GURPS Space - assistance

[Fred Brackin]

You have not yet mentioned any accretion disk around your black hole and that is almost certainly its' most important characteristic in this scenario. You need for there to be virtually no disk to limit hard radiation to acceptable lavels.

You also need for these two bodies to have formed at realtively distant places in space and tiime. Co-evolution is not really an option. There was a large supernova (and maybe even a hypernova/gamma ray buster) at that black hole's location just slightly before its' formation. It may have eaten a star or two afterward as well.

All very interesting as long as it takes place at a safe distance but a safe distance is probably rather more than 600 AU.

The capture of Astra's solar system by Thantos needs to have happened well after planetary formation and never brought Astra's planets too close to Thanatos. Otherwise you get accretion disk and radiation problems and might well have problems with a highly elliptical orbit long afterwards.

I suspect that there is some gentle long range capture scenario that meets your needs but it will be another low probabitliy occurence.

The good news is that the requirements for post-planetery capture does away will all considerations about how Thanatos would have affected Astra's developing solar system. There was no effect at all because it wasn't there at the time.

If Thanatos and Astra had started forming around the same time at a distance of 600 AU, Thanatos would have gone boom before Astra really got started and the supernova would have blown away too much of the gas and dust Astra needed to make a solar system.

Recent (in astronomical terms) supernovas of the correct type that we know of tend to have largish accretion disks and intense radiation too. Mnay of them even form pulsars. You really don't want to be 600 aU from a pulsar.

Thanatos has had a violent past and that all needs to have taken place more thaa 600 AU from Astra. Probably quite a long time in the past as well. Even now Thantos would be doing nasty things to Astra's Oort Cloud.