Hi all, I'm in need of a plausible detail for some of my fiction I write. I have a rogue planet with a set of orbital parameters as follows, looping around Sol:
So, the assumed SMA would be -22.5, with a Perihelion date of January 12, 2020.
Rogue Planet has two moons, with an external barycenter with the outer one, all with the following parameters:
Radius 5469.6462 km
Mass 0.60543 M_earth
Radius 1326.212 km
Mass 0.005454 M_Earth
SemiMajorAxis 98304.460 km
Period 4.542 Days
Radius 2258.295 km
Mass 0.027646 M_earth
SemiMajorAxis 302025.266 km
With that in mind, the Rogue Planet reaches apparent Magnitude 15 at 88 AU from Earth on Halloween of 1976, slightly dimmer than Pluto's AppMag of 14.5 that same year, when Charon was discovered.
Now, take into accout all the sky surveys and exploration that were operating throughout the 20th century. Between 1976 and 2020, what might be decently realistic discovery dates for Rogue Planet and its moons?