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Chang'e 3 second lunar day of operations
Phil Stooke
post Jan 17 2014, 03:47 PM
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http://news.xinhuanet.com/photo/2014-01/17/c_126023483.htm

First astronomy data from the lander... I don't know anything about it.

Phil


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Cosmic Penguin
post Jan 18 2014, 07:36 AM
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Finally the panorama from the lander's MastCam has been found in print form (although still not quite available in full resolution - that might take a while to be released), although it was released as seven distinct photos so here's the panorama stitched by NSF member OzWill:


Attached thumbnail(s)
Attached Image
 


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Explorer1
post Jan 18 2014, 07:53 AM
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Fantastic! Apparently we shouldn't expect more color pictures from the lander, since the camera had no heater to survive the first lunar night (see Emily's blog post). If there's any gifs of the rover driving over the horizon they'll probably be b/w.
Next LROC imaging opportunity is Wednesday the 22nd; presumably the next chance to update the route map too.
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Paolo
post Jan 18 2014, 10:21 AM
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the panorama appears to contain a number of artifacts. notice in particular the vertical dark strips. I was also wondering what are the two yellowish areas on both sides of the gold-wrapped tank just to the left of the first tracks of Yutu. reflections from the thermal protection? the tank itself appears to be cut toward the top...
BTW, this should really belong to the first day of operation thread
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kenny
post Jan 18 2014, 12:48 PM
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The mission control team has been re-organised in anticipation of a year of operations, they now say.

Chang'e new missions - Xinhua
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4th rock from th...
post Jan 18 2014, 01:29 PM
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Yes, all the color images seem to be raws (if true they are quite good).
There are uncorrected gradients and some color areas at the left / right edges. And gamma/exposure seems to be way off.
The lunar surface is darker than that, but I understand that for media it may look better like this.


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wildespace
post Jan 18 2014, 06:56 PM
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My Photosynth panorma, from the individual images at http://www.chinanews.com/tp/hd2011/2014/01-18/293067.shtml

--> http://photosynth.net/view.aspx?cid=d9db94...30-43ec1a510dbc

And with auto-color correction in Photoshop:
http://photosynth.net/view.aspx?cid=3ee991...f8-a605fcdecf78


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kenny
post Jan 18 2014, 08:39 PM
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QUOTE (Paolo @ Jan 18 2014, 10:21 AM) *
I was also wondering what are the two yellowish areas on both sides of the gold-wrapped tank
just to the left of the first tracks of Yutu. reflections from the thermal protection? the tank itself appears to be cut toward the top...


I guess these are reflections off the 2 tanks, one yellow patch off each tank, but displaced to the left (westwards) on account of the sun angle. There were other bright
reflections on the ground underneath Yutu's panels in several of the detailed rover pics.

Yes, I agree the top of the left tank is cut off and the tubing crudely pasted on. To the left of that tank, part of one rock appears twice, so the pan in that area is a bit rough.
But a lovely scene overall, and a nice view of the pyramid rock on the edge of the big crater, which Yutu is now approaching.
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Phil Stooke
post Jan 18 2014, 11:08 PM
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Re: the cut-off tank.

The pan is 3 tiers of images high (and I don't know how many images long), but as the camera tilts to take each tier there will be a mismatch between the foreground (spacecraft components) and the background (lunar surface). When the images are pasted together you have a choice, align the spacecraft components or align the lunar surface components. You can't do both without very ingenious Curiosity MAHLI-self-portrait-style calisthenics. MAHLI could do it because it could be moved, this camera can't because it's fixed.

Phil


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wildespace
post Jan 19 2014, 09:44 AM
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The south-facing part of the lander panorama, with a boxed area indicating the field of view taken by a photo of Yutu we've seen earlier:
Attached Image
Attached Image


(Source for second image: http://news.xinhuanet.com/english/photo/20...33036156_10.htm )

Looks like the lander's panoramic camera had a good zoom. Shame the camera is no longer functional after the cold lunar night, or we could have gotten a more detailed panorama, or individual images, from the lander sad.gif

[Edit] Andrew Bodrov has created this amazing 360-degree panorama at http://www.360cities.net/image/lunar-panor...change-3-lander
Even the Earth, snapped by Chang'e 3 on a separate occasion, is there. ;-)


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Phil Stooke
post Jan 23 2014, 02:32 PM
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That's not a zoom, I think the full panorama did have that resolution everywhere.

Sun sets on the 25th. I am hoping we will get a summary of the activities during this lunar day soon, and we should also have another LRO image to look forward to.

Phil


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Cosmic Penguin
post Jan 24 2014, 03:23 AM
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Oh well the lander and rover are still alive and working - in fact late on January 22 (UTC) the rover performed direct data exchange to the lander via UHF - the first time two Chinese spacecraft communicate to each other on another planetary body. wink.gif

Source


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Liss
post Jan 24 2014, 07:33 AM
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QUOTE (Cosmic Penguin @ Jan 24 2014, 07:23 AM) *
Oh well the lander and rover are still alive and working - in fact late on January 22 (UTC) the rover performed direct data exchange to the lander via UHF...

Source

From the distance of 24 meters, is it correct?
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nprev
post Jan 24 2014, 12:49 PM
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UHF is line-of-sight only, so when/if Yutu goes over the horizon with respect to the lander that channel's gone. I forget how close that is (it's too early and I'm too lazy to do the math), but I wonder if that will restrict the radius of operations of the rover.


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SpaceListener
post Jan 24 2014, 03:03 PM
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About the Range of radio UHF

- Handheld radios generally will talk "radio-to-radio", "line-of-sight" up to 2 miles (3.2 kilometers). Once you start putting obstacles in between the radios you will shorten your range. Even the body fluid of the person wearing the radio on their hip will absorb some of the range. Higher wattage radios will have a slight increase in range and a significant increase in clarity of transmission on the outer fringes of your range.

- Mobile radios, such as those mounted in vehicles, will generally talk "radio-to-radio" 8-10 miles depending upon the obstacles and the terrain.

- Base stations will generally talk approx. 8-12 miles. Contrary to popular belief wattage does not determine distance. Antenna height and placement determines distance.

So the Yutu rover won't go so far from the station. So now we already know which interesting places that Yutu's rover can visit, so this is a good point cool.gif
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