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Yutu Route Map
Phil Stooke
post Dec 28 2013, 09:52 PM
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This is a very tentative map update. We have no images to help with the current position, but there is a report that the rover is 40 m south of the lander and 'a little bit left' which I am interpreting to mean left on a north-up map, not left as the rover drove.

So... position is very tentative and the shape of the route unknown, and even the date of the drive is uncertain. So all this may be changed later. But for now it's the best we can do.

Phil

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vikingmars
post Dec 30 2013, 11:36 PM
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QUOTE (Phil Stooke @ Dec 28 2013, 10:52 PM) *
So... position is very tentative and the shape of the route unknown, and even the date of the drive is uncertain. So all this may be changed later. But for now it's the best we can do. Phil

Great : you did it quite good Phil ! Here is the LRO image : congratulations to you again for your new Yu-Tu positioning close to the spot on the LRO image (small arrow) with almost no data at all ...and Happy NEW YEAR's Eve ! smile.gif
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djellison
post Dec 31 2013, 02:44 AM
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QUOTE (vikingmars @ Dec 30 2013, 03:36 PM) *
Here is the LRO image


HERE is the LRO Image.
http://lroc.sese.asu.edu/news/index.php?/a...From-Above.html

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Phil Stooke
post Dec 31 2013, 02:47 AM
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Merci! Here's another update including a sketch of the lander - though I'm not sure of the exact dimensions of the lander... and corrected to use the LRO position for Yutu.

Since we will presumably never have daily status reports, this map will always be a work in progress, updated from every scrap of information we get.

Phil

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Explorer1
post Dec 31 2013, 03:32 AM
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LRO can make up for the lack of reports quite easily, given the regular flyover schedule. I expect you'll miss learning any creative names they give to sites and targets more Phil (if they even have more than numbers)!
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Phil Stooke
post Dec 31 2013, 04:00 AM
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I'm hoping for a few names!

Phil



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Phil Stooke
post Jan 15 2014, 12:12 AM
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Map update to 14 January - I don't know the date of the drive or the path, so this is conjectural, but the position should be OK. Since the last map I have corrected the size of the lander.

(EDIT - replaced with an update with the latest position, but I'm leaving it undated until I know more)

Phil

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Liss
post Jan 19 2014, 08:32 PM
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In a Chinese news report from Jan 14 current position was pictured as -32.61 meters (south) and -24.63 meters (west). Can't say what frame is in use -- either from lander or from the X point at the end of rails. The third number (27.17) relates to Yutu's attitude. The one to the right (129.23) is the Sun azimuth. There's also the fifth number outside of this frame -- Sun elevation (34.42 or so). Hope this helps to check/correct Phil's map.
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Liss
post Jan 19 2014, 10:45 PM
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Similar data were found for points A (15 Dec 2013) and E (22 Dec 2013). With reservations about guessing blurred figures, here are these:

Point A -- 9.03 N, 1.55 E, Az = -171.08
Point E -- 30.97 S, 0.64 W, Az = 174.80

As LRO found Yutu to rest some 30-31 meters from CE3, we should believe positions are consistently measured from CE3.
Jia Yang's 'more than 40 meters' may be from point X -- or even along the track.
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Phil Stooke
post Jan 19 2014, 11:42 PM
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Interesting! Here is my map with a 10 m grid superimposed and aligned with the lander. The coordinates match the Jan. 14 position well, except 'point E' refers to the point south of my E.

Phil

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Liss
post Jan 20 2014, 01:13 AM
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Phil, you are right and I was wrong!
What I referred to as point E was in fact point of night sleep, recorded on December 26 and January 8.
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Phil Stooke
post Feb 23 2014, 04:20 PM
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As you know there has been very little information since mid-January. I have updated this map to suggest where we might be based on three very uncertain thoughts.

1. The direction the lander is viewed from in the most recent image.
2. A statement that the distance driven was 'over 100 m' which I interpret as 'only slightly over 100 m'.
3. An earlier statement that the big rock was a target for the rover instruments.

Phil

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elakdawalla
post Feb 23 2014, 04:31 PM
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I'm sort of surprised we haven't seen any further photos from LROC that would help localize the rover.


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Phil Stooke
post Feb 23 2014, 05:34 PM
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Yes, we are overdue - some were expected during day 2 but have not been released (if taken). I could really use an LROC-NAC about now!

Phil



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elakdawalla
post Feb 24 2014, 05:32 PM
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Since it took me a while to dig it up, I'll post in here a link to Mark Robinson's LPSC abstract on LROC imaging of the Chang'e 3 landing site, and a clip of the table of information on planned images:
CODE
Image    Sample    Line    Incidence    Emission    Phase    Scale    (m/px)    Date
M102285549LE    2645    48154    -81    2    82    1.7    2009-07-15
M181302794LE    2478    39772    -72    2    74    1.6    2012-01-15
M183661683LE    4784    22098    -54    0    54    1.6    2012-02-12
M1116664800RE    3639    6405    -44    2    44    1.5    2013-02-28
M1127248516RE    2283    33974    -76    1    75    1.5    2013-06-30
M1129602407LE    2846    31480    -59    2    60    1.6    2013-07-27
M1142554338LE    4549    15684    -74    33    106    1.8    2013-12-24
M1142568554LE    4184    20330    -75    17    92    1.6    2013-12-24
M1142582775RE    1550    20621    -77    2    75    1.5    2013-12-25
M1142596997RE    845    20800    -78    20    58    1.6    2013-12-25
M1142625444RE    1477    16571    -81    48    36    2.1    2013-12-25
M1142682346RE    1112    10474    -87    72    21    3.8    2013-12-26
Table 1. Summary of LROC NAC images and pixel coordinates of Chang'e 3 lander, entries in italics acquired after
landing. Future imaging opportunities occur 2014-01-22, 2014-02-19, 2014-03-19. Negative incidence angle indicates
Sun from the west.


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