Overview of tools for asteroid observers on this site
Updated 2020 May 06
Special note about interstellar objects such as C/2019 Q4 = 2I/Borisov and A/2017 U1 = 1I = ʻOumuamua
Use the form below to get orbital elements and ephemerides from astrometric observations.
Suggested quick start: Don't panic! Copy/paste your observations in the large text window below, and/or click on "Browse" to pick a file containing the astrometry, and/or enter an object name.
Click here if you're wondering how to get your observations into the correct format.
Feed it all of your observations. There is almost never any benefit in giving the program a subset.
Then click the "compute orbit and ephemerides" button. Usually, that'll be all you need to do. If it isn't, hit the back arrow and look a little more closely at your options (options documented here.) If you're still not getting things to work, contact me.
Click here if you just want orbital elements and/or ephemerides for an object, and don't have astrometry for it.
Here are a few hints that may be useful.
Note that the orbit will be computed from all observations, from all three possible sources (cut/pasted, uploaded, or from MPC data), whether their designations match or not. So you can mix-and-match the three input sources, if you have (for example) some new observations of an object already known to MPC.
This is a modified, simplified, non-interactive version of the Find_Orb program.
There are several other tools for asteroid observers on this site.