Nomad by Matthew Mather.
Here is the description from Amazon:
Something big is coming… Big enough to destroy the entire solar system…
And it’s heading straight for Earth. That’s what Dr. Ben Rollins, head
of Harvard’s exoplanet research team, is told by NASA after being
dragged out of bed in the middle of the night. His first instinct is to
call his daughter, Jessica, who’s vacationing in Italy with his wife:
something is coming, he tells them, a hundred times the mass of our sun.
We can’t see it, we don’t know what it is, but it’s there. They’re
calling it Nomad, and the Earth may be destroyed in months.
I liked the story. It had several subplots, lots of good science, good characters and lots of great locations!
--Good read. Recommended!