A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Position-Finding
From: Peter Monta
Date: 2018 May 11, 23:16 -0700
I converted your positions to the format expected by the Minor Planet Center, and fed it through under the assumption that your observations were made at the MPC code (Q62). The cross-track errors were in the two to four arcsecond range; along-track (the timing error), -0.024 milliseconds to +0.101 seconds.
I could easily believe that these errors were due to the MPC's position for your observatory being off (or my assumption as to the observatory being (Q62) being wrong). At 20000 km, those cross-track errors would correspond to a few hundred meters.