Author Topic: TLP Project - Boulder Repellent  (Read 50914 times)

Geoff

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TLP Project - Boulder Repellent
« on: July 16, 2010, 06:53:33 pm »
Background: See this thread for background on this project: Moon Zoo Challenge

Location: Site: Small ray crater NE of Reiner Gamma: Marius Hills Original LROC Image centre at 57.5W, 7.9N.

Images: M111972680LE

Discovery: Anthony Cook (April 2010)

Description: This appears to be a flat featureless circular area at the floor of a boulder filled bright ray crater.

Interest: Why have the numerous boulders within this crater avoided filling the centre of this crater? Why is the central area so featureless – presumably it is younger than the main crater? Or is it that the solar altitude of 56° is preventing us from seeing craterlets on the floor of the flat patch. Is this central patch the reverse of a central peak, perhaps a central dimple and was filled with impact melt? Please look out for similar examples elsewhere on the Moon.


Small ray crater NE of Reiner Gamma
~
Closeup of ray crater centre


If you find something similar to the above please post it in this thread.
Don't forget a picture, the strip reference (LROC / NAC reference) and the approximate latitude and longitude.
Good luck!  :)
« Last Edit: August 23, 2010, 10:41:43 am by Geoff »

Tom128

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Re: TLP Project - Boulder Repellent
« Reply #1 on: July 18, 2010, 10:40:49 pm »


# ID: AMZ10038dn
# Latitude: 10.5948°
# Longitude: 311.415°

Tom128

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Re: TLP Project - Boulder Repellent
« Reply #2 on: July 19, 2010, 02:06:35 am »
Hello Geoff,

I spent a little while viewing the photo strip of the crater repellent example. That crater is absolutely stunning  :)

Wonder if it would make some sense to reanalyze the the ejecta around the crater in more detail for what may be mini  Lunar Swirls in the ray pattern?  It did seem to me that there was some similar type of patterns to the left of the crater.  If a strong magnetic field created the open area in its center there may be some merit to this line of speculation. Of course this assumes that Lunar Swirls are reacting to magnetic fields as you shared in your recent article as one of the possible explanations. The great thing about this crater is that there is a nice covering of ejecta surrounding it to look for patterns.


jules

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Re: TLP Project - Boulder Repellent
« Reply #3 on: July 19, 2010, 10:03:51 am »
Thanks for the tip Tom. Sounds like a good hunting ground.

Geoff

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Re: TLP Project - Boulder Repellent
« Reply #4 on: July 19, 2010, 10:23:08 am »
Hi Tom

I will be looking at this area soon. The area around Reiner Gamma has the largest lunar swirl on the near side so there may be "mini-swirls" around.

I don't think the swirls would have anything to do with the featureless centre area though.

Thomas J

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Re: TLP Project - Boulder Repellent
« Reply #5 on: July 19, 2010, 12:35:39 pm »
Thanks Tom, for the interesting insight.

Tom128

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Re: TLP Project - Boulder Repellent
« Reply #6 on: July 19, 2010, 03:26:56 pm »
Thanks  :)   One thought is that mini swirls, if they exist, may show up near the perimeter of crater impacts.  The suspect swirls in this photograph were not too far outside the perimeter on the left side, though there may be others.  The Lunar Swirl submission the other day was out near the edge of a very large crater (Aristarchus I think) as well.   Perhaps some crater configurations are more likely than others to exhibit such mini swirls.  Geoff, I did kind of wonder about my magnetic boulder idea when I started contemplating how that would have worked with all the boulders arranging themselves in some weird diamagnetic configuration. Now wouldn't that be a strong field  ::)   
« Last Edit: July 19, 2010, 03:31:02 pm by Tom128 »

Half65

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Re: TLP Project - Boulder Repellent
« Reply #7 on: July 23, 2010, 08:25:31 pm »


# ID: AMZ10009hb
# Latitude: 23.9447°
# Longitude: 312.929°
# Sun Angle: -83.59°
# Scale: 1.42 meters / pixel
# Zoom Level: 3

Half65

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Re: TLP Project - Boulder Repellent
« Reply #8 on: July 23, 2010, 08:26:50 pm »


# ID: AMZ10009hs
# Latitude: 23.6512°
# Longitude: 312.928°
# Sun Angle: -83.59°
# Scale: 1.42 meters / pixel
# Zoom Level: 3

Half65

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Re: TLP Project - Boulder Repellent
« Reply #9 on: July 26, 2010, 05:01:58 pm »


# ID: AMZ1001qx8
# Latitude: 49.224°
# Longitude: 3.82232°
# Sun Angle: -1.41°
# Scale: 0.52 meters / pixel
# Zoom Level: 3

Half65

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Re: TLP Project - Boulder Repellent
« Reply #10 on: July 27, 2010, 05:21:57 pm »


# ID: AMZ1002edo
# Latitude: -3.40337°
# Longitude: 337.263°
# Sun Angle: -86.69°
# Scale: 0.50 meters / pixel
# Zoom Level: 3

Half65

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Re: TLP Project - Boulder Repellent
« Reply #11 on: July 27, 2010, 06:09:07 pm »


# ID: AMZ1002j5k
# Latitude: 16.2563°
# Longitude: 46.4946°
# Sun Angle: -76.23°
# Scale: 0.50 meters / pixel
# Zoom Level: 3 

ElisabethB

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Re: TLP Project - Boulder Repellent
« Reply #12 on: July 28, 2010, 05:25:15 pm »

ID: AMZ4003k3q
Latitude: 21.74°
Longitude: 18.004°
Sun Angle: -74.43°
Scale: 0.71 meters / pixel
Zoom Level: 3   

Geoff

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Re: TLP Project - Boulder Repellent
« Reply #13 on: July 28, 2010, 05:32:26 pm »

ID: AMZ4003k3q
Latitude: 21.74°
Longitude: 18.004°
Sun Angle: -74.43°
Scale: 0.71 meters / pixel
Zoom Level: 3

Nice find Els!  This is in Bessel crater.

Aliko

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Re: TLP Project - Boulder Repellent
« Reply #14 on: August 05, 2010, 08:41:50 pm »

# ID: AMZ1002ld2
# Latitude: 22.3863°
# Longitude: 25.3411°