NASA Lunar Orbiter Solves Snag After Successful Launch

The LADEE spacecraft, which began its trip to the moon last night in a launch from Virginia's coast, has run into some mechanical problems, NASA says. Officials say the robotic orbiter remains on track, however, and its problems can be resolved before it reaches the moon next month.

"Team members are analyzing a situation with LADEE's reaction wheels, but say the spacecraft is communicating and working as designed, with plenty of time to resolve the issue before reaching lunar orbit," NASA says.

Update at 12:30 p.m. ET: Issue Is Resolved, NASA Says

In an update posted to Twitter, S. Peter Worden, director of NASA's Ames Center, says that the problem has been fixed.

"It appears the @NASALADEE start up issues have been resolved. Guess we just had to burp the baby"

Thank you to our readers for pointing the update out in the comments section.

Our original post continues:

Carried by a Minotaur V rocket, the craft burst into the night sky from the Wallops Flight Facility shortly before midnight Friday, leaving a bright trailing flame that was visible for hundreds of miles along the Eastern seaboard.

The launch inspired many amateur photographers to post their images of the craft's arcing path. NASA has compiled those photos in a Flickr group.

LADEE stands for Lunar Atmosphere and Dust Environment Explorer. The craft "will orbit the moon to gather detailed information about its atmosphere and the role of dust in the lunar sky," NASA says.

The AP has more on the technical issues facing the mission:

"S. Peter Worden, director of NASA's Ames Research Center in California, which developed the spacecraft, told reporters he's confident everything will be working properly in the next few days.

"LADEE's reaction wheels were turned on to orient and stabilize the spacecraft, which was spinning too fast after it separated from the final rocket stage, Worden said. But the computer automatically shut the wheels down, apparently because of excess current. He speculated the wheels may have been running a little fast."

The craft's reaction wheels are used "to position and stabilize the spacecraft," NASA says. Worden also said that the snag doesn't represent "an unusual event in spacecraft" and that there is no need to rush to fix the problem. LADEE is expected to reach the moon in 30 days.

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NASA plans to test laser communications link with upcoming lunar mission

An upcoming NASA mission will test a new laser communications system that could one day deliver high-definition 3D video signals from Mars and beyond.

The lunar laser communications demonstration will be part of the agency's Lunar Atmosphere and Dust Environment Explorer (LADEE) mission, which is scheduled to launch on Sept. 6. The LADEE spacecraft will orbit the moon and collect information on the lunar atmosphere—technically an exosphere—for around 100 days. A laser communications module is built into the satellite.

"NASA has a need for faster download speeds for data from space and that grows everyday, just like it does for the rest of us at home and also from work," said Don Cornwell, mission manager for the lunar laser communications demonstration. He was speaking at a televised NASA news conference on Thursday.

"We'd like to be able to send high-resolution images and movies and 3D even from satellites that not only orbit the Earth but also from probes that will go to the moon and beyond. Communicating with radio waves has served us well for the last 50 years but we now have the technology to use light waves to communicate more data," he said.

NASA Ames / Dana Berry

Here's how the system will work: When the satellite is in orbit around the moon and visible from Earth, one of three ground stations will shoot a laser towards its approximate location. The laser beam from Earth will scan a patch of sky and should illuminate the spacecraft at some point. When that happens, the spacecraft will begin transmitting its own laser towards the ground station and the two will lock on to each other. Once that happens, communications can begin.

The ground stations are at White Sands in New Mexico, at a NASA Jet Propulsion Laboratory site in Wrightwood, California, and a European Space Agency site in Tenerife, Spain.

The technology should allow an upstream data rate, from the Earth to the spacecraft, of around 20Mbps and a much faster downstream rate of 622Mbps. Home Internet speeds typically run from several megabits per second to several tens of megabits per second.

That's roughly six times the speed that's currently possible with radio-based transmission, said Cornwell. As a bonus, the laser communications equipment also weighs half that of a radio transmitter and costs about a quarter less, he said.

(See a video version of this story on YouTube.)

Cornwell said he hopes the test is the first step in demonstrating the usefulness of laser communications and building confidence in its use in future missions, including those that go deeper into space. He said laser communications systems get more attractive compared to radio the further the spacecraft travels from Earth because the communications beam can be better focused.

"As you go further out into the solar system, it's a much more efficient way to get high bandwidth at low power," said John Grunsfeld, NASA's associate administrator for science and a former astronaut.

"We've already been having discussions about how you could do laser communications on a rover on the surface of Mars," he said, referencing a NASA mission to Mars planned for 2020.

"This is just the beginning of what will be replacing some of the radio frequency communication in the future," said Grunsfeld. "I think there is no question that as we send humans further out into the solar system, certainly to Mars, that if we want to have high-def 3D video, we're going to have laser communications sending that information back."

Martyn Williams covers mobile telecoms, Silicon Valley and general technology breaking news for The IDG News Service.
More by Martyn Williams, IDG News Service

View the original article here

NASA plans to test laser communications link with upcoming lunar mission

An upcoming NASA mission will test a new laser communications system that could one day deliver high-definition 3D video signals from Mars and beyond.

The lunar laser communications demonstration will be part of the agency's Lunar Atmosphere and Dust Environment Explorer (LADEE) mission, which is scheduled to launch on Sept. 6. The LADEE spacecraft will orbit the moon and collect information on the lunar atmosphere—technically an exosphere—for around 100 days. A laser communications module is built into the satellite.

"NASA has a need for faster download speeds for data from space and that grows everyday, just like it does for the rest of us at home and also from work," said Don Cornwell, mission manager for the lunar laser communications demonstration. He was speaking at a televised NASA news conference on Thursday.

"We'd like to be able to send high-resolution images and movies and 3D even from satellites that not only orbit the Earth but also from probes that will go to the moon and beyond. Communicating with radio waves has served us well for the last 50 years but we now have the technology to use light waves to communicate more data," he said.

NASA Ames / Dana Berry

Here's how the system will work: When the satellite is in orbit around the moon and visible from Earth, one of three ground stations will shoot a laser towards its approximate location. The laser beam from Earth will scan a patch of sky and should illuminate the spacecraft at some point. When that happens, the spacecraft will begin transmitting its own laser towards the ground station and the two will lock on to each other. Once that happens, communications can begin.

The ground stations are at White Sands in New Mexico, at a NASA Jet Propulsion Laboratory site in Wrightwood, California, and a European Space Agency site in Tenerife, Spain.

The technology should allow an upstream data rate, from the Earth to the spacecraft, of around 20Mbps and a much faster downstream rate of 622Mbps. Home Internet speeds typically run from several megabits per second to several tens of megabits per second.

That's roughly six times the speed that's currently possible with radio-based transmission, said Cornwell. As a bonus, the laser communications equipment also weighs half that of a radio transmitter and costs about a quarter less, he said.

(See a video version of this story on YouTube.)

Cornwell said he hopes the test is the first step in demonstrating the usefulness of laser communications and building confidence in its use in future missions, including those that go deeper into space. He said laser communications systems get more attractive compared to radio the further the spacecraft travels from Earth because the communications beam can be better focused.

"As you go further out into the solar system, it's a much more efficient way to get high bandwidth at low power," said John Grunsfeld, NASA's associate administrator for science and a former astronaut.

"We've already been having discussions about how you could do laser communications on a rover on the surface of Mars," he said, referencing a NASA mission to Mars planned for 2020.

"This is just the beginning of what will be replacing some of the radio frequency communication in the future," said Grunsfeld. "I think there is no question that as we send humans further out into the solar system, certainly to Mars, that if we want to have high-def 3D video, we're going to have laser communications sending that information back."

Martyn Williams covers mobile telecoms, Silicon Valley and general technology breaking news for The IDG News Service.
More by Martyn Williams, IDG News Service

View the original article here