Awaiting Yutu's phone home on lunar day 3

February 11th, 2014 by Ken Kremer, Universe Today in Astronomy & Space / Space Exploration
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


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

Will 'Yutu' phone home? Will Yutu live to see another Earthrise?

Those are the million dollar questions we're all awaiting the answer to on pins and needles as Lunar Day 3 begins for China's world famous 'Yutu' moon rover and Chang'e-3 lander, following a significant malfunction as night fell two weeks ago.

With the Sun due to rise over the Mare Imbrium , China's maiden pair of lunar probes are due to awaken at any moment now – and hopefully send good news.

Yutu – which means 'Jade Rabbit'- and the mothership lander have been sleeping through the utterly frigid two week long lunar night since they entered their second hibernation period on Jan. 24th and 25th respectively, according to Chinese space agency officials.

No communications are possible during the period of dormancy.

To get a clear view of Yutu's traverse across the Moon's magnificently desolate gray plains, be sure to check out our timelapse panoramic mosaic of Yutu's movements – above and below.

The 360 degree panorama by the imaging processing team of Ken Kremer and Marco Di Lorenzo was also newly featured on Astronomy Picture of the Day (APOD) on Feb 3, 2014.

However, as I reported earlier here, Yutu suffered a rather serious mechanical anomaly just as the sun was setting and causing China's moon mission team to urgently sprang into action.

Chang’e-3 lander and Yutu rover – from Above And Below Composite view shows China’s Chang’e-3 lander and Yutu rover from Above And Below (orbit and surface) – lander color panorama (top) and orbital view from NASA’s LRO orbiter (bottom). Chang’e-3 lander color panorama shows Yutu rover after it drove down the ramp to the moon’s surface and began driving around the landers right side to the south. Yellow lines connect craters seen in the lander panorama and the LROC image from LRO (taken at a later date after the rover had moved), red lines indicate approximate field of view of the lander panorama. Credit: CNSA/NASA/Ken Kremer/Marco Di Lorenzo/Mark Robinson

"Scientists are organizing repairs," wrote the People's Daily, the official government newspaper of China's ruling Communist Party.

Apparently one of the solar panels did not fold back properly over Yutu's instrument laden mast after it was lowered to the required horizontal position and into a warmed electronics box to shield and insulate it from the extremely frigid lunar night time temperatures.

The potentially deadly malfunction could spell doom for the unprotected mast mounted instruments and electronic systems, including the color and navigation cameras and the high gain antenna, if true.

During each 14 Earth-day long night, the Moon's temperatures plunge dramatically to below minus 180 Celsius, or minus 292 degrees Fahrenheit.

Traverse Path of Yutu rover from Dec. 14 landing to Dec. 21, 2013. Landscape textured with Chang’e 3 imagery from space and ground. Credit: CNSA/BACC

A radioisotopic heater unit keeps the Mast instruments warm, during lunar night, in the absence of solar power.

Dust accumulation on the rover and gears may possibly be to blame for the failure to retract, based on unofficial accounts.

China has not released any official or detailed information on the cause of the malfunction or recovery actions taken by Chinese space engineers.

So, no one knows the 'Jade Rabbits' fate at this time.

'Jade Rabbit' has been immensely popular with the Chinese public.

Photo of Chang’e-3 moon lander emblazoned with Chinese national flag taken by the panoramic camera on the Yutu moon rover on Dec. 22, 2013. Credit: CNSA

Over 36,000 well wishes were posted on an unofficial Sina Weibo account shortly after word of the mechanical anomaly was announced.

Lunar Day 3 at Mare Imbrium was due to start around this past weekend Feb. 8 or 9.

An anonymous writer on Weibo, China's twitter equivalent, reported; "We will hopefully get back news of the rabbit after sunrise today February 10 at 15:00 hrs (3 pm), Beijing local time, and confirm whether safe or unable to move." That is according to a google translation I used.

Both vehicles depend on their life giving solar panels to produce power in order to function and accomplish their scientific tasks during each Lunar day which lasts approximately 14 days.

They had been functioning perfectly and collecting science measurement as planned during Lunar Day 2.

'Jade Rabbit' had departed the landing site forever, and was journeying southwards as the incident occurred – about six weeks into its planned 3 month long roving expedition.

In a historic feat for China, the Chang'e-3 spacecraft safely touched down on the Moon at Mare Imbrium near the Bay of Rainbows some two months ago on Dec. 14, 2013 .

Seven hours later, the piggybacked 140 kg Yutu robot drove off a pair of ramps, onto the Moon and into the history books.

The 1200 kg stationary lander is expected to return science data about the Moon and 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 hugely popular probes could be the forerunners to a manned Chinese Moon landing mission a decade from now.

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.

Source: Universe Today

"Awaiting Yutu's phone home on lunar day 3." February 11th, 2014. http://phys.org/news/2014-02-awaiting-yutu-home-lunar-day.html