequent missions without thorough scientific review and concurrence by an appropriate independent body.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Mars Sample Handling Protocol Workshop Series; 87-92; NASA/CP-2000-209624
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  • 8
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    Mars Sample Handling Protocol Workshop Series (2000)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: This document is the report resulting from the first workshop of the series on development of the criteria for a Mars sample handling protocol. Workshop 1 was held in Bethesda, Maryland on March 20-22, 2000. This report serves to document the proceedings of Workshop 1; it summarizes relevant background information, provides an overview of the deliberations to date, and helps frame issues that will need further attention or resolution in upcoming workshops. Specific recommendations are not part of this report.
    Keywords: Lunar and Planetary Science and Exploration
    Type: NASA/CP-2000-209624 , A-00V0035 , NAS 1.55:209624 , Mar 20, 2000 - Mar 22, 2000; Bethesda, MD; United States
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  • 9
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    New Strategy for Exploration Technology Development: The Human Exploration and Development of Space (HEDS) Exploration/Commercialization Technology Initiative (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: In FY 2001, NASA will undertake a new research and technology program supporting the goals of human exploration: the Human Exploration and Development of Space (HEDS) Exploration/Commercialization Technology Initiative (HTCI). The HTCI represents a new strategic approach to exploration technology, in which an emphasis will be placed on identifying and developing technologies for systems and infrastructures that may be common among exploration and commercial development of space objectives. A family of preliminary strategic research and technology (R&T) road maps have been formulated that address "technology for human exploration and development of space (THREADS). These road maps frame and bound the likely content of the HTCL Notional technology themes for the initiative include: (1) space resources development, (2) space utilities and power, (3) habitation and bioastronautics, (4) space assembly, inspection and maintenance, (5) exploration and expeditions, and (6) space transportation. This paper will summarize the results of the THREADS road mapping process and describe the current status and content of the HTCI within that framework. The paper will highlight the space resources development theme within the Initiative and will summarize plans for the coming year.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Space Resources Roundtable II; 31; LPI-Contrib-1070
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  • 10
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    New Evidence that the Valles Marineris Interior Layered Deposits Formed in Standing Bodies of Water (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Our results indicate that the best explanation for the origin and current morphology of the Valles Marineris interior layered deposits is by deposition of sediments, including chemical precipitates, in standing bodies of water.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXI; LPI-Contrib-1000
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