Have a question about using Celestia? Check here first for FAQs and helpful advice.
Forum rules
Please help to make this forum more useful by checking the FAQs before posting! Keep it clean, keep it civil, keep it truthful, stay on topic, be responsible, share your knowledge.
xyz trajectory information for real spacecraft is available from the JPL Horizons ephemeris server. http://ssd.jpl.nasa.gov/?horizons JPL calculates the positions from information provided by the individual research project teams.