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  • SPACE SCIENCES  (146)
  • 2015-2019
  • 1970-1974  (146)
  • 1
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    Interplanetary orbit determination (1973)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The logistical aspects of orbit determination (OD) in the interplanetary phase of the Mariner Mars 1971 mission are described and the working arrangements for the OD personnel, both within the Navigation Team and with outside groups are given. Various types of data used in the OD process are presented along with sources of the data. Functional descriptions of the individual elements of the OD software and brief sketches of their modes of operation are provided.
    Keywords: SPACE SCIENCES
    Type: Its Mariner 9 Navigation; p 20-118
    Format: text
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  • 2
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    Simultaneous solution for the masses of the principal planets from analysis of optical, radar, and radio tracking data. (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The Jet Propulsion Laboratory has developed a set of computer programs known as the Solar System Data Processing System (SSDPS) which is employed in improving the ephemerides of the major planets and for improving the values of several associated astronomical constants. A group of solutions for the masses of the major planets, together with the AU and radii of Mercury, Venus, and Mars, is presented. These solutions based upon optical, radar, and spacecraft radio tracking data are preliminary. The relative power of radar and radio tracking data vis-a-vis purely optical data in a solution is shown. The problems which could arise by adopting solutions based upon a single data type are demonstrated.
    Keywords: SPACE SCIENCES
    Format: text
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  • 3
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    Effects of physical librations of the moon on the orbital elements of a lunar satellite. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Physical librations of the moon are small cyclic perturbations with periods of one month and longer, and amplitudes of 100 arc seconds or less. This paper gives data on the magnitude of the physical librations, the geometrical effects on the orbital elements, and the equivalent changes in the coefficients in the gravitational potential. It is shown that geometrical effects can be accommodated either by using an inertial axes system or by compensating for the lunar librations and precession when the selenographic axes are used. Further, it is shown that physical effects are small and negligible for all but the most exacting endeavors.
    Keywords: SPACE SCIENCES
    Type: Celestial Mechanics; 8; Aug. 197
    Format: text
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  • 4
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    Creep response of the lunar crust in mare regions from an analysis of crater deformation (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The settling trends of 318 lunar mare craters are compared with predictions of numerical finite-element models in order to determine the creep response of the upper lunar mare crust. No settling is evident in craters smaller than 5 km in diameter. Settling rates of larger craters increase as function of crater size in a manner suggesting a nonlinear lunar creep response corresponding to the power law epsilon = 8.3 x 10 to the minus 34th sigma squared where epsilon is the strain rate and sigma is the differential stress. However, the observed nonlinearity is probably an apparent nonlinearity resulting from the temperature-induced viscosity decrease with depth due to a lunar crustal temperature gradient of 3 C/km and a creep activation energy of 20 kcal/mole. It is concluded that creep in the lunar medium is essentially Newtonian, and that the effective viscosity of the upper lunar mare is (1.6 plus or minus 0.3) x 10 to the 25th poise.
    Keywords: SPACE SCIENCES
    Type: Physics of the Earth and Planetary Interiors; 8; 4, Ju; June 197
    Format: text
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  • 5
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    The lunar rocks (1970)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: Book on lunar rocks covering pre-Apollo lunar scientific knowledge, Apollo and future lunar mission planning, lunar mineralogy, petrology and geochemistry, etc
    Keywords: SPACE SCIENCES
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  • 6
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    Photometric and polarimetric properties of the Bruderheim chondritic meteorite. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Study of the spectral, photometric, and polarimetric properties of the Bruderheim olivine-hypersthene chondritic meteorite. This meteorite is representative of the most common meteoritic material recovered on earth, and, hence, could also be the most common in interplanetary space. Yet, comparison with astronomical data indicates that none of the asteroids in the main belt for which adequate observations exist can be matched with Bruderheim properties. Only the surface of the Apollo asteroid Icarus does, in light of polarization and photometry data, appear to be consistent with an ordinary chondrite composition. This suggests the possibility that this material, although common in earth-crossing orbits, is rare as a surface constituent in the main asteroid belt.
    Keywords: SPACE SCIENCES
    Type: Icarus; 19; July 197
    Format: text
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  • 7
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    Apollo 12 mission report. Supplement 4: Ascent propulsion system final flight evaluation (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The results of the postflight analysis of the ascent propulsion system (APS) performance during the Apollo 12 Mission are presented. The steady-state performance analysis, and pressurization system are discussed along with the propellant loading and usage, APS overburn, and burn time. It is concluded that APS flight performance reconstructions for LM-3, LM-4, LM-5, and LM-6 indicate that engine performance prediction techniques are conservative.
    Keywords: SPACE SCIENCES
    Type: NASA-TM-X-69529 , TRW-17618-H001-R0-00-SUPPL-4 , MSC-01855-SUPPL-4
    Format: application/pdf
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  • 8
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    Special report, diffuse reflectivity of the lunar surface (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The far ultraviolet diffuse reflectivity of samples of lunar dust material is determined. Equipment for measuring the diffuse reflectivity of materials (e.g. paint samples) is already in existence and requires only minor modification for the proposed experiment which will include the measurement of the polarizing properties of the lunar samples. Measurements can be made as a function of both illumination angle and angle of observation.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-128546 , T72-19298
    Format: application/pdf
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  • 9
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    Preliminary data on boulders at station 6, Apollo 17 landing site (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A cluster of boulders at Station 6 (Apollo 17 landing site) consists of breccias derived from the North Massif. Three preliminary lithologic units were established, on the basis of photogeologic interpretations; all lithologies identified photogeologically were sampled. Breccia clasts and matrices studied petrographically and chemically fall into two groups by modal mineralogy: (1) low-K Fra Mauro or high basalt composition, consisting of 50-60% modal feldspar, approximately 45% orthopyroxene and 1-7% Fe-Ti oxide; (2) clasts consisting of highland basalt composition, consisting of 70% feldspar, 30% orthopyroxene and olivine and a trace of Fe-Ti oxide.
    Keywords: SPACE SCIENCES
    Type: NASA-TM-X-58116 , JSC-08484
    Format: application/pdf
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  • 10
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    Martian surface coordinates. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: This paper presents methods and results for primary and secondary triangulation of the Martian surface. The primary network is based on multiphotograph stereophotogrammetry in which the pictures are rotated around fixed centers; these centers are provided as spacecraft stations from the tracking data. The computations use the latest Mars spin axis determined by Mariner 9 experiments and the new first meridian passing through a small crater, Airy-0, seen on Mariner 9 imagery. The secondary triangulation is performed in the map plane using rectified pictures as map fragments, assumed to be of correct shape. In this paper, 1205 primary positions are given.
    Keywords: SPACE SCIENCES
    Type: Journal of Geophysical Research; 78; July 10
    Format: text
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