Author Topic: TLP Project - Lava Tube Sky Lights  (Read 37362 times)

Geoff

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TLP Project - Lava Tube Sky Lights
« on: July 16, 2010, 06:49:28 pm »
Background: See this thread for background on this project: Moon Zoo Challenge

Location: Site 1: Marius Hills (56.8W, ~14N).
Site 2: Mare Ingenii (166.06E, 35.95S).

Images: Site 1: NAC M114328462RE. Site 2: NAC M128202846LE.

Discovery: Site 1: JAXA Kaguyateam. Site 2: (LRO team?)

Description: Appears as a small crater, but could be irregular and non-circular. Unlike a crater though it is very deep and will be nearly completely shadow filled, even when there is little shadow elsewhere in nearby craters. On the interior edges there maybe signs of rock debris?

Interest: A lava tube is present somewhere beneath the surface and something has made part of the ceiling collapse. The lava tube may have contained an accumulation of volcanic gas seepage. Or it could be a conduit through which deep seated gas pockets could be released periodically during moonquakes. This could in theory kick up some dust or lead to gas ionisation in sunlight. So far, only two skylights are known on the lunar surface. A good excuse to monitor such areas from orbit and from Earth for TLPs.

Marius Hills Lava Tube Sky Light –65 metres wide
~ Mare Ingenii Tube Sky Light –130 metres wide

Further information and examples here and check out the earlier JAXA Kaguya observations.

Please post any lava tube skylights you find in this thread. Don't forget a picture, the strip reference (LROC / NAC reference) and the approximate latitude and longitude.
Good luck! :)

Tom128 put together some more information about lava tube skylights on Earth here.
« Last Edit: August 23, 2010, 10:42:49 am by Geoff »

ElisabethB

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Re: TLP Project - Lava Tube Sky Lights
« Reply #1 on: July 17, 2010, 10:08:57 am »
could this be one ?

ID: AMZ4002jmi
Latitude: 23.8754°
Longitude: 312.383°
Sun Angle: -10.64°
Scale: 0.52 meters / pixel

Tom128

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Re: TLP Project - Lava Tube Sky Lights
« Reply #2 on: July 18, 2010, 02:47:11 pm »


# ID: AMZ1001xrv
# Latitude: 23.8747°
# Longitude: 312.311°

Geoff

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Re: TLP Project - Lava Tube Sky Lights
« Reply #3 on: July 20, 2010, 06:34:48 pm »


# ID: AMZ1001xrv
# Latitude: 23.8747°
# Longitude: 312.311°

Tom

This looks interesting, almost as if there is a lava tube beneath the surface running left to right and the roof has caved in in three places. Hopefully one of the experts will take a look and comment.

Aliko

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Re: TLP Project - Lava Tube Sky Lights
« Reply #4 on: July 20, 2010, 10:54:15 pm »
Another one and also from Aristarchus

# ID: AMZ1001weu
# Latitude: 23.4706°
# Longitude: 312.419°

Half65

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Re: TLP Project - Lava Tube Sky Lights
« Reply #5 on: July 22, 2010, 05:38:52 pm »


# ID: AMZ10004ov
# Latitude: -0.33485°
# Longitude: 23.3799°
# Sun Angle: -89.63°
# Scale: 1.23 meters / pixel
# Zoom Level: 3

Half65

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Re: TLP Project - Lava Tube Sky Lights
« Reply #6 on: July 22, 2010, 06:21:06 pm »






# ID: AMZ20007by
# Latitude: 15.8907°
# Longitude: 46.5506°
# Sun Angle: -76.23°
# Scale: 2.00 meters / pixel
# Zoom Level: 2

Half65

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Re: TLP Project - Lava Tube Sky Lights
« Reply #7 on: July 22, 2010, 07:59:56 pm »


# ID: AMZ1000zb1
# Latitude: 24.2624°
# Longitude: 312.727°
# Sun Angle: -69.63°
# Scale: 1.43 meters / pixel
# Zoom Level: 3

jules

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Re: TLP Project - Lava Tube Sky Lights
« Reply #8 on: July 22, 2010, 09:09:58 pm »
Interesting. I wonder what these "holes" in the impact melt are?

Tom128

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Re: TLP Project - Lava Tube Sky Lights
« Reply #9 on: July 23, 2010, 12:12:28 am »
Hi Geoff,

I looked at this photostrip: Marius Hills  13.92 / 303.21                M114328462RE        65 metres wide.

http://wms.lroc.asu.edu/lroc/view_lroc/LRO-L-LROC-2-EDR-V1.0/M114328462RE

Found the big one you mentioned and two others that are wannabies.



Interesting that there is very little ejecta around it which is a tell.





The second one most likely is a crater shadow as the first photo shadowing is quite different.  Also there is quite of bit of ejecta around the second crater in the photo.




I find the third target very interesting with its burnt looking dark material and very dark- smaller holes in the dark material (probably shadow). It does have a lot of ejecta to the right (not shown) going in one direction.  I am sure all these have been looked at in great detail.


The first photo is on left of strip about half way down. The third photo is on left above the first. The second photo is on left of strip near the top.






 
« Last Edit: July 23, 2010, 01:12:47 am by Tom128 »

Tom128

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Re: TLP Project - Lava Tube Sky Lights
« Reply #10 on: July 23, 2010, 05:03:34 am »
This dark area is on the NAC photo strip about half way down on right side at highest resolution.

http://wms.lroc.asu.edu/lroc/view_lroc/LRO-L-LROC-2-EDR-V1.0/M109548636LE


Geoff

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Re: TLP Project - Lava Tube Sky Lights
« Reply #11 on: July 23, 2010, 10:54:20 am »
Hi Tom

I've been exploring the same strip and found some dark holes, probably not Sky Lights but you never know!

These are from strip: M109548636LE


Position in strip: Right-hand side, at the bottom.


Position in strip: Right-hand side, near the top.

The hole in the centre of the image looks interesting.
« Last Edit: November 17, 2010, 04:26:31 pm by Geoff »

Half65

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Re: TLP Project - Lava Tube Sky Lights
« Reply #12 on: July 23, 2010, 02:12:36 pm »
Could be bottom right



# ID: AMZ1000yti
# Latitude: 22.9397°
# Longitude: 312.579°
# Sun Angle: -69.63°
# Scale: 1.43 meters / pixel
# Zoom Level: 3

Half65

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Re: TLP Project - Lava Tube Sky Lights
« Reply #13 on: July 23, 2010, 02:17:15 pm »
Top center right could be. There is a black hole.



# ID: AMZ1000ysj
# Latitude: 23.5488°
# Longitude: 312.582°
# Sun Angle: -69.63°
# Scale: 1.43 meters / pixel
# Zoom Level: 3 

Half65

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Re: TLP Project - Lava Tube Sky Lights
« Reply #14 on: July 23, 2010, 02:34:17 pm »


# ID: AMZ1000ywh
# Latitude: 23.5488°
# Longitude: 312.61°
# Sun Angle: -69.63°
# Scale: 1.43 meters / pixel
# Zoom Level: 3