Evolution of the barycentric distance of 1I/2017 U1 (‘Oumuamua), C/1987 W3 (Jensen–Shoemaker), C/1997 BA6 (Spacewatch), C/2000 SV74 (LINEAR), C/2007 M2 (Catalina), C/2018 F4 (PANSTARRS) – all nominal orbits –, and a few representative control orbits of C/2018 F4 (in blue) based on the current orbit determination (top panel). The zero instant of time, epoch JDTDB 2458600.5, 27-April-2019, and only the time interval (−100 000, 100 000) yr are displayed. Values of the barycentric distance as a function of the velocity parameter 1 Myr into the past (left-hand side bottom panel) and 1 Myr into the future (right-hand side bottom panel) for 1024 control orbits of C/2018 F4.