For the past 13 years, NASA's New Horizons spacecraft has been bolting away from the sun at speeds in excess of 31,000 miles per hour, charting a course for the fringes of our solar system. In 2015, it made a close pass of Pluto, returning the highest resolution images of the erstwhile planet the world has ever seen. On New Year’s Eve, at 9:33 pm PT, it will make history again, when it soars past Ultima Thule—a small, cold, and mysterious world, the investigation of which could yield crucial clues about the formation of our planetary system some 4.5 billion years ago.

When it does, Ultima Thule (official designation: 2014 MU69) will become the most distant—and, astronomers suspect, the most primitive—celestial body humans have ever investigated up close. But nobody, not even New Horizons' mission scientists, will be able to monitor the event in real time. When the spacecraft zips past Ultima, it will be more than 4 billion miles from Earth. The signals it beams back will take more than six hours to reach the Johns Hopkins University Applied Physics Laboratory in Laurel, Maryland, base of operations for the New Horizons mission.

But that doesn't mean you can't follow along. Here's where to tune in, and what to expect from the mission in the first few hours and days of the new year.

Where to Watch

Tune in here beginning Monday, December 31st at 5pm PT/8pm ET for live coverage on NASA TV of the New Year's Eve flyby festivities at Johns Hopkins:

New Horizons is scheduled to zip past Ultima Thule at around 9:33 pm PT / 12:33 am ET. That means the party in Maryland will feature two countdown clocks: One to ring in the new year, and a second, timed to hit zero 33 minutes later, to mark the historic flyby. NASA TV coverage will continue until around 10:00 pm PT / 1:00 am ET, but it will take 6 hours and 7 minutes for the signal to travel from the Kuiper Belt to Earth, so news of a successful flyby won't reach us until later New Year's Day.

When to Expect Images

The downlink data rate between New Horizons and Earth is just 500 bits per second. That means that, in addition to the long signal transmission time, photos and other observational data will require additional time to actually download. It also means that low-resolution images should arrive relatively quickly, with larger images taking slightly longer. As the mission's principle investigator Alan Stern puts it: "In the days following the flyby, Ultima Thule's going to become a real thing, then a real thing with a shape, then a real thing with geology." Here's when to expect what: