There is a pair of satellites which have an unusual flight path. As I first understood it they each fly a helical path, revolving as a pair in a helix around a shared orbit. Stuff I've just read implies that one flies a normal orbit but the other has a helical path around the former. In the right circumstances I can imagine they'd catch the eye.
https://earth.esa.int/eogateway/miss...x-and-tandem-x
Perhaps someone more familiar with interpreting orbits could work out if these could have been in the areas mentioned.
(There may be others operating in the same way, but I heard about these particular ones at the time of their launch).