SSCWeb Home An official website of the United States government Here's how you know Here's how you know Official websites use .gov A .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites. Menu Goddard SPDF SSCWeb SSCWeb Home Quick Start Guide User Guide and Tutorial Spacecraft Availability & Time Range Data Provenance Usage Statistics Feedback Spacecraft Locator 2-D Locator Graphics 4-D Orbit Viewer Locator Listing Conjunction Query Software and Tools SSC Web Services SSC Coordinate Calculator IGRF/DGRF and CGM Coordinate Conversion WebGeocalc from JPL NAIF Other Heliospheric Spacecraft, Planet, and Comet Trajectories JPL Horizons Solar System Ephemeris SSC Products and Information Cluster Ephemeris Changes Search Satellite Situation Center System and Services The Satellite Situation Center Web (SSCWeb) Service is operated by NASA's Space Physics Data Facility (SPDF). It was developed jointly by SPDF and the National Space Science Data Center (NSSDC) to support a range of NASA science programs and to fulfill key international NASA responsibilities including those of NSSDC and the World Data Center-A for Rockets and Satellites. The software and associated database of 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. SPDF News & Announcements Please expect all SPDF services (CDAWeb, SSCWeb, OMNIWeb, etc.) to be unavailable on Wednesday of the first full workweek of each month for system maintenance. Try out our browser-based 4D Orbit Viewer to display the SSC spacecraft orbits in an interactive 3-D animation tool (short demo). Please let us know of any questions, suggestions, and comments.** **To reach SPDF support services staff please use our new email address: [email protected] (for help with CDAWeb, SSCWeb, SPDF Web Services and OMNIWeb). To reach CDF support staff please use our new email address: [email protected]. SSC Quick Start Guide SSC User Guide and Tutorial SSC Database Contents Spacecraft Availability & Time Ranges Data Provenance 4-D Orbit Viewer 4D Orbit Viewer provides an interactive 4-D animation of spacecraft orbits over time. Locator Listing Locator provides a table of spacecraft coordinate locations in various coordinate systems with other location-related information.(THEMIS Saved Examples) 2-D Locator Graphics Locator Graphics generates 2-D plots of the locations of multiple spacecraft as orbit, mapped and time series plots.(THEMIS Saved Examples). Conjunction Query 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.(THEMIS Saved Examples) Coordinate Converter Convert between coordinate systems and trace a point along the corresponding magnetic field line. Contact SPDF: NASA-SPDF Feedback/Support Responsible NASA Official: Robert M. Candey Site Editor: Tami Kovalick SPDF ROR ID SPDF re3data ID Acronyms About NASA Accessibility FOIA No FEAR Act Privacy Policy Vulnerability Disclosure Policy Last Updated: Aug 5, 2026