Author: James F. DuganPublisher:
ISBN:
Category : Mars probes
Languages : en
Pages : 78
Book Description
Analysis of Trajectory Parameters for Probe and Round-trip Missions to Mars
Author: James F. DuganPublisher:
ISBN:
Category : Mars probes
Languages : en
Pages : 72
Book Description
Analysis of Trajectory Parameters for Probe and Round-trip Missions to Venus
Author: James F. DuganPublisher:
ISBN:
Category : Planets
Languages : en
Pages : 54
Book Description
For one-way transfers between Earth and Venus, charts are obtained that show velocity, time, and angle parameters as functions of the eccentricity and semilatus rectum of the Sun-focused vehicle conic. From these curves, others are obtained that are useful in planning one-way and round-trip missions to Venus. The analysis is characterized by circular coplanar planetary orbits, successive two-body approximations, impulsive velocity changes, and circular parking orbits at 1.1 planet radii. For round trips the mission time considered ranges from 65 to 788 days, while wait time spent in the parking orbit at Venus ranges from 0 to 467 days. Individual velocity increments, one-way travel times, and departure dates are presented for round trips requiring the minimum total velocity increment. For both single-pass and orbiting Venusian probes, the time span available for launch becomes appreciable with only a small increase in velocity-increment capability above the minimum requirement. Velocity-increment increases are much more effective in reducing travel time for single-pass probes than they are for orbiting probes. Round trips composed of a direct route along an ellipse tangent to Earth's orbit and an aphelion route result in the minimum total velocity increment for wait times less than 100 days and mission times ranging from 145 to 612 days. Minimum-total-velocity-increment trips may be taken along perihelion-perihelion routes for wait times ranging from 300 to 467 days. These wait times occur during missions lasting from 640 to 759 days.
Three-dimensional Trajectory Analysis for Round-trip Missions to Mars
Author: Gerald KnipPublisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 168
Book Description
Three-dimensional Trajectory Analysis for Round-trip Missions to Venus
Author: Charles L. ZolaPublisher:
ISBN:
Category : Space flight to Venus
Languages : en
Pages : 112
Book Description
Three-dimensional Trajectory Analysis for Round-trip Mission to Mars
Author: Gerald KnipNASA Technical Note
Author: Three-dimensional Trajectory Analysis for Round-trip Missions to Mars
Author: Gerald KnipPublisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 163
Book Description
NASA Technical Report
Author: Index of NASA Technical Publications
Author: United States. National Aeronautics and Space AdministrationPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 500
Book Description
Author: