APOD: Yutu 2 on the Farside (2019 Jan 05)

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APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by APOD Robot » Sat Jan 05, 2019 5:05 am

Image Yutu 2 on the Farside

Explanation: On January 3, the Chinese Chang'e-4 spacecraft made the first successful landing on the Moon's farside. Taken by a camera on board the lander, this image is from the landing site inside Von Karman crater. It shows the desksized, six-wheeled Yutu 2 (Jade Rabbit 2) rover as it rolled down lander ramps and across the surface near local sunrise and the start of the two week long lunar day. Ripe for exploration, Von Karman crater itself is 186 kilometers in diameter. It lies within the Moon's old and deep South Pole-Aitken impact basin with some of the most ancient and least understood lunar terrains. To bridge communications from the normally hidden hemisphere of the Moon, China launched a relay satellite, Queqiao, in May of 2018 in to an orbit beyond the lunar farside.

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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by rochelimit » Sat Jan 05, 2019 8:10 am

Kudos to China! common US you can do it too!

DL MARTIN

Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by DL MARTIN » Sat Jan 05, 2019 11:38 am

Wondering if China should have naming rights.

Guest

Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by Guest » Sat Jan 05, 2019 1:48 pm

Good to see the rover on the surface. I hope the Chinese the science they find in real time. I am impressed with the landing, but given the crater 'right outside the garage door', things could have gone differently. Nature has a way of interfering sometime. But the Chinese have demonstrated excellent planning, engineering and the benefits of the luck of the universe. An amazing thing to have done.

But in looking at the photo, and given the terrain the rover will travail, are the wheels of the rover sized large enough?

Still 'Bravo Zulu' (a naval military reference) to all involved, and name whatever you find. It is the right of the discoverer to do so.

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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by neufer » Sat Jan 05, 2019 1:56 pm

DL MARTIN wrote:
Sat Jan 05, 2019 11:38 am

Wondering if China should have naming rights.
https://www.airspacemag.com/daily-planet/how-are-places-on-the-moon-named-48457/ wrote:
<<The Moon is remarkable for the variety and unusual nature of the names of its surface features. The dark, smooth maria are named for weather or states of mind (Sea of Rains, Sea of Tranquility) while many of the abundant craters of the Moon are named for famous scientists, philosophers, mathematicians and explorers. Before the advent of the space age, only the near side of the Moon was visible, although most scientists believed that the far side probably looked exactly like the one facing Earth. (How wrong they were!) Naturally, once we had the ability to see uncharted lunar territory, a new era of name assignment commenced. But even now, many lunar craters and features await something more than mere coordinates.

The drawings by Galileo of the Moon in 1610 show craters and mountain ranges but he did not assign names to them. As telescopes improved, revealing finer surface details, several maps appeared with names bestowed by their astronomer authors to flatter patrons or express their nationalism. Most of those early names have been forgotten to history. In 1651, an influential map by Jesuit astronomers Grimaldi and Riccioli became the foundation for the official naming reference guide that we use today.

With the flight of the Luna 3 probe in 1959, the Soviet Union was the first nation to image the far side of the Moon. To the surprise of most, large regions of maria (so prominent on the near side) were mostly missing from the far side. Although the first images were of very low quality, the Soviets couldn’t resist the urge to name newly discovered features for a variety of Russian heroes and place names, such as Tsiolkovsky and the Sea of Moscow. Some new “features” were misidentified because of the low resolution – the name “Soviet Mountains” (no longer used) was given to a bright linear streak across the far side globe (a feature that turned out to be a long ray from the fresh crater Giordano Bruno and not a mountain range).

Over subsequent years, as both American and Soviet spacecraft filled in the far side coverage with increasingly higher quality images, most major far side craters received names of various scientists and engineers. From around the world, a mixed bag of names were submitted to the International Astronomical Union (IAU – the body of scientists who authorize the names of planetary surface features) for consideration and approval. Although some were historically significant, many were people with whom few were familiar.>>
Art Neuendorffer

kurth

Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by kurth » Sat Jan 05, 2019 2:28 pm

How big is that small impact crater just off the lander ramp I wonder. I wonder if the caked lunar dust is thick enough so it would soften the impact of the asteroid? It might still be intact.

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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by BDanielMayfield » Sat Jan 05, 2019 3:07 pm

This must be just a bi-color, white and red image? (Not a complaint, just an observation/question)

This is an outstanding accomplishment for any space program.
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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by Chris Peterson » Sat Jan 05, 2019 3:09 pm

kurth wrote:
Sat Jan 05, 2019 2:28 pm
How big is that small impact crater just off the lander ramp I wonder. I wonder if the caked lunar dust is thick enough so it would soften the impact of the asteroid? It might still be intact.
When objects hit at kilometers per second (which everything does on the Moon) there's not a lot of difference between hitting regolith and hitting rock in terms of the impactor itself (it does effect crater morphology somewhat).

On Earth you can get impact pits, because the body can be slowed down to a few hundred meters per second or less, but not on the Moon. Pretty much every impact will be a cratering event, and except for very massive impactors, will probably vaporize the impacting body.
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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by Chris Peterson » Sat Jan 05, 2019 3:20 pm

BDanielMayfield wrote:
Sat Jan 05, 2019 3:07 pm
This must be just a bi-color, white and red image? (Not a complaint, just an observation/question)
The image was made with the Terrain Camera (TCAM) on the lander. That camera uses a CMOS sensor with a Bayer filter array... that is, pretty much a standard color sensor like you'd find in any camera. So the image is "true color". Of course, that's not to say it has been through whatever full processing workflow is utilized to calibrate color. But it is an RGB image, not a monochrome image case into a range of reds.
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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by BDanielMayfield » Sat Jan 05, 2019 4:42 pm

Chris Peterson wrote:
Sat Jan 05, 2019 3:20 pm
BDanielMayfield wrote:
Sat Jan 05, 2019 3:07 pm
This must be just a bi-color, white and red image? (Not a complaint, just an observation/question)
The image was made with the Terrain Camera (TCAM) on the lander. That camera uses a CMOS sensor with a Bayer filter array... that is, pretty much a standard color sensor like you'd find in any camera. So the image is "true color". Of course, that's not to say it has been through whatever full processing workflow is utilized to calibrate color. But it is an RGB image, not a monochrome image case into a range of reds.
Well that's a bit surprising Chris. There doesn't appear to be any green or blue at all...

On the reporting of this historic mission I've been appalled by how often this landing has been said to have been made on the so called "Dark side of the Moon"! I mean, can't they SEE that it's sitting in full sunlight? How doorknob dumb can you get? And, this hasn't been just local yokels either, national news outlets have also repeatedly made this gaff. :lol2: :roll: :facepalm:
"Happy are the peaceable ... "

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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by APODFORIST » Sat Jan 05, 2019 5:26 pm

BDanielMayfield wrote:
Sat Jan 05, 2019 4:42 pm
On the reporting of this historic mission I've been appalled by how often this landing has been said to have been made on the so called "Dark side of the Moon"! I mean, can't they SEE that it's sitting in full sunlight? How doorknob dumb can you get? And, this hasn't been just local yokels either, national news outlets have also repeatedly made this gaff. :lol2: :roll: :facepalm:
Dark means unknown in this context. Unknown things often seem gloomy. It is not meant literally but as a metaphor.

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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by Chris Peterson » Sat Jan 05, 2019 5:34 pm

APODFORIST wrote:
Sat Jan 05, 2019 5:26 pm
BDanielMayfield wrote:
Sat Jan 05, 2019 4:42 pm
On the reporting of this historic mission I've been appalled by how often this landing has been said to have been made on the so called "Dark side of the Moon"! I mean, can't they SEE that it's sitting in full sunlight? How doorknob dumb can you get? And, this hasn't been just local yokels either, national news outlets have also repeatedly made this gaff. :lol2: :roll: :facepalm:
Dark means unknown in this context. Unknown things often seem gloomy. It is not meant literally but as a metaphor.
Occasionally, maybe. But usually it's just a stupid slip, a combination of ignorance and falling into a common English phrase that simply doesn't apply.
Chris

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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by BDanielMayfield » Sat Jan 05, 2019 5:47 pm

Chris Peterson wrote:
Sat Jan 05, 2019 5:34 pm
APODFORIST wrote:
Sat Jan 05, 2019 5:26 pm
Dark means unknown in this context. Unknown things often seem gloomy. It is not meant literally but as a metaphor.
Occasionally, maybe. But usually it's just a stupid slip, a combination of ignorance and falling into a common English phrase that simply doesn't apply.
APODFORIST is being quite charitable. Many of these pretty faced reporters wouldn't know what a metaphor is.
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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by Cousin Ricky » Sat Jan 05, 2019 6:26 pm

APODFORIST wrote:
Sat Jan 05, 2019 5:26 pm
BDanielMayfield wrote:
Sat Jan 05, 2019 4:42 pm
On the reporting of this historic mission I've been appalled by how often this landing has been said to have been made on the so called "Dark side of the Moon"! I mean, can't they SEE that it's sitting in full sunlight? How doorknob dumb can you get? And, this hasn't been just local yokels either, national news outlets have also repeatedly made this gaff. :lol2: :roll: :facepalm:
Dark means unknown in this context. Unknown things often seem gloomy. It is not meant literally but as a metaphor.
Using “dark” as a metaphor in this oft-misunderstood context would be irresponsible. I think it more likely that the editors were ignorant and didn’t understand or carefully read the articles before assigning the headline. (The one article I saw with such a headline did not make the same mistake in the article text.)

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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by neufer » Sat Jan 05, 2019 6:41 pm


.
.
.
.
rochelimit wrote:
Sat Jan 05, 2019 8:10 am

Kudos to China!

com'mon US you can do it too!
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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by FLPhotoCatcher » Sat Jan 05, 2019 7:39 pm

BDanielMayfield wrote:
Sat Jan 05, 2019 3:07 pm

Well that's a bit surprising Chris. There doesn't appear to be any green or blue at all...
There IS some blue in the lower-right corner...
But seriously, it does look too red. Maybe it's to honor the Communist Party?

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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by Boomer12k » Sat Jan 05, 2019 8:49 pm

neufer wrote:
Sat Jan 05, 2019 6:41 pm

.
.
.
.
rochelimit wrote:
Sat Jan 05, 2019 8:10 am

Kudos to China!

com'mon US you can do it too!
"I told you to pull over and ask for directions, but NOOOoooo..."

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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by Boomer12k » Sat Jan 05, 2019 8:53 pm

Go for it little rover...Ding HAO!!!

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ruby carat

Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by ruby carat » Sat Jan 05, 2019 9:51 pm

Congratulations to the whole team of explorers!

heehaw

Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by heehaw » Sat Jan 05, 2019 10:19 pm

The Russians were the first to SEE the far side of the moon.
The Chinese are now the first to LAND on the far side of the moon.
Who will be the first to STROLL on the far side of the moon?

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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by neufer » Sat Jan 05, 2019 11:21 pm

FLPhotoCatcher wrote:
Sat Jan 05, 2019 7:39 pm
BDanielMayfield wrote:
Sat Jan 05, 2019 3:07 pm

Well that's a bit surprising Chris. There doesn't appear to be any green or blue at all...
There IS some blue in the lower-right corner...

But seriously, it does look too red. Maybe it's to honor the Communist Party?
Art Neuendorffer

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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by Chris Peterson » Sun Jan 06, 2019 12:03 am

BDanielMayfield wrote:
Sat Jan 05, 2019 4:42 pm
Chris Peterson wrote:
Sat Jan 05, 2019 3:20 pm
BDanielMayfield wrote:
Sat Jan 05, 2019 3:07 pm
This must be just a bi-color, white and red image? (Not a complaint, just an observation/question)
The image was made with the Terrain Camera (TCAM) on the lander. That camera uses a CMOS sensor with a Bayer filter array... that is, pretty much a standard color sensor like you'd find in any camera. So the image is "true color". Of course, that's not to say it has been through whatever full processing workflow is utilized to calibrate color. But it is an RGB image, not a monochrome image case into a range of reds.
Well that's a bit surprising Chris. There doesn't appear to be any green or blue at all...
Quite a lot of signal on the other channels, actually.
_
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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by neufer » Sun Jan 06, 2019 3:18 am

Chris Peterson wrote:
Sun Jan 06, 2019 12:03 am
BDanielMayfield wrote:
Sat Jan 05, 2019 4:42 pm
Chris Peterson wrote:
Sat Jan 05, 2019 3:20 pm

The image was made with the Terrain Camera (TCAM) on the lander. That camera uses a CMOS sensor with a Bayer filter array... that is, pretty much a standard color sensor like you'd find in any camera. So the image is "true color". Of course, that's not to say it has been through whatever full processing workflow is utilized to calibrate color. But it is an RGB image, not a monochrome image case into a range of reds.
Well that's a bit surprising Chris. There doesn't appear to be any green or blue at all...
Quite a lot of signal on the other channels, actually.
For some reason they never bothered to include the other channels to produce a typical grey lunar landscape.

Grey isn't really their color.
  • My grandmother's missionary cousin Mary McClure had to run from the
    Chinese Red Army in 1936 but was eventually captured by the Japanese in 1942:
http://dcollections.oberlin.edu/cdm/compoundobject/collection/p15963coll9/id/182379 wrote:
1936-03-23: SHANSI EXTRA World Flash et By United Press. Protection For China American educators and missionaries and their families sought refuge here or Inside the city walls of Taiku and Fenchow today from a Communistic army advancing through Khans province to the west General Yen has answered a request of the American Embassy for protection of missionaries by promising that he will see that they reach safety in towns in the Red armys path Newspapers report that the Communists have surrounded him.

Mary McClure is in Fenchow. Oberlin refugees who reached Peiping safely were Mr Raymond Moyer 21 head of the Oberlin in China and his wife and children. Fear was expressed for Mary McClure Oberlin graduate and the six Americans in Fenchow as Red armies completely cut off this city from the rest of the country Late reports indicated however that the communist horde might be headed in a northwesterly direction skirting Fenchow and bearing toward Taiku Airplanes from Taiku were scouting the territory and loyalist army officialspromised protection to the Americans in that city
https://archive.org/stream/oberlinalumnimag1946ober_t9p9/oberlinalumnimag1946ober_t9p9_djvu.txt wrote:
  • Another exhibition presented the bequest of the late Mary McClure,
    which includes many fine Chinese bronzes and excellent paintings. Miss
    McClure studied in the Oberlin Academy and in the College of Arts and
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    She was returning to China in 1944 when she died in Calcutta, India.
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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by APODFORIST » Sun Jan 06, 2019 11:38 am

I'm curious about more pictures. Does anyone know a page - maybe a Chinese one - where you can see more current pictures?

So far I've only seen another picture where the rover took a slight right turn towards the crater.

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Re: APOD: Yutu 2 on the Farside (2019 Jan 05)

Post by geckzilla » Sun Jan 06, 2019 7:17 pm

BDanielMayfield wrote:
Sat Jan 05, 2019 5:47 pm
Chris Peterson wrote:
Sat Jan 05, 2019 5:34 pm
APODFORIST wrote:
Sat Jan 05, 2019 5:26 pm
Dark means unknown in this context. Unknown things often seem gloomy. It is not meant literally but as a metaphor.
Occasionally, maybe. But usually it's just a stupid slip, a combination of ignorance and falling into a common English phrase that simply doesn't apply.
APODFORIST is being quite charitable. Many of these pretty faced reporters wouldn't know what a metaphor is.
I wonder if you really intended this to sound as sexist as it does. I bet they know what a metaphor is, and they also know how to communicate ideas in a way that the public understands, even if it's a misnomer.

Even if they are wrong, calling people stupid is a really awful way to go about sci-com and astronomy education.
Just call me "geck" because "zilla" is like a last name.