I think I read this c. 1987. It would've been in a paperback SF short fiction anthology, likely with other stories by more famous authors (Heinlein, Asimov, the usual suspects). As I recall, the name of this story's author was not familiar to my young self at the time. The anthology was probably not a best-of for a particular year; I believe it was more of a thematic all-time deal.
The story's very simple. (Spoiler alert; it's hard to summarize this one without spoilers.) It narrates the perceptions and experiences of the probe as it ventures farther from its point of origin (Earth, I assume). Nothing really happens; planets and galaxies and their ilk drift by. As the endless journey unfolds, other probes from other civilized planets end up in the same trajectory as our hero. One by one, they accumulate; the story ends with a convoy of them probing onward into an unknowable (but achingly lonely, to my young reading self) future...
My Google skills have not been adequate to this. I did read "Interstellar Probes in Science Fiction" on the Icarus Interstellar site, to no avail; the story I'm looking for is not Van Vogt's "Far Centaurus."
My reason for wanting to know is admittedly personal and maybe not of universal interest: the story blew me away and devastated me as a young SF reader. (Yet somehow I forgot title and author!) Judging by other things I loved at the time, it'd probably underwhelm me today, but I'd love to unearth it and give it a fighting chance.
This is my first time on this awesome site (I explored a bit before posting). Apologies if my question's askew or ignorant or somehow violates protocol. Thanks for taking a look!