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Hubble Returns To Normal Functioning Soon: NASA

After the engineering tests have been completed, Hubble is expected to soon return to normal science operations, NASA stated

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US shutdown delays space missions but NASA not grounded: Report,

NASA has brought Hubble Space Telescope’s seven-year old backup gyroscope (gyro) back to life, after the spacecraft entered safe mode due to a failed gyro earlier this month, the US space agency said on Tuesday.

A gyro is a device that measures the speed at which the spacecraft is turning and is needed to help Hubble turn and lock on to new targets.

Hubble’s backup gyro, which had been off for more than 7.5 years, was incorrectly returning extremely high rotation rates, NASA said in a statement.

Hubble
The Hubble Telescope hovering in space. Wikimedia Commons

This gyro was turned on after the spacecraft entered safe mode due to a failed gyro on October 5.

Additional tests will be performed to ensure Hubble can return to science operations with this gyro, NASA said.

To correct high rotation rates, the Hubble team executed a running restart of the gyro on October 16.

This procedure turned the gyro off for one second, and then restarted it before the wheel spun down.

However, the data showed no improvement in the gyro’s performance.

Hubble Telescope. red dwarf
This gyro was turned on after the spacecraft entered safe mode due to a failed gyro on October 5. Flickr

The team, then on October 18, commanded a series of spacecraft maneuvers, or turns, in opposite directions to attempt to clear any blockage that may have caused the float to be off-centre and produce the exceedingly high rates.

During each maneuver, the gyro was switched from high mode to low mode to dislodge any blockage that may have accumulated around the float.

They noticed a significant reduction in the high rates, allowing rates to be measured in low mode for brief periods of time.

On October 19, the team again commanded Hubble to perform additional maneuvers and gyro mode switches, which appear to have cleared the issue.

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The planet Mars is shown May 12, 2016 in this NASA Hubble Space Telescope view when it was 50 million miles from Earth. VOA

The rotation rates produced by the backup gyro have since reduced and are now within an expected range, NASA noted.

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The team plans to execute a series of tests to evaluate the performance of the gyro under conditions similar to those encountered during routine science observations, including moving to targets, locking on to a target, and performing precision pointing.

After these engineering tests have been completed, Hubble is expected to soon return to normal science operations, NASA stated. (IANS)

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Scientists Analysing Images Taken by NASA of Vikram Moon Lander

Therefore, it could be difficult to identify right now (and it) may be a little longer before we have another opportunity

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But he added, "It is important to remember that the illumination conditions right now where the lander may be are harsh." Pixabay

Scientists are analysing the images taken under harsh light conditions by the NASA Lunar Reconnaissance Orbiter (LRO) Camera of the area where the Vikram moon lander is likely to have touched down on the moon and it may be a while before they can locate it, project experts told IANS.

LRO project scientist at NASA’s Goddard Space Flight Center, Noah Petro, said on Wednesday that they were now analysing the images taken on Tuesday “and we will make a statement at some point when we can identify the lander.”

But he added, “It is important to remember that the illumination conditions right now where the lander may be are harsh.”

Therefore, it “could be difficult to identify right now (and it) may be a little longer before we have another opportunity to image the landing site next October 14” when the LRO next passes over that area of the moon.

Scientists, Images, NASA
Scientists are analysing the images taken under harsh light conditions by the NASA Lunar Reconnaissance Orbiter (LRO) Camera of the area. Pixabay

The principal investigator for the LRO camera, Mark Robinson of Arizona State University, said that the last image of the area was acquired on Wednesday and will take time to analyse as there are “lots and lots and lots of pixels” to go through.

A NASA statement carried a note of caution saying that when the LRO flew over the Vikram landing the “local lunar time was near dusk; large shadows covered much of the area.”

The LROC “acquired images around the targeted landing site, but the exact location of the lander was not known so the lander may not be in the camera field of view,” NASA said.

“The LROC team will analyze these new images and compare them to previous images to see if the lander is visible (it may be in shadow or outside the imaged area),” it added.

Also Read- India Grapples with Credit Issues

Vikram lost contact with the Indian Space Research Organisation after it was launched by the Chandraayan 2 moon orbiter to touch down in the area of the moon’s south pole on September 6.

After following the intended trajectory, it deviated in the final moments during the last two kilometres of the descent and went silent.

Vikram carried a rover called Pragyan that was to have conducted experiments on the moon’s surface.

Aviation Week created some confusion on Wednesday with an erroneous headline, “NASA’s LRO fails to spot Chandraayan 2 Lander,” which was picked up by others.

Scientists, Images, NASA
LRO project scientist at NASA’s Goddard Space Flight Center, Noah Petro, said on Wednesday that they were now analysing the images taken on Tuesday “and we will make a statement at some point . Pixabay

Both the scientists IANS spoke to said the headline was wrong.

Robinson said: “They are rather astonishing because we haven’t had the images to look at yet. I don’t know where that came from.”

Petro said, “The headline is wrong. That was actually posted even before we had the data on the ground.”

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The publication later changed the headline to “NASA’s LRO Begins Search For Silent Chandrayaan-2 Lander.” (IANS)