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  • 1
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    Document Update and Compare (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Document Update and Compare programs provide simple computerized documentmaintenance system on Data General NOVA 840 computer. Document Update program allows user to update document either by batch or terminal input. Documents are modified and lists of modifications printed out.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: MSC-20349 , NASA Tech Briefs (ISSN 0145-319X); 7; 2; P. 227
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Kepler Mission: A Wide-FOV Photometer Designed to Determine the Frequency of Earth-Size and Larger Planets Around Solar-like stars (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The first step in discovering the extent of life in our galaxy is to determine the number of terrestrial planets in the habitable zone (HZ). The Kepler Mission is designed around a 0.95 m aperture Schmidt-type telescope with an array of 42 CCDs designed to continuously monitor the brightness of 100,000 solar-like stars to detect the transits of Earth-size and larger planets. The photometer is scheduled to be launched into heliocentric orbit in 2007. Measurements of the depth and repetition time of transits provide the size of the planet relative to the star and its orbital period. When combined with ground-based spectroscopy of these stars to fix the stellar parameters, the true planet radius and orbit scale, hence the position relative to the HZ are determined. These spectra are also used to discover the relationships between the characteristics of planets and the stars they orbit. In particular, the association of planet size and occurrence frequency with stellar mass and metallicity will be investigated. At the end of the four year mission, hundreds of terrestrial planets should be discovered in and near the HZ of their stars if such planets are common. A null result would imply that terrestrial planets in the HZ occur in less than 1% of the stars and that life might be quite rare. Based on the results of the current doppler-velocity discoveries, detection of a thousand giant planets is expected. Information on their albedos and densities of those giants showing transits will be obtained.
    Keywords: Astrophysics
    Type: SPIE Meeting/Astronomical Telescopes and Instrumentation; Aug 22, 2002 - Aug 28, 2002; Waikoloa, HI; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Kepler Mission: a Discovery-Class Mission Designed to Determine the Frequency of Earth-Size and Larger Planets Around Solar-Like Stars (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The first step in discovering the extent of life in our galaxy is to determine the number of terrestrial planets in the habitable zone (HZ). The Kepler Mission is designed around a 0.95 in aperture Schmidt-type telescope with an array of 42 CCDs designed to continuously monitor the brightness of 100,000 solar-like stars to detect the transits of Earth-size and larger planets. The photometer is scheduled to be launched into heliocentric orbit in 2007. Measurements of the depth and repetition time of transits provide the size of the planet relative to the star and its orbital period. When combined with ground-based spectroscopy of these stars to fix the stellar parameters, the true planet radius and orbit scale, hence the position relative to the HZ are determined. These spectra are also used to discover the relationships between the characteristics of planets and the stars they orbit. In particular, the association of planet size and occurrence frequency with stellar mass and metallicity will be investigated. At the end of the four year mission, hundreds of terrestrial planets should be discovered in and near the HZ of their stars if such planets are common. Extending the mission to six years doubles the expected number of Earth-size planets in the HZ. A null result would imply that terrestrial planets in the HZ occur in less than 1% of the stars and that life might be quite rare. Based on the results of the current Doppler-velocity discoveries, detection of a thousand giant planets is expected. Information on their albedos and densities of those giants showing transits will be obtained.
    Keywords: Astronomy
    Type: Scientific Frontiers in Research on Extrasolar Planets; Jun 18, 2002 - Jun 21, 2002; Washington, DC; United States
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  • 4
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    Back to the Future: Surveying the Northern Hemisphere and Reprocessing the Southern TESS Data Set (2020)
    In:  CASI
    Details
    Publication Date: 2020-01-22
    Description: TESS launched 18 April 2018 to conduct a two-year, near all-sky survey for at least 50 small, nearby exoplanets for which masses can be ascertained and whose atmospheres can be characterized by ground- and space-based follow-on observations. TESS has completed its survey of the southern hemisphere and begun its survey of the northern hemisphere, identifying 〉1000 candidate exoplanets and unveiling a plethora of exciting non-exoplanet astrophysics results, such as asteroseismology, asteroids, and supernova. The TESS Science Processing Operations Center (SPOC) processes the data downlinked every two weeks to generate a range of data products hosted at the Mikulski Archive for Space Telescopes (MAST). For each sector (~1 month) of observations, the SPOC calibrates the image data for both 30-min Full Frame Images (FFIs) and up to 20,000 pre-selected 2-min target star postage stamps. Data products for the 2-min targets include simple aperture photometry and systematic error-corrected flux time series. The SPOC also conducts searches for transiting exoplanets in the 2-min data for each sector and generates Data Validation time series and associated reports for each transit-like feature identified in the search. Multi-sector searches for exoplanets are conducted periodically to discover longer period planets, including those in the James Webb Continuous Viewing Zone (CVZ), which are observed for up to one year. Starting with Sector 8, scattered light from the Earth and Moon contaminated significant portions of the data in each orbit. We have developed algorithms for automated identification of the scattered light features at the individual target level. Previously, data for all stars on a CCD affected by scattered light were manually excluded. The automated flagging will allow us to retain significantly more data for stars that are not affected by the scattered light even though it is occurring elsewhere on the CCD. We also discuss enhancements to the SPOC pipeline and the newly available FFI light curves. The TESS Mission is funded by NASA's Science Mission Directorate as an Astrophysics Explorer Mission.
    Keywords: Astrophysics
    Type: ARC-E-DAA-TN76812 , American Astronomical Society Meeting; Jan 04, 2020 - Jan 08, 2020; Honolulu, HI; United States
    Format: application/pdf
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  • 5
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    Tide gauge observations of the Indian Ocean tsunami, December 26, 2004 (2005)
    In:  Geophys. Res. Lett., Luxembourg, Conseil de l'Europe, vol. 32, no. 9, pp. 245-254, pp. L09603, (ISSN: 1340-4202)
    Details
    Publication Date: 2005
    Keywords: Tsunami(s) ; Earthquake ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; GRL
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    BIBLIOGRAPHY SEISMOLOGY
  • 6
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    Preliminary results from a geophysical study across a modern, continent-continent collisional plate boundary - the Southern Alps, New Zealand (1998)
    In:  Tectonophysics, Warszawa, Army Corps of Engineers, Woodward-Clyde Consultants, vol. 288, no. 1-4, pp. 221-235, pp. 1013, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1998
    Keywords: Plate tectonics ; Deep seismic sounding (espec. cont. crust) ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Seismology ; manetotellurics ; Geoelectrics ; Electromagnetic methods/phenomena ; Seismicity ; Reflection seismics ; Fault zone
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    BIBLIOGRAPHY SEISMOLOGY
  • 7
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    Formation evaluation by inspection with the borehole televiewer (1970)
    In:  Geophysics, Taipei, 3-4, vol. 35, no. 2, pp. 254-269, pp. 1429, (ISSN: 1340-4202)
    Details
    Publication Date: 1970
    Keywords: Borehole Televiewer ; Borehole geophys. ; Layers
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    BIBLIOGRAPHY SEISMOLOGY
  • 8
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    The drift of Saturn's north polar spot observed by the Hubble Space Telescope (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Polar projections of 50 images of Saturn at 889 nanometers and 25 images at 718 nanometers taken by the HST in November 1990, as well as three images at each wavelength taken in June 1991, have been examined. Among them, 31 show the north polar spot, which is associated with Saturn's polar hexagon, in locations suitable for measurement. The movement of the spot with respect to Saturn's system III rotation rate was studied. During the period of observation, the polar spot had first a short-term westward movement and then a long-term eastward drift. The rate of the long-term drift was -0.060 +/- 0.008 deg/day with respect to system III, approximately 50 percent greater than previously determined from Voyager. The original 1980 and 1981 Voyager data were combined with the new Hubble images to form an 11-yr baseline. The eastward drift over the longer period was -0.0569 degrees per day. The long-term drift could be due to uncertainty in the standard value of the internal rotation period. The short-term movement in November 1990 has a rate that is greater in magnitude but opposite in sign and probably represents a real, transient motion of the spot relative to the internal rotation system.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science (ISSN 0036-8075); 260; 5106; p. 326-329.
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    NASA TECHNICAL REPORTS
  • 9
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    HL-20 operations and support requirements for the Personnel Launch System mission (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The processing, mission planning, and support requirements were defined for the HL-20 lifting-body configuration that can serve as a Personnel Launch System. These requirements were based on the assumption of an operating environment that incorporates aircraft and airline support methods and techniques that are applicable to operations. The study covered the complete turnaround process for the HL-20, including landing through launch, and mission operations, but did not address the support requirements of the launch vehicle except for the integrated activities. Support is defined in terms of manpower, staffing levels, facilities, ground support equipment, maintenance/sparing requirements, and turnaround processing time. Support results were drawn from two contracted studies, plus an in-house analysis used to define the maintenance manpower. The results of the contracted studies were used as the basis for a stochastic simulation of the support environment to determine the sufficiency of support and the effect of variance on vehicle processing. Results indicate the levels of support defined for the HL-20 through this process to be sufficient to achieve the desired flight rate of eight flights per year.
    Keywords: SPACE TRANSPORTATION
    Type: Journal of Spacecraft and Rockets (ISSN 0022-4650); 30; 5; p. 597-605.
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Human habitat positioning system for NASA's space flight environmental simulator (1998)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Artificial gravity by centrifugation offers an effective countermeasure to the physiologic deconditioning of chronic exposure to microgravity; however, the system requirements of rotational velocity, radius of rotation, and resultant centrifugal acceleration require thorough investigation to ascertain the ideal human-use centrifuge configuration. NASA's Space Flight Environmental Simulator (SFES), a 16-meter (52-foot) diameter, animal-use centrifuge, was recently modified to accommodate human occupancy. This paper describes the SFES Human Habitat Positioning System, the mechanism that facilitates radius of rotation variability and alignment of the centrifuge occupants with the artificial gravity vector.
    Keywords: Man/System Technology and Life Support
    Type: Fortieth Anniversary: Pioneering the Future; 367-381; NASA/CP-1998-207191
    Format: text
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    NASA TECHNICAL REPORTS
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