The two nights of astrometry below, when pasted into FindOrb (Win 64bit version, Jun 22 2017) generates a believable initial orbit.
But if I then toggle the last three positions (for Sept 14) off and press Simplex the program throws up this:
Microsoft Visual C++ Runtime Library
Assertion failed!
Program ...\find_o64.exe
File: classel.cpp
Line: 127
Expression: v2>0.
and gives Abort, Retry and Ignore options. Abort and Retry cause the program to end. Ignore causes various other assertions to be hit.
Presumably there must be some odd issue with this set of positions as it works fine doing the same with other astrometry?
Peter
J95
GSH9EE KC2017 09 12.02887 23 28 46.82 +13 01 55.2 J95
GSH9EE KC2017 09 12.03632 23 28 46.46 +13 01 52.2 J95
GSH9EE KC2017 09 12.04337 23 28 46.14 +13 01 50.7 20.7 G J95
GSH9EE KC2017 09 12.06659 23 28 45.16 +13 01 43.4 20.5 G J95
GSH9EE KC2017 09 14.93638 23 26 38.54 +12 47 52.7 J95
GSH9EE KC2017 09 14.98972 23 26 36.04 +12 47 36.2 J95
GSH9EE KC2017 09 14.99829 23 26 35.76 +12 47 34.5 20.7 G J95