Satellite Orbital Elements from the National Space Science Data Center (NSSDC) Satellite Situation Center (SSC), NASA/GSFC

The software and associated database of the Satellite Situation Center
Web (SSCWeb) together form a system to cast geocentric spacecraft
location information into a framework of (empirical) geophysical
regions and mappings of spacecraft locations along lines of the
Earth's magnetic field. This capability is one key to mission science
planning (both single missions and coordinated observations of
multiple spacecraft with ground-based investigations) and to
subsequent multi-mission data analysis. This system directly supports
the operational SSC and ISTP's Science Planning and Operations
Facility (SPOF).

The SSC is a facility operated by NSSDC to fulfill key international
responsibilities such as the SpaceWarn bulletins and to assist users
in a particular magnetospheric region, allow a choice from a variety
of internal and external magnetic field models for field-line tracing
options, plot spacecraft trajectories, and perform conversions among
geocentric and magnetic coordinate systems. magnetic coordinate
systems. The SSC and NSSDC also support a set of pages for
heliospheric spacecraft, planet and comet trajectories and pages for
specific access to various space physics models including IGRF/DGRF
and CGM coordinate transformations. The SSC also maintains a set of
useful processed products and information.

The SSC data products consist of the Locator graphics component which
provides the ability to plot the orbits of multiple spacecraft. In
addition to orbit plots, mapped and time series plots can also be
generated.

An interactive 3-D orbit viewer is also available to provide the user
with the capability to select spacecraft/source and time ranges of
interest, and see their orbits represented as an interactive 3-D
animation.

A Locator Tabular provides tabular information. As tabular output, the
spacecraft's coordinate location can be listed in a variety of
coordinate systems, as well as other location related items

The Query component provides two query matching options:
magnetospheric region occupancy and magnetic field line tracing.

The region query lists the entry and exit times during which specified
satellite(s) were in particular magnetospheric regions. The trace
query identifies periods when one or more spacecraft are on the same
magnetic flux tube of force, or periods when one or more spacecraft
occupy a field line which traces down to a specified ground station.

The Satellite Situation Center (SSC) can be accessed through the
"http://sscweb.gsfc.nasa.gov/"