The information from the satellites could help scientists understand how elements are spread across the galaxy.
Discovered by an international team led by the Nicolaus Copernicus Astronomical Centre in Warsaw, the star named HD74423 is estimated to be 1.7 times the mass of the sun.
The object called 2020 CD3 and measuring just a few metres in diameter, entered Earth's orbit about three years ago. The ‘mini-moon’ circles the Earth every 47 days but is slipping from Earth’s gravitational pull and in few months will leave us.
The technique, which has already unearthed stars, allows scientists to see what is invisible.
The newly-discovered black hole, which researchers have called LB-1, is located 15,000 light-years from Earth and so far scientists have only known of black holes with masses below 50 times that of the sun.
If, as researchers believe, the 2l/Borisov comet comes from another galaxy this makes it a huge discovery: as the first comet from so far away and the second object from intergalactic space observed in the Solar System.
The team from the University of Warsaw say their unique map, which was based on observing 2,400 stars less than 250 million years old, is more accurate than models currently in use.
What started off as a hobby 15 years ago, last month turned into a fulltime business for the enthusiast.
Named by the Polish astronomers who found them, the planets could be just two of millions floating through the galaxy. So far, though, scientists have only managed to locate a dozen or so rogues, which is why adding these two to the bunch is deemed important.