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Results for “ORBITAL CALCULATION”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Error bounds of continuous Kalman filters and the application to orbit determination problems.
Error effect in continuous Kalman filters used in orbit determination problems, deriving error bounds formula
ORBIT CALCULATION↗
Surveyor spacecraft landing accuracy.
Conventional guidance-problem parameters and basic parameters applicable to Surveyor in relation to accuracy of lunar landing
ORBIT CALCULATION↗
Orbit determination for Lunar Orbiter.
Orbit determination for Lunar Orbiter, describing computer program and studying Doppler residuals
LUNAR ORBITER↗
A computer simulation of the orbital launch window problem.
Digital computer simulation of orbital launch window problem for departure-trajectory analyses
LAUNCH WINDOW↗
On the application of electric propulsion to satellite orbit adjustment and station keeping.
Satellite orbit adjustment, stationkeeping and attitude control of typical earth- and sun- synchronous satellites by electric propulsion systems
SATELLITE ATTITUDE CONTROL↗
Improvement of the spheroidal method for artificial satellites
Spheroidal method for calculating polar orbits of artificial satellites
Vinti, J. P.↗
Some problems of astrodynamics
Astrodynamic problems on satellite orbit design calculations
Duboshin, G. N.↗
Protonospheric electron concentration profiles
Electron density profiles along OGO 1 orbit portions calculated by measuring harmonic radio beacon transmissions differential Doppler frequencies and Faraday polarization rotation angle
Da Rosa, A. V.↗
Choice of integrators for use with a variation of parameters formulation
Perturbation theory using variation of parameters formulation to calculate satellite orbits
Rinderle, E. A.↗
A computer program to determine geometric parameters for the AFM solar arrays
A computer program has been written to aid in the design of the A. E. M.-1 solar array and to determine the power that will finally be available from the array. The program will plot the array output as a function of the satellite's position in a given orbit and will calculate the average output over the orbit.
Gaddy, E. M.↗
Optical measurement of interplanetary particulates from Pioneer 10
The spatial concentration and size distribution for particulates measured in situ by the asteroid/meteoroid detector on Pioneer 10 between 1.0 and 3.5 AU are presented. The size distribution includes particles of radii from about 35 microns to 10 cm. Extrapolation from the smallest particle sizes measured shows good agreement with the results of the particle penetration detector carried on the same spacecraft. Within the uncertainties of this experiment, a single size distribution seems appropriate for all but the smallest particles measured. There is evidence for the existence of a planetary sweeping effect in the vicinity of the Mars orbit. As calculated from the particle spatial distribution, the zodiacal light brightness is found to vary approximately as the inverse square of solar distance out to about 2.25 AU and then decrease more rapidly. The absolute value of the zodiacal light brightness as calculated from the particle spatial concentration is found to be too high by a factor of 10.
Soberman, R. K.↗
Station coordinates in the standard earth 3 system and radiation-pressure perturbations from ISAGEX camera data
Simultaneous and individual camera observations of GEOS 1, GEOS 2, Pageos, and Midas 4 obtained during the International Satellite Geodesy Experiment are utilized to determine station coordinates. The Smithsonian Astrophysical Observatory Standard Earth III system of coordinates is used to tie the geometrical network to a geocentric system and as a reference for calculating satellite orbits. A solution for coordinates combining geometrical and dynamical methods is obtained, and a comparison between the solutions and terrestrial data is made. The radiation-pressure and earth-albedo perturbations for Pageos are very large, and Pageos' orbits are used to evaluate the analytical treatment of these perturbations. Residual effects, which are probably of interest to aeronomists, remain in the Pageos orbits.
Gaposchkin, E. M.↗
Some recent investigations in numerical averaging
The feasibility of using computer programs for numerical averaging in high drag orbit prediction calculations is considered.
Wexler, D.↗
Station coordinates in the Standard Earth III system derived by using camera data from ISAGEX
Simultaneous and individual camera observations of Geos 1, Geos 2, Pageos, and Midas 4 obtained during the International Satellite Geodesy Experiment are used to determine station coordinates. The Smithsonian Astrophysical Observatory Standard Earth III system of coordinates is utilized to tie the geometrical network to a geocentric system and as a reference for calculating satellite orbits. The normal systems for geometrical and dynamical solutions are combined.
Gaposchkin, E. M.↗
Static and dynamic stability analysis of the space shuttle vehicle-orbiter
The longitudinal static and dynamic stability of a Space Shuttle Vehicle-Orbiter (SSV Orbiter) model is analyzed using the FLEXSTAB computer program. Nonlinear effects are accounted for by application of a correction technique in the FLEXSTAB system; the technique incorporates experimental force and pressure data into the linear aerodynamic theory. A flexible Orbiter model is treated in the static stability analysis for the flight conditions of Mach number 0.9 for rectilinear flight (1 g) and for a pull-up maneuver (2.5 g) at an altitude of 15.24 km. Static stability parameters and structural deformations of the Orbiter are calculated at trim conditions for the dynamic stability analysis, and the characteristics of damping in pitch are investigated for a Mach number range of 0.3 to 1.2. The calculated results for both the static and dynamic stabilities are compared with the available experimental data.
Chyu, W. J.↗
Collisional and dynamical processes in moon and planet formation
The collisional and dynamical processes in moon and planet formation are discussed. A hydrodynamic code of collision calculations, the orbital element changes due to gravitational scattering, a validation of the mass shifting algorithm, a theory of rotations, and the origin of asteroids are studied. A numerical model of planet growth is discussed and a methodology to evaluate the rate at which megaregolith increases its depth as a function of total accumulate number of impacts on an initially smooth, coherent surface is described.
Source record↗
The natural history of Halley's comet
The 1986 apparition of Halley's comet will be the subject of numerous space probes, planned to determine the chemical nature and physical structure of comet nuclei, atmospheres, and ionospheres, as well as comet tails. The problems of cometary origin remain inconclusive, with theories ranging from a purely interstellar origin to their being ejecta from the Galilean satellites of Jupiter. Comets can be grouped into one of two classes, depending on their periodicity, and statistical mechanics of the entire Jovian family of comets can be examined under the equilibrium hypothesis. Comet anatomy estimations have been determined, and there is speculation that comet chemistry may have been a factor in the origin of life on earth. Halley's comet was first noted using Newton's dynamical methods, and Brady (1972) attempted to use the comet as a gravitational probe in search of a trans-Plutonian planet. Halley's orbit is calculated by combination of ancient observations and modern scientific methods.
Mclaughlin, W. I.↗