User guide

Trajectory Browser User Guide Please refer to this section for a description of the main characteristics and limitations of this web application.

The Trajectory Browser is a search engine that allows a user to find impulsive trajectories to planetary bodies meeting specific constraints.

A Lambert solver determines heliocentric transfer orbits without taking into account gravity due to planetary bodies, solar radiation pressure and other perturbations.

The Trajectory Browser currently holds solutions for transfers from Earth to all planets and known Near-Earth Objects (routinely updated with latest discoveries).

If there is a body or class of bodies not found on the Trajectory Browser but useful to your mission, please contact us with your suggestions.

The number of displayed trajectories for a particular search is limited to a maximum of a hundred. Data recovery equipment Therefore, the users are required to tailor their searches to satisfy their needs. Database primary key If ,for instance, a user wants to find trajectories to Venus and the entry settings are set in a way that the number of trajectories available exceeds the limit, only a hundred results would be displayed. Database link oracle The particular cases that are shown depends on the search. 7 data recovery key For example, a particular search may return trajectories sorted by time of flight from maximum to minimum. Database manager salary If the displayed trajectories reach the limit of a hundred, there may be solutions with shorter time of flights available. Database processing In this case, to find out, the search should be redefined to limit the duration to a certain maximum number that meets the user’s mission requirements.

To search for trajectories from a specific subset of included bodies, check the ‘Custom list’ checkbox and enter a list of objects in the subsequent field of the Trajectory Browser search page.

For example, to search for trajectories to the asteroid Apophis, one may enter its SPK-ID ‘2099942’, its asteroid number ‘99942’ or simply its name ‘Apophis’.

For example, one may use this tool to select all S-class NEOs by selecting the proper constraints and outputting SPK-IDs into a spreadsheet-usable CSV file.

Orbit condition codes are particularly important when computing spacecraft transfer trajectories several years or more after the latest observation,

Small-bodies with higher orbit condition codes imply inherently greater uncertainty in the existence and ΔV-values associated with trajectories to those bodies.

These constraints are meant to be high enough to cover realistic mission designs but not too high to maintain the trajectory database at a practical size.

However for human spaceflight endeavors and some robotic missions, a mission designer will want to lower the mission duration at the cost of extra ΔV.

there are many more trades that are not available in the Trajectory Browser and are outside the scope of its use as a preliminary trajectory survey.

A user cannot specify constraints on DLA or reentry speed since the trajectories in the database were selected only for a ΔV vs. Database xcode mission duration trade,

General Mission Analysis Tool (GMAT) is space trajectory optimization and mission analysis system developed by NASA and private industry in the spirit of the NASA Vision.

Foster, C., Daniels, M., Mission Opportunities for Human Exploration of Nearby Planetary Bodies, AIAA SPACE 2010, Anaheim, CA, AIAA 2010-8609