Author Topic: Crater chains  (Read 76123 times)

IreneAnt

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Re: Crater chains
« Reply #30 on: May 27, 2010, 12:12:54 am »

ID: AMZ4003mdb
Latitude: -9.02132°
Longitude: 15.5141°

Maybe? :-\ ;D

Wow, Caro!
Now, those are some amazing crater chains, most probably related to an ejecta deposit, just off the lower right corner of the image. I particularly love the fact that, in many cases, you can see the pit from the impactor and a whispy "V" pointing away from the pit. Classic crater chain behaviour!

Caro

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Re: Crater chains
« Reply #31 on: May 27, 2010, 06:57:31 am »
Thanks Irene. :D Maybe now I'll have more idea of what I should be looking for.

DJ_59

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Re: Crater chains
« Reply #32 on: May 28, 2010, 09:55:06 pm »
Hello, all.

I'm still early in the whole "figuring everything out" process, but I THINK I found a crater chain.  Can someone verify this?  If you go from the center of the image to the left, about an inch and a half from the left edge you'll run into the middle of a chain of five going diagonally upward toward the corner.  The more I look at this image the more I see other possible chains, but that's the one that has me convinced.  So... is it?


jules

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Re: Crater chains
« Reply #33 on: May 28, 2010, 10:39:19 pm »
We are having a bit of trouble with crater chains!! The tutorial images don't look like what most of us expected and I think true crater chains are quite rare. I see strings of 4,5 6 or more craters in many images but have stopped marking them as chains. We really need a few more examples but meanwhile there are some examples somewhere in this thread......here and here.

I am hoping a team member will look in the Team Area soon and give us some more clues.

Tom128

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Re: Crater chains
« Reply #34 on: May 28, 2010, 11:02:42 pm »
Maybe these are crater chains.



 ID: AMZ1000fd0
 Latitude: 20.0146°
 Longitude: 30.497°

« Last Edit: May 28, 2010, 11:04:14 pm by Tom128 »

IreneAnt

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Re: Crater chains
« Reply #35 on: May 30, 2010, 02:09:57 am »
Hello, all.

I'm still early in the whole "figuring everything out" process, but I THINK I found a crater chain.  Can someone verify this?  If you go from the center of the image to the left, about an inch and a half from the left edge you'll run into the middle of a chain of five going diagonally upward toward the corner.  The more I look at this image the more I see other possible chains, but that's the one that has me convinced.  So... is it?



Hello DJ_59, I think I see what you mean. Five craters in a very straight line...

Crater chains can look like this, when the craters are spaced enough apart that their ejecta doesn't interfere. But here, you will notice that the craters closer to the bottom appear more degraded than the upper craters (their edges aren't as sharp, their depth more subdued). In the absence of other evidence, this suggests that these craters were created at different times, and so aren't a chain. Our eye-brain system is very good at finding patters (which is why the Zooniverse was created  :D), but in this case, I think it's a false positive.

That said, thanks for posting this. It's a great image for this discussion.

DJ_59

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Re: Crater chains
« Reply #36 on: May 30, 2010, 05:22:23 am »

Quote

Hello DJ_59, I think I see what you mean. Five craters in a very straight line...

Crater chains can look like this, when the craters are spaced enough apart that their ejecta doesn't interfere. But here, you will notice that the craters closer to the bottom appear more degraded than the upper craters (their edges aren't as sharp, their depth more subdued). In the absence of other evidence, this suggests that these craters were created at different times, and so aren't a chain. Our eye-brain system is very good at finding patters (which is why the Zooniverse was created  :D), but in this case, I think it's a false positive.

That said, thanks for posting this. It's a great image for this discussion.

Thank you, Irene.  That helps me a lot.  I did notice that but I wasn't certain it was about erosion.  I thought it might be a lighting and angle vision.  I think I have completely discarded the rule that works so well for me in everything else in life, which is "go with your first instinct".  My first instinct was that they looked different but perfectly aligned.  I think I need to let a little of that "first instinct" policy back in around here.


weezerd

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Re: Crater chains
« Reply #37 on: June 02, 2010, 03:49:03 pm »
If this isn't a crater chain down the left side, then I'm a dead man's chest!



000022216
Longitude: 15.2984
Latitude: -8.8888

...gambler's latitude too!! :D

jules

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Re: Crater chains
« Reply #38 on: June 02, 2010, 08:33:25 pm »
Top left. Maybe?

# ID: AMZ40006yw
# Latitude: 1.48273°
# Longitude: 23.5839°

Caro

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Re: Crater chains
« Reply #39 on: June 04, 2010, 10:57:39 am »

ID: AMZ4000mmj
Latitude: 1.82082°
Longitude: 23.2839°

Not sure what to make of this so ... crater chain?  :-\ :D



weezerd

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Re: Crater chains
« Reply #40 on: June 04, 2010, 11:30:42 am »
No Caro, that's a tadpole!

jules

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Re: Crater chains
« Reply #41 on: June 05, 2010, 03:00:42 pm »
Whatever it is that's a great picture! :D

DJ_59

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Re: Crater chains
« Reply #42 on: June 05, 2010, 11:45:02 pm »

A confused Venus Fly Trap on the Moon by mistake? 

The caption should be "FEEEEED me, Seymore!"


Thornius

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Re: Crater chains
« Reply #43 on: June 06, 2010, 02:29:05 am »

ID: AMZ4000mmj
Latitude: 1.82082°
Longitude: 23.2839°

Not sure what to make of this so ... crater chain?  :-\ :D

Mega-Snake Fossil.  Looks like a giant rattler to me.

IreneAnt

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Re: Crater chains
« Reply #44 on: June 07, 2010, 05:59:45 pm »

ID: AMZ4000mmj
Latitude: 1.82082°
Longitude: 23.2839°

Not sure what to make of this so ... crater chain?  :-\ :D

This looks like it might be the result of an impact that came in on such a low angle that it bounced a few times before plowing into the ground. If that's not it, I don't know what it is. It is very weird-looking....