The New Horizons Spacecraft, traveling at 32,000 miles (51,500 kilometers) per hour, has reached the halfway point between Pluto and its new Kuiper Belt object target.
NASA’s New Horizons Spacecraft continues to travel toward the outer regions of the solar system on a path to Kuiper Belt object (KBO) 2014 MU69, which it will fly past on January 1, 2019. New Horizons recently passed the midway point between Pluto – its storied first target – and MU69, reaching that milestone at midnight on 8 p.m. ET on April 2 when it was 486.19 million miles (782.45 million kilometers) beyond Pluto.
“It’s fantastic to have completed half the journey to our next flyby; that flyby will set the record for the most distant world ever explored in the history of civilization,” said Alan Stern, New Horizons principal investigator from the Southwest Research Institute in Boulder, Colorado.
On April 7 the New Horizons Spacecraft will reach the halfway point in time between closest approaches to Pluto, which occurred at 7:48 a.m. ET on July 14, 2015, and MU69, predicted for 2 a.m. ET on New Year’s Day 2019. The gravitational tug of the sun is responsible for the nearly five-day difference between the halfway markers of distance and time. The spacecraft is actually getting slightly slower as it pulls away from the sun’s gravity, so the spacecraft crosses the midpoint in distance a bit before it passes the midpoint in time.
Ready for a Rest
The New Horizons Spacecraft will be sleeping through the April 7 halfway timing marker to MU69 because mission operators at the Johns Hopkins Applied Physics Laboratory plan to put the spacecraft into hibernation two hours beforehand.
New Horizons has been “awake” for almost two and a half years, since December 6, 2014, and the scheduled 157-day hibernation is hard-earned. During this “awake” time, New Horizons had its historic encounter with Pluto and 16 subsequent months of relaying the data from that encounter back to Earth, has made distant observations of a dozen Kuiper Belt objects, collected unique data on the dust and charged-particle environment of the Kuiper Belt, and studied the hydrogen gas that permeates the vast space surrounding the sun.
“The January 2019 MU69 flyby is the next big event for us, but New Horizons is truly a mission to more broadly explore the Kuiper Belt,” said Hal Weaver, New Horizons project scientist from the Applied Physics Laboratory. “In addition to MU69, we plan to study more than two dozen other KBOs in the distance and measure the charged particle and dust environment all the way across the Kuiper Belt.”
Currently the New Horizons Spacecraft is 3.5 billion miles (5.7 billion kilometers) from Earth. At that distance a radio signal sent from the operations team – and traveling at light speed – needs about five hours and 20 minutes to reach the spacecraft. All spacecraft systems are healthy and operating normally, and the spacecraft is on course for its MU69 flyby.