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Outrageous Alpetragius

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#1 doolsduck

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Posted 27 August 2020 - 06:16 AM

One of my favourite craters is the 39km Alpetragius Crater.  Here it is seen with its disproportionately large central dome at about the 10 o’clock position from Rupes Recta.  The central dome may have been enlarged by volcanic activity.  This is a single exposure IphoneSE image recorded with a 5mm eyepiece on an Orion Intelliscope 14”

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#2 flt158

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Posted 27 August 2020 - 08:26 AM

I see you have Rima Birt here too, Doolsduck!

 

Best regards, 

 

Aubrey. 



#3 doolsduck

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Posted 27 August 2020 - 02:58 PM

Yes! It showed up rather well last night! Cheers

#4 John_Moore

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Posted 27 August 2020 - 04:00 PM

Aubrey points out a particular nice feature that is generally overlooked due to the magnificence of 'The Wall'.

 

Rilles usually develop from a main source of lava having a larger 'head-like'' structure at the beginning, but then peters out to smaller, collapsed tube-like features at the end. I wonder, is Rima Birt actually two separate rills that formed directionally opposite to each other, but, perhaps, with a common, volcanic collapse structure underlying them both?

 

John Moore

 

RimaBirt
 
RimaBirt2

Edited by John_Moore, 27 August 2020 - 07:29 PM.

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#5 doolsduck

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Posted 27 August 2020 - 04:30 PM

Thanks for the extra information John. Now that you mention the heads, I can also see the domes Birt 1 and Birt 2 there too. This exposure is better than I thought 😊
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#6 John_Moore

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Posted 27 August 2020 - 05:54 PM

This paper by Guido Santacana, Eric Douglass, Daniel del Valle, Raffaello Lena and Piergiovanni Salimbeni might also be of interest re: the possible domes mentioned.

 

John Moore


Edited by John_Moore, 27 August 2020 - 07:52 PM.

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#7 doolsduck

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Posted 27 August 2020 - 06:05 PM

Thanks John. I gave a connection problem to that link but I think it is my security settings here which I will try and get around. I’ll see if I can crop the original and highlight the domes but this link highlights the two I think I can see ... http://www.chamaeleo...segment-09b.htm
cheers
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#8 John_Moore

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Posted 27 August 2020 - 06:32 PM

Cheers, doolsduck.

 

The ChamÄleon Namibia Observatory and colleagues is/are extraordinary, and sometimes, in my opinion, overlooked.

 

I think you've pinpointed the two domes in this image from your resource correctly, so apologies if I've got them wrong.  

 

John


Edited by John_Moore, 27 August 2020 - 07:57 PM.

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#9 doolsduck

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Posted 27 August 2020 - 07:44 PM

Cheers, doolsduck.

The ChamÄleon Namibia Observatory and colleagues is/are extraordinary, and sometimes, in my opinion, overlooked.

I think you've pinpointed the two domes in this image from your resource, so apologies if I've got them wrong.

John


Yes John that’s the two I can see in my image
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#10 doolsduck

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Posted 27 August 2020 - 08:39 PM

Here’s the crop of my image labelled with what I think I can see

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#11 doolsduck

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Posted 29 August 2020 - 11:43 PM

Since looking closer at this set of images I took, I’ve started to fall into the rabbit hole of Lunar volcanism.  I found some details on the Lassell massif and the area around it.  I’ve annotated Lassell D (2km), Lassell J (3km) and circled is a Lunar cone.  I don’t know if they will appear in this uploaded image.  The cone in question has a photo on page 5 of this PDF http://www.chamaeleo...of the moon.pdf

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#12 John_Moore

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Posted 30 August 2020 - 11:46 AM

I'm amazed that you could spot the cone, doolsduck, at all, but it is a very nice dark-looking one from afar. Below, the LRO NAC camera took an extreme close-up view of it in the general area (incredible zooming in on it is also possible from this link).

 

John Moore

 

Image credit: LRO

 

LasselCone

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#13 doolsduck

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Posted 30 August 2020 - 03:51 PM

I'm amazed that you could spot the cone, doolsduck, at all, but it is a very nice dark-looking one from afar. Below, the LRO NAC camera took an extreme close-up view of it in the general area (incredible zooming in on it is also possible from this link).

John Moore

Image credit: LRO

Thanks John. I does appear more contrasted in the first wide angle shot I posted now you mention it.(the higher res one). Cheers M
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#14 John_Moore

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Posted 31 August 2020 - 12:48 PM

Oops, sorry for the confusion, but I wasn't referring, or criticising, to your original being too contrast (too dark etc.,), but rather that the cone itself looks really dark-ish to the surrounding terrain when seen from just a slightly closer view (the below LRO shot shows it up nicely). Btw, there's another dark one just south of it here, too  - it's about 140 km away (and, again, the LRO site allows extreme zooming).

 

John

 

Image credit: LRO

 

LasselCone DarkView
 
ConesTwoCorrect
 

 

 


Edited by John_Moore, 01 September 2020 - 04:23 AM.

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#15 doolsduck

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Posted 31 August 2020 - 04:44 PM


Oops, sorry for the confusion, but I wasn't referring to your original being too contrast (too dark etc.,), but rather that the cone itself looks really dark-ish to the surrounding terrain when seen from just a slightly closer view (the below LRO shot shows it up nicely). Btw, there's another dark one just south of it here, too - it's about 140 km away (and, again, the LRO site allows extreme zooming).

John

Image credit: LRO









I got what you meant John don’t be sorry. I can also see the ‘other cone’ in my first image. Thanks for the extra details. Cheers
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