NASA’s New Horizons Takes Photos of Ultima Thule, 4 Billion Miles Away

S. Alan Stern, center, New Horizons’ principal investigator, surrounded by children at Johns Hopkins University Applied Physics Laboratory in Laurel, Md., on Tuesday.

LAUREL, Md. — Thirty-three minutes into the new year, scientists, engineers and well-wishers here at the Johns Hopkins Applied Physics Laboratory celebrated the moment that NASA’s New Horizons spacecraft made its closest approach to a small, icy world nicknamed Ultima Thule.

Almost 10 hours later, the New Horizons team finally received confirmation that the spacecraft had executed its planned observations flawlessly. In the days and months to come, the mission’s scientists expect to receive pictures of Ultima Thule and scientific data that could lead to discoveries about the origins of the sun and the planets.

[See the latest pictures of Ultima Thule here when they’re released.]

That is the latest triumph in a journey that started in 2006, when the spacecraft launched on a mission to explore Pluto. Thirteen years and more than four billion miles later, New Horizons has provided humanity’s first glimpse of a distant fragment that could be unchanged from the solar system’s earliest days.

Ultima Thule, the name that the mission team selected for the object from more than 34,000 suggestions from the public, means “beyond the borders of the known world.” (Thule is pronounced “TOO-lee.”)

[Sign up to get reminders for space and astronomy events on your calendar.]

During the flyby, at a distance of about 2,200 miles, the spacecraft was out of communication with Earth because it was busy making scientific observations. Only hours later did New Horizons turn its antenna toward home. Then, it sent a 15-minute update, confirming it had survived the flyby. The message took six hours to travel the 4.1 billion miles at the speed of light to Earth. Future transmissions are expected to convey new pictures and readings from the flyby.

At 10:31 a.m., the operations center at Johns Hopkins, which runs the mission for NASA, confirmed that a radio dish in Madrid, part of NASA’s Deep Space Network, had locked in to the signal from New Horizons.

“We have a healthy spacecraft,” Alice Bowman, the mission operations manager, announced following a methodical check of the spacecraft’s systems. “We’ve just accomplished the most distant flyby.”

Clapping and cheering erupted in the room where the mood had been quiet and nervous a few minutes earlier.

“I don’t know about you, but I’m really liking this 2019 thing so far,” S. Alan Stern, the mission’s principal investigator, said at the start of a news conference on Tuesday.

The scientists revealed new images of Ultima Thule, taken when the spacecraft was still a half million miles away.

“Even though it's a pixelated blob still,” said Harold A. Weaver, Jr., the project scientist, “it's a better pixelated blob.”

Ultima Thule looked like a fuzzy bowling pin or a peanut, roughly 22 miles tall and 9 miles wide. The images also solved a mystery: why Ultima Thule’s brightness appeared unchanging as the spacecraft approached.

Typically, a spinning, irregularly shaped object would rhythmically brighten and dim as it spins.

It turns out that the long-distance camera aboard New Horizons was looking down at one of the poles of Ultima Thule, and thus it was always the same side of the object reflecting sunlight. “It’s almost like a propeller blade,” Dr. Weaver said. “That explains everything.”

The few fuzzy images so far sent home have not yet cleared up how long it takes for the small world to complete a single revolution.

Another question that has not yet been answered is whether Ultima Thule could actually be two small bodies in tight orbit around each other. Dr. Stern and Dr. Weaver said it was more likely that Ultima was a single object.

“If I’m wrong, I’ll tell you tomorrow,” Dr. Stern said. “If it’s two separate objects, this would be an unprecedented situation, in terms of how close they’re orbiting one another. It’d be spectacular to see, and I’d love to see it, but I think the higher probability is that it’s a single body.”

As additional images are sent back to Earth, the scientists will get a clearer picture of the object.

“By tomorrow and the next day, Ultima Thule is going to be a completely different world from what we’re seeing now,” Dr. Weaver said.

The scientists will begin to start counting craters, mapping the surface, looking for moons and rings around Ultima Thule and identifying materials on the surface. By doing so, they hope to gain a better understanding of the thousands of small bodies in the Kuiper belt, a region beyond Neptune strewn with icy debris.

Because the spacecraft is far away, it will take 20 months for all of the data to trickle back. The highest-resolution images taken at closest approach are not scheduled to be sent to Earth until February.

The scientists will continue to pore over incoming data this week, but then take a pause when the sun is in between Earth and the spacecraft, blocking communications. They will meet up again in mid-January.

On New Year’s Eve, revelers at the lab celebrated both the start of 2019 and the flyby. They were treated to the debut of a recorded music video by Brian May, best known as the lead guitarist of the rock band Queen but also an astrophysicist working with the mission’s science team. Dr. May’s new song, “New Horizons,” was written for the occasion at the request of Dr. Stern.

New Horizons to explore

New Horizons no one has ever seen before

Dr. May said he was initially reluctant when Dr. Stern asked. “I thought this is going to be hard, because I can’t think of anything that rhymes with Ultima Thule,” he said.

For most of the rest of his time here, Dr. May has been contributing to the scientific work. “I’m not here as a celebrity,” he said.

Ms. Bowman said this flyby was different from the spacecraft’s Pluto encounter three and a half years ago, where the closest approach occurred during the morning and the spacecraft called home in the evening — all in a single day’s work.

This time, they went home after celebrating and came back to work in the morning, still not knowing for sure whether the celebration was warranted.

“I think I was probably a little bit more nervous this time,” she said.

Dr. Stern said he had a different experience. “I was extremely confident in the spacecraft and our team,” he said. “I had the normal morning coming into work. I got a nice night’s sleep.”

In Other News

NASA’s New Horizons Takes Photos of Ultima Thule, 4 Billion Miles Away

S. Alan Stern, center, New Horizons’ principal investigator, surrounded by children at Johns Hopkins University Applied Physics Laboratory in Laurel, Md., on Tuesday.

LAUREL, Md. — Thirty-three minutes into the new year, scientists, engineers and well-wishers here at the Johns Hopkins Applied Physics Laboratory celebrated the moment that NASA’s New Horizons spacecraft made its closest approach to a small, icy world nicknamed Ultima Thule.

Almost 10 hours later, the New Horizons team finally received confirmation that the spacecraft had executed its planned observations flawlessly. In the days and months to come, the mission’s scientists expect to receive pictures of Ultima Thule and scientific data that could lead to discoveries about the origins of the sun and the planets.

[See the latest pictures of Ultima Thule here when they’re released.]

That is the latest triumph in a journey that started in 2006, when the spacecraft launched on a mission to explore Pluto. Thirteen years and more than four billion miles later, New Horizons has provided humanity’s first glimpse of a distant fragment that could be unchanged from the solar system’s earliest days.

Ultima Thule, the name that the mission team selected for the object from more than 34,000 suggestions from the public, means “beyond the borders of the known world.” (Thule is pronounced “TOO-lee.”)

[Sign up to get reminders for space and astronomy events on your calendar.]

During the flyby, at a distance of about 2,200 miles, the spacecraft was out of communication with Earth because it was busy making scientific observations. Only hours later did New Horizons turn its antenna toward home. Then, it sent a 15-minute update, confirming it had survived the flyby. The message took six hours to travel the 4.1 billion miles at the speed of light to Earth. Future transmissions are expected to convey new pictures and readings from the flyby.

At 10:31 a.m., the operations center at Johns Hopkins, which runs the mission for NASA, confirmed that a radio dish in Madrid, part of NASA’s Deep Space Network, had locked in to the signal from New Horizons.

“We have a healthy spacecraft,” Alice Bowman, the mission operations manager, announced following a methodical check of the spacecraft’s systems. “We’ve just accomplished the most distant flyby.”

Clapping and cheering erupted in the room where the mood had been quiet and nervous a few minutes earlier.

“I don’t know about you, but I’m really liking this 2019 thing so far,” S. Alan Stern, the mission’s principal investigator, said at the start of a news conference on Tuesday.

The scientists revealed new images of Ultima Thule, taken when the spacecraft was still a half million miles away.

“Even though it's a pixelated blob still,” said Harold A. Weaver, Jr., the project scientist, “it's a better pixelated blob.”

Ultima Thule looked like a fuzzy bowling pin or a peanut, roughly 22 miles tall and 9 miles wide. The images also solved a mystery: why Ultima Thule’s brightness appeared unchanging as the spacecraft approached.

Typically, a spinning, irregularly shaped object would rhythmically brighten and dim as it spins.

It turns out that the long-distance camera aboard New Horizons was looking down at one of the poles of Ultima Thule, and thus it was always the same side of the object reflecting sunlight. “It’s almost like a propeller blade,” Dr. Weaver said. “That explains everything.”

The few fuzzy images so far sent home have not yet cleared up how long it takes for the small world to complete a single revolution.

Another question that has not yet been answered is whether Ultima Thule could actually be two small bodies in tight orbit around each other. Dr. Stern and Dr. Weaver said it was more likely that Ultima was a single object.

“If I’m wrong, I’ll tell you tomorrow,” Dr. Stern said. “If it’s two separate objects, this would be an unprecedented situation, in terms of how close they’re orbiting one another. It’d be spectacular to see, and I’d love to see it, but I think the higher probability is that it’s a single body.”

As additional images are sent back to Earth, the scientists will get a clearer picture of the object.

“By tomorrow and the next day, Ultima Thule is going to be a completely different world from what we’re seeing now,” Dr. Weaver said.

The scientists will begin to start counting craters, mapping the surface, looking for moons and rings around Ultima Thule and identifying materials on the surface. By doing so, they hope to gain a better understanding of the thousands of small bodies in the Kuiper belt, a region beyond Neptune strewn with icy debris.

Because the spacecraft is far away, it will take 20 months for all of the data to trickle back. The highest-resolution images taken at closest approach are not scheduled to be sent to Earth until February.

The scientists will continue to pore over incoming data this week, but then take a pause when the sun is in between Earth and the spacecraft, blocking communications. They will meet up again in mid-January.

On New Year’s Eve, revelers at the lab celebrated both the start of 2019 and the flyby. They were treated to the debut of a recorded music video by Brian May, best known as the lead guitarist of the rock band Queen but also an astrophysicist working with the mission’s science team. Dr. May’s new song, “New Horizons,” was written for the occasion at the request of Dr. Stern.

New Horizons to explore

New Horizons no one has ever seen before

Dr. May said he was initially reluctant when Dr. Stern asked. “I thought this is going to be hard, because I can’t think of anything that rhymes with Ultima Thule,” he said.

For most of the rest of his time here, Dr. May has been contributing to the scientific work. “I’m not here as a celebrity,” he said.

Ms. Bowman said this flyby was different from the spacecraft’s Pluto encounter three and a half years ago, where the closest approach occurred during the morning and the spacecraft called home in the evening — all in a single day’s work.

This time, they went home after celebrating and came back to work in the morning, still not knowing for sure whether the celebration was warranted.

“I think I was probably a little bit more nervous this time,” she said.

Dr. Stern said he had a different experience. “I was extremely confident in the spacecraft and our team,” he said. “I had the normal morning coming into work. I got a nice night’s sleep.”

In Other News

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