Universe Today
Yutu
Lives!
The little 'rabbit' beloved worldwide has now phoned home and actually survived the perils of the long lunar night and is alive and awake to start a 3rd day of scientific exploration despite
suffering a serious malfunction
as it entered the latest hibernation period two weeks ago.
"Yutu has come back to life!" said Pei Zhaoyu, the spokesperson for
China's lunar probe
program, according to a breaking news report by the state owned Xinhua news agency.
"Experts are still working to verify the causes of its mechanical control abnormality."
The
Chang'e-3 mothershi
p lander and piggybacked Yutu surface rover soft landed on
the Moon
on Dec. 14, 2013 at Mare Imbrium (Sea of Rains) - marking China's first successful spacecraft landings on an extraterrestrial body in history.
Yutu's new lease on life also comes after Monday's (Feb. 11) premature report of the robots demise by the state owned China News Service, reported
here
.
However, "Yutu failed to power-up Monday [Feb 11] and data about its current condition and repair progress is still being collected and analyzed," Xinhua and CCTV (China state run television) reported.
This indicates that
Yutu
was in fact feared lost for some time by the mission team, until further efforts finally resulted in the detection of a signal from the spacecraft - and a welcome reversal of yesterdays news!
The robot "has now been restored to its normal signal reception function," says Pei.
[caption id="attachment_109330" align="aligncenter" width="580"]
Side by side screenshot photos of the Chang'e-3 moon lander (L) and the Yutu moon rover during the mutual-photograph process, at the Beijing Aerospace Control Center in Beijing, on Dec. 15, 2013. The moon rover and the moon lander took photos of each other marking the complete success of the Chang'e-3 lunar probe mission. (Xinhua/Ding Lin)[/caption]
Earlier today (Feb. 12) amateur radio operators at UHF-satcom reported detection of a signal from Yutu.
But much technical work remains ahead for the engineering and science teams to ascertain why it malfunctioned and whether
the six wheeled rover
can be restored to partial or full functionality.
As night fell on Jan. 25, the rover entered its second two week long period of dormancy just as the rover "experienced a mechanical control abnormality," according to a report by China's official government newspaper, The People's Daily.
"Yutu
went into sleep
under an abnormal status," Pei said.
"Experts were initially concerned that it might not be able to survive the extremely low temperatures during the lunar night."
[caption id="attachment_108417" align="aligncenter" width="580"]
360-degree time-lapse color panorama from China's Chang'e-3 lander This 360-degree time-lapse color panorama from China's Chang'e-3 lander shows the Yutu rover at three different positions during its trek over the Moon's surface at its landing site from Dec. 15-22, 2013 during the 1st Lunar Day. Credit: CNSA/Chinanews/Ken Kremer/Marco Di Lorenzo – kenkremer.com. See our Yutu timelapse pano at NASA APOD Feb. 3, 2014: http://apod.nasa.gov/apod/ap140203.htm[/caption]
Each lunar day and night lasts for alternating periods of 14 Earth days.
During each
long night
, the Moon's temperatures plunge dramatically to below minus 180 Celsius, or minus 292 degrees Fahrenheit.
Both solar powered probes must enter hibernation mode during each lunar night to conserve energy and protect their science instruments and control mechanisms, computers and electronics.
"The rover stands a chance of being saved now that it is still alive," Pei stated.
Yutu, which translates as 'Jade Rabbit' is named after the rabbit in Chinese mythology that lives on the Moon as a pet of the Moon goddess Chang'e.
'Jade Rabbit' had departed the landing site forever, and was journeying southwards as the anomoly occurred – about six weeks into its planned 3 month long moon roving expedition to investigate the moon's surface composition and natural resources.
The 140 kg Yutu
robot is located some 100 m south of the lander.
[caption id="attachment_108405" align="aligncenter" width="410"]
Traverse Path of Yutu rover from Dec. 14 landing to Dec. 21. Landscape textured with Chang'e 3 imagery from space and ground. Credit: CNSA/BACC[/caption]
Definitive word about the
Chang'e-3 lander
has not yet been announced. But it is expected to survive since no malfunctions have been reported. It has a 1 year design lifetime.
Xinhua stated that Chinese space officials will comment on the landers status soon.
The 1200 kg stationary lander is expected to return science data about the Moon and conduct telescopic observations of the Earth and celestial objects for at least one year.
Chang'e-3 and Yutu landed on a thick deposit of volcanic material.
The inaugural pair of probes could be the forerunners to a
manned Chinese Moon landing
mission a decade from now.
China's current plans call for the Chang'e-4 Moon lander/rover to launch in 2016, perhaps with some upgrades and lessons learned from the ongoing mission.
China is only the 3rd country in the world to
successfully soft land
a spacecraft on Earth's nearest neighbor after the United States and the Soviet Union.
Stay tuned here for
Ken's
continuing Chang'e-3, Orion, Orbital Sciences, SpaceX, commercial space, LADEE, Mars and more planetary and human spaceflight news.
Ken Kremer