Has any anons considered that this may be "The Gathering" from Robert Monroe's second book "Far Journeys"? It goes much deeper than that, but essentially at the Monroe institute (TMI) they figured out a technique to revisit the gathering a few different times.
One of the individuals there at TMI at the time was a guy named bruce moen. He wrote about this in his book, "voyages into the unknown."
It's in three parts you can read here. In this excerpt Bruce covers the section of Far Journeys where Monroe tells about The Gathering.
https://www.afterlife-knowledge.com/gatherng.html
In Bruce's experience he discovers that The Gathering will be triggered by a comet. It is absolutely a MAJOR event. In Roberts book The Gathering consist of beings from all over the universe that come to observe an event that occurs on earth from the comet that does something to the energy or something to that effect that changes everything. Many people disappear and many other people stay in "Focus 27" for a long time. It's quite interesting if any anons want to go down this rabbit hole.
Years ago Bruce did claim that the comet that triggers The Gathering occurred I think in the late 90's. Personally I think he was incorrect about which comet would triggers the event.
Anons, I feel like this may not necessarily be an artificial object, but that does not mean that it is being used for other purposes.
I'm eagerly waiting in anticipation for 3I/ATLAS to arrive.