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The amazing floating dorsum of Mare Frigoris

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#1 doolsduck

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Posted 28 July 2020 - 07:23 AM

The amazing floating Dorsa of Mare Frigoris* Around a 60% illuminated Moon tonight and this clair obscur was very obvious in the 5mm eyepiece.  There are two parallel Dorsa but the darker one looks like a shadow of the other giving the appearance it is floating.  The effect was much stronger in the eyepiece.  Have a look for it around the same phase.  Orion 14” Intelliscope 5mm eyepiece IphoneSE Nightcap app  *not an actual floating dorsum. πŸ˜πŸ˜‰πŸ˜‰

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#2 John_Moore

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Posted 28 July 2020 - 09:40 AM

Nice catch!

 

Yeah, a wrinkle ridge (of many in the region): possibly related to formation of the Imbrium Basin...I'd guess. 

 

It's a pity that such features don't have official names, as it would make life much easier for finding them.

 

John Moore


Edited by John_Moore, 28 July 2020 - 09:41 AM.

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#3 doolsduck

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Posted 28 July 2020 - 05:01 PM

Thanks John.  



#4 doolsduck

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Posted 29 July 2020 - 12:34 AM

Hi John, I was googling dorsum (I probably shouldn't do that) and looked at the wiki entry.  Antonin Rukl named it Rukl 4  and Danny Caes calls it Dorsum Plato H (the wrinkle ridge north of Plato H) (the wrinkle ridge itself runs in Mare Frigoris).

 

In this link: https://the-moon.us/wiki/Dorsum there is an interesting link to a tirade by Danny Caes under Lunar catena which I just had to go to in click-bait fashion  lol.gif .  Here's the link.  https://the-moon.us/wiki/Catena

 

Suffice to say, after reading it I will stop calling them Dorsa or Dorsum and go back to wrinkle ridges so no one thinks I'm pretentious or pompous lol.gif lol.gif

cheers


Edited by doolsduck, 29 July 2020 - 12:36 AM.

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#5 payner

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Posted 15 August 2020 - 11:49 AM

Oh come on, it never hurt anyone grin.gif 

 

Great photo and am learning. Does anyone have the number in Rukl's atlas? I'll be looking for it later. Thank you. 



#6 doolsduck

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Posted 15 August 2020 - 05:27 PM

Thanks Payner. It is Rukl 4 apparently, that’s what the chap in the reply above your’s said too but he is often wrong. 😁

#7 payner

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Posted 15 August 2020 - 07:20 PM

I was talking about the map page number in the Rukl atlas. Anyway, I was being lazy and will find it.

 

Hey, don't tell on yourself. Then we'll all need to!


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