Crater Questions

[jules]

It does seem to have a particularly dark or shadowy floor - and also has some fresh ejecta to the top right. Be nice to have a closer look.

[IreneAnt]

Hi Geoff,

Jackson crater has a treasure trove of items we normally see in Aristarchus.

Here are a couple of pit-like formations near top left of photostrip http://wms.lroc.asu.edu/lroc/view_lroc/LRO-L-LROC-2-EDR-V1.0/M120928720RE



Not sure if we are seeing a little bridge-like separation between the two pits or not.

Hi Tom,

I've been looking at Jackson crater in my own research too. The floor of Jackson is believed to be covered by impact melts, so we would not expect these to be collapsed lava tubes. My instinct is to say that these are cooling cracks. It's true that sometimes it is very hard to see the correlation between a pit like this and a linear cooling feature. But usually, if you pan out,  you will see that the pit in question is part of a large-scale linear crack or crack system (as in this case).

[Tom128]

Hi Irene,

Yes, I can see a lot of cooling cracks in the area.  It is all very interesting 

Tom

[jaroslavp]

ID: AMZ10006f4
Latitude: -9.43362°
Longitude: 15.4286°

there is a strange bright line in the shadow of the big right crater.

[jaroslavp]

ID: AMZ1002jft
Latitude: 19.6912°
Longitude: 30.8597°

Top left crater looks unusual.

[ElisabethB]

weird crater. Any ideas ? 

AMZ40017tt
Latitude: -2.93°
Longitude: 336.239°
Sun Angle: -88.53°
Scale: 1.05 meters / pixel

[Geoff]

weird crater. Any ideas ? 

AMZ40017tt
Latitude: -2.93°
Longitude: 336.239°
Sun Angle: -88.53°
Scale: 1.05 meters / pixel

A bench crater maybe? They seem to come in all sorts of shapes and some do look quite strange.

[ElisabethB]

is this a bench crater or something else ?

AMZ4000bpp
Latitude: -3.29228°
Longitude: 342.487°
Sun Angle: -89.29°
Scale: 1.07 meters / pixel

[ElisabethB]

horseshoe crater 

AMZ40001cu
Latitude: 20.8287°
Longitude: 30.8301°
Sun Angle: -85.53°
Scale: 1.43 meters / pixel

[Geoff]

Interesting find Els. I wonder what caused part of the crater wall to collapse?

[jaroslavp]

ID: AMZ1001i8l
Latitude: 3.71611°
Longitude: 56.6751°


Its interesting. On one picture you see strange crater but in different light you see round crater.

M111219210LE
M119482862RE

[astrostu]

Okay, that's a bit trippy.  I knew that lighting could affect some things, but that's just wacked out.  I'm going to talk with the interface folks who are planning education content on the site and see if they want to use that as an example for why we are currently having you look at the same regions with different lighting (and may in the future limit it to the lighting where the sun is around 45° from the surface).  Thanks for posting!

[jaroslavp]

Okay, that's a bit trippy.  I knew that lighting could affect some things, but that's just wacked out.  I'm going to talk with the interface folks who are planning education content on the site and see if they want to use that as an example for why we are currently having you look at the same regions with different lighting (and may in the future limit it to the lighting where the sun is around 45° from the surface).  Thanks for posting!

Maybe the crater wasnt there before? When i look on the dark spot there is no sign of the crater we can see on the second picture. And maybe the sun 45° from the surface makes many things invisible that you can see on the dark picture forexample freswhite and darkhaloed craters.

[jules]

That's really odd! Just tried to find yet another view - haven't yet.

[jaroslavp]

I have one silly idea. The dark spot is Meteoroid before impact or cloud from impact. 
But in reality the walls of the crater are probably hidden by the black and white material.