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Cosmic Challenge: Rupes Recta (Straight Wall), Huygen's Sword, Birt, and Rima Birt

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#1 PhilH

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Posted 01 June 2020 - 05:37 AM

What is your favorite lunar feature? Maybe it's the mighty craters Copernicus or Tycho. Or could it be the historic Sea of Tranquility? Perhaps you enjoy visiting the rugged southern highlands around Clavius, or the Apennine and Alp Mountains. If I had to come up with my favorite target, it would have to be a far more modest sight. I always enjoy looking for and at the Straight Wall.

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#2 RajG

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Posted 01 June 2020 - 09:36 AM

I too enjoy looking at Rupes Recta aka the Straight Wall aka Huygen's Sword. The first quarter moon shows lots of features/craters due to the shadows (lots of contrast), these get washed out on the full moon. Also it helps that the first quarter moon rises early enough that it is high in the sky at a reasonable time (not too late at night). 

 

Here's a pic from last weekend, using my AT 92. Single sooc jpg with an unsharp mask.

 

 

 

gallery_326571_13410_41153.jpg


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#3 Brian K.

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Posted 01 June 2020 - 06:50 PM

Phil,

 

Thanks for an excellent article. I plan on using the information you provided to image more features of our closest neighbor. Below are two images taken 5/30/2020.

 

Thanks again,

Brian K.

 

 

ES127ED-CF

iOptron CEM60

Canon 90D

ISO 800 (I could have gone lower)

1/800 SEC

 

Moon 8 Days Old Final
Moon 8 Days Old Cropped Final

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#4 Bill_H

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Posted 01 June 2020 - 09:47 PM

Thanks for the great article, Phil!

Huygens's Sword is one of my favs when viewing Luna.

I have your books Star Ware & Star Watch, and I'm wondering when Moon Watch is to be released?   ;>)

 

All the best,

Bill Hendricks

League City, TX


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#5 PhilH

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Posted 02 June 2020 - 03:07 AM

 

Phil,

 

Thanks for an excellent article. I plan on using the information you provided to image more features of our closest neighbor. Below are two images taken 5/30/2020.

 

Thanks again,

Brian K.

 

 

ES127ED-CF

iOptron CEM60

Canon 90D

ISO 800 (I could have gone lower)

1/800 SEC

 

Moon 8 Days Old Final
Moon 8 Days Old Cropped Final

 

Beautiful shots, Brian!  That close-up is terrific!


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#6 PhilH

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Posted 02 June 2020 - 03:09 AM

Thanks for the great article, Phil!

Huygens's Sword is one of my favs when viewing Luna.

I have your books Star Ware & Star Watch, and I'm wondering when Moon Watch is to be released?   ;>)

 

All the best,

Bill Hendricks

League City, TX

Thanks, Bill!  Not sure that Moon Watch is in my future (not a bad idea, tho), but I do discuss the Moon in some detail in Star Watch as well as my book Cosmic Challengewaytogo.gif


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#7 RyanSem

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Posted 02 June 2020 - 08:25 AM

Well that's neat! Never heard of it! Will be attempting this one soon. 


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#8 Special Ed

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Posted 02 June 2020 - 08:57 AM

Phil,

 

Rupes Recta is a great target and a good choice for one of your articles.  smile.gif   It's not only a striking sight for imagers like Brian (nice shot there) but also attracts sketchers.  If you search the Sketching forum you'll find several fine sketches of the Straight Wall there.

 

Here's my take (note, the sketch is mirror-reversed and cardinal directions are celestial--not Luna-based):

 

 https://www.cloudyni...recta-20170603/

 

With annotations:

 

 https://www.cloudyni...0603-annotated/


Edited by Special Ed, 02 June 2020 - 12:32 PM.

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#9 Dave Mitsky

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Posted 02 June 2020 - 02:22 PM

I took this hand-held afocal iPhone photograph on Saturday night at the Naylor Observatory using my 6" f/10 Celestron NexStar Evolution SCT.  While the transparency was rather good, the seeing was not.  Lunar north is up in the image.
 

https://www.nasa.gov...0209-rupes.html

Attached Thumbnails

  • Moon Celestron SCT May 30 Naylor IMG_5254 Processed Rotated Flipped Cropped CN.jpg

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#10 Dave Mitsky

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Posted 02 June 2020 - 02:36 PM

Here's a cropped version of that shot featuring Rupes Recta, Crater Birt, and Rima Birt.

Attached Thumbnails

  • Moon Celestron SCT May 30 Naylor IMG_5254 Processed Rotated Flipped Recropped Rupes Recta and Birt.jpg

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#11 BQ Octantis

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Posted 03 June 2020 - 10:58 PM

I just discovered this feature yesterday! I was out two nights ago shooting Lassell's Crater complex, and while processing yesterday, there it was in the scene:

 

gallery_273658_8467_43261.jpg

 

Rima Birt wasn't quite evident at first, but the dark patch at its end was quite visible even on the camera display—I thought it was a smudge until I noticed it moved with the scene.

 

Thanks for the lesson!

 

BQ


Edited by BQ Octantis, 04 June 2020 - 03:54 AM.

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#12 Epox75

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Posted 04 June 2020 - 03:43 AM

A few days ago, the 31 of May, I took a full disc picture of the Moon with my 6 inch f4 newtonian, I collected IR-RGB to make a color picture. Today I was reprocessing the IR channel alone while I notice this weird line. I was so curious about it that I even made a post: https://www.cloudyni...e-moon-surface/

 

So here's my humbly random contribution to the contest, the image is resampled 2x :
 
Moon 31052020 IR.jpg

 

Clear Skies, 

 

Andrea


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#13 rford322

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Posted 06 June 2020 - 02:27 PM

Like all of the above, I too, enjoy the straight wall, although to me it looks like an old flint lock rifle!

Flickr photo taken with a Mewlon 210:

https://flic.kr/p/2i9Lfjs


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#14 Dave Mitsky

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Posted 06 June 2020 - 03:50 PM

Like all of the above, I too, enjoy the straight wall, although to me it looks like an old flint lock rifle!

It does at that.



#15 SteveThornton1

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Posted 10 June 2020 - 10:53 AM

Here's my Rupes Recta that I took a couple weeks ago.  I imaged it with

my refurbished 9.25" SCT, a 2X Barlow and a ZWO ASI120MM camera.  I was able the image it with a 8/10 seeing and a high altitude moon

 
 
STRAIGHT WALL 2.jpg
[

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#16 LCWASTRO

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Posted 11 June 2020 - 03:59 AM

"i managed to image it with a high altitude moon"  LOL


Edited by LCWASTRO, 11 June 2020 - 03:59 AM.


#17 Sasa

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Posted 13 June 2020 - 11:34 AM

I was sketching this region couple of months ago. This is what came from observation through 82mm refractor. Without prior knowledge (my ignorance of Moon is quite large), I was able to pick up Rima Birt and I noticed that it bisected a vulcano dome (and I noticed possible second smaller dome attached to it):

 

Moon_20200401_RupesRecta.jpg


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#18 optinuke

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Posted 13 June 2020 - 04:20 PM

After sunrise on the morning of June 12th at about 7 AM PDT, I was able to just glimpse the bright Straight Wall at 200x with a 10" Newt.  My attempt the morning of the 13th was foiled by clouds. I had hoped to see the wall more easily since I think the terminator will have progressed too far by the AM of the 14th to have the wall illuminated (per the simulation on NASA's SVS Dial-a-Moon).

 

I always try to view this feature around First Quarter.  Thanks to all who have posted excellent images of it.


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#19 B 26354

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Posted 15 June 2020 - 09:19 PM

Full-resolution crop of a full-disk Moon shot: summer solstice evening, 2017.

 

Single exposure, Olympus OM-D E-M1, with an ES 102CF and ES 2X Focal Extender.

 

I love this phase of our Moon.

 

Rupes Recta

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#20 ValhallaObserver

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Posted 15 June 2020 - 11:33 PM

Amazing photo and a great object to view. Nice job on the photo and a good idea for a subject. I have seen this visually often and it always wows me. Being a newer older rediscovering astronomy love this sort of challenge.

 

ValhallaObserver


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#21 scottinash

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Posted 16 June 2020 - 06:46 AM

Excellent article as usual Phil!  Thank you for continuing to motivate and challenge!


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