JPL Solar System Dynamics
SSD provides information related to the orbits, physical characteristics,
and discovery circumstances for most known natural bodies in our solar system.
Quick Links
Solar System Objects
Count | Classification |
---|---|
8 | Planets |
421 | Planetary Satellites (includes satellites of Earth and dwarf planet Pluto) |
773,916 | numbered |
667,875 | unnumbered |
1,441,791 | Asteroids (includes KBOs, TNOs, and dwarf planets) |
589 | numbered |
3,412 | unnumbered |
4,001 | Comets (includes fragments) |
Statistics
340,633 | orbits computed last month (Feb, 2025) |
---|---|
2,297,812 | orbits computed last 12-months |
Prior Announcements
TLS/SSL Encrypted Connection for Horizons Command-line Interface 2024-09-13
A new TLS/SSL encrypted and PKI authenticating port option is available for the Horizons command-line interface, port 6770.
SSD Server Upgrade Notice 2023-01-25
The SSD server (ssd.jpl.nasa.gov) supporting the website and Horizons will be upgraded starting at 8am PST (16:00 UT), Monday February 13.
Updating to Horizons v4.90 Next Week 2021-09-29
Horizons version 4.90 will go into effect on the server late Monday, October 4 PDT, along with updated documentation. This e-mail is advance notice of new output options, redefinition, and format changes some might need to accomodate.
If you're looking for earlier announcements, all announcements are available on a separate page.