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Lunar Valley Furrow

Astrophotography
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#1 Sky King

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Posted 25 October 2021 - 05:54 PM

Here are some recent images of the southeastern moon. Here are my images of the "furrow," I circled it. LROC didn't shed any light on this that I could see. To me good imaging is not as important as knowing about what's been imaged. Anyone know this area? Thanks!

 

22 25 36
 
22 34 00
 
22 35 34
 
23 56 03

Edited by Sky King, 25 October 2021 - 08:58 PM.

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#2 BillHarris

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Posted 25 October 2021 - 06:48 PM

Vallis Rheita.
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#3 John_Moore

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Posted 25 October 2021 - 07:07 PM

Great views, Sky King.

 

The Vallis Rheita (as Bill correctly points out) has for a long time been controversial. Why? Because if you look at it from an overhead perspective view (below), it looks like it is a combination of two separate events.

 

The north-western sector looks thicker in its width to the thinner south-eastern part, and note the mis-alignment of both. A suggestion: that two separate events may be responsible for this feature.

 

John Moore

 

VallisRheitaDivide

Edited by John_Moore, 25 October 2021 - 07:14 PM.

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#4 Sky King

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Posted 25 October 2021 - 07:12 PM

Vallis Rheita.

Great! Wiki says "it is located in the southeastern quadrant, and is oriented radially to Mare Nectaris. This valley appears to share a common origin with the Vallis Snellius to the northeast, as both are oriented radially with Mare Nectaris."  I edited the original post as you solved the mystery. Thanks! 


Edited by Sky King, 25 October 2021 - 07:28 PM.

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#5 Sky King

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Posted 25 October 2021 - 07:20 PM

Great views, Sky King.

 

The Vallis Rheita (as Bill correctly points out) has for a long time been controversial. Why? Because if you look at it from an overhead perspective view (below), it looks like it is a combination of two separate events.

 

The north-western sector looks thicker in its width to the thinner south-eastern part, and note the mis-alignment of both. 

 

John Moore

 

Interesting!  At 276 miles, it is the longest valley on the Moon. In "The Modern Moon" by Wood,  Hartman is credited with proposing "the change in direction and shape of the Rheita-Mallet valleys must be due to some peculiarity of the distribution of Nectaris ejecta." Controversial for sure. Thanks for posting!


Edited by Sky King, 25 October 2021 - 07:41 PM.

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#6 John_Moore

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Posted 25 October 2021 - 07:44 PM

Interesting!   At 276 miles, it is the longest valley on the Moon.

No, the most longest valley on the near side of the Moon is said to be Vallis Snellius -- having a diameter of ~ 640 km as opposed to Rheita of ~ 509 km.

 

John

 

Vallis Snellius

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#7 Sky King

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Posted 26 October 2021 - 03:51 PM

Here are two more images from this session. The Mare Crisium region was from a ASI174mm and the Apennine Mountain area was with a ASI183mm camera. The Vallis Rheita images posted above were from the ASI183mm-cooled, except for the bottom image which was from the ASI174mm-not cooled. Crisium needs rotated but doesn't show as much when corrected for some reason. I was having a duel of the ASI cameras.

 

00 06 57
 
21 57 24

Edited by Sky King, 26 October 2021 - 04:17 PM.

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#8 BillHarris

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Posted 29 October 2021 - 10:24 AM

Great views, Sky King.

The Vallis Rheita (as Bill correctly points out) has for a long time been controversial. Why? Because if you look at it from an overhead perspective view (below), it looks like it is a combination of two separate events.

The north-western sector looks thicker in its width to the thinner south-eastern part, and note the mis-alignment of both. A suggestion: that two separate events may be responsible for this feature.

John Moore

And more mysterious is that the two segments of the feature show such a close trend. IMO, too close for coincidence (nature abhors coincidence). My take is two closely-aligned ejecta streams from the same impact event.
Even when we get boots on the ground we may never have an answer.
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#9 Tom Barnacle

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Posted 30 October 2021 - 04:51 AM

The northern more prominent section of Vallis Rheita is a secondary crater chain from the Imbrium Basin which was formed by a low angle impact from the NW, sending much of its ejecta downrange towards the SW. Vallis Rheita is not radial to Nectaris but is downrange from Imbrium. In this respect it is probably the one of the most distal elements of the Imbrium Sculpture.

 

The narrower southern component is more radial to the Nectaris basin and appears to represent a secondary chain from that basin forming impact event.

 

Two events producing 2 crater chains I suspect.


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