The binary is roughly 1700 light years from Earth, in the constellation Cygnus. The two stars whirl around each other every 11 hours.
In 2013 and 2014, Molnar’s team discovered two things about KIC 9832227 that suggest an imminent explosion: the orbital period is decreasing, and it’s doing so at an ever-faster rate.
This is exactly what the contact binary that sparked the 2008 red nova did. The orbital period shrank because the two stars circled each other faster as they spiralled closer together.