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May's Apparition of the Lunar X, 5/18/21

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#1 Dave Mitsky

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Posted 17 May 2021 - 02:41 PM

The Lunar X (the Purbach or Werner Cross), an X-shaped illumination effect involving various rims and ridges between the craters La Caille, Blanchinus, and Purbach, is predicted to be visible at 7:41 p.m. EDT (23:41 UT) on Tuesday night.

 

http://astrogeo.ca/w...dusk-with-mars/

 

https://www.cloudyni...abet-soup-r3128


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#2 paul hart

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Posted 17 May 2021 - 09:02 PM

Thanks, If it's clear, I will watch it.


Edited by paul hart, 17 May 2021 - 09:03 PM.


#3 NYJohn S

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Posted 18 May 2021 - 09:56 AM

Thanks for posting Dave! I was out last night for the first time in a while and was wondering if it was getting close to the phase when Lunar X is visible. Came here to check.



#4 Dave Mitsky

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Posted 18 May 2021 - 01:23 PM

https://www.ibtimes....tonight-3201737


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#5 Dave Mitsky

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Posted 18 May 2021 - 05:06 PM

I've been observing the 41%-illuminated Moon from my driveway using a now ancient 6" f/8 Orion SkyQuest XT6 Dob, an 8-24mm Tele Vue Click Stop zoom eyepiece, and a 40mm Celestron Plössl.  At the moment, the sky is too bright to see the area near the terminator clearly.



#6 Dave Mitsky

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Posted 18 May 2021 - 06:43 PM

I can see the Lunar X now.


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#7 Dave Mitsky

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Posted 18 May 2021 - 06:50 PM

The Lunar V is visible too.


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#8 Dave Mitsky

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Posted 18 May 2021 - 07:44 PM

I took the following hand-held afocal iPhone shots of the Lunar X and Lunar V using the 6" f/8 Orion SkyQuest XT6 Dob and a 30mm Celestron Ultima eyepiece.

Attached Thumbnails

  • Lunar X Orion XT6 30mm Ultima 5-18-21 IMG_4057 Reprocessed Rotated Cropped Resized 900.jpg

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#9 Dave Mitsky

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Posted 18 May 2021 - 07:49 PM

(continued)

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  • Lunar X Orion XT6 30mm Ultima 5-18-21 IMG_4059 Reprocessed Rotated Cropped Resized 900.jpg

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#10 Dave Mitsky

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Posted 18 May 2021 - 07:55 PM

(continued)

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  • Lunar X Orion XT6 30mm Ultima 5-18-21 IMG_4061 Reprocessed Rotated Cropped Resized 900 Labeled.jpg

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#11 Kutno

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Posted 18 May 2021 - 09:12 PM

Lookin at it right now, Dave; along with Aries Hoofprint and Rima Hyginus.


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#12 Dave Mitsky

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Posted 18 May 2021 - 09:33 PM

The Lunar X and Lunar V are easily visible using Canon IS 15x50s.


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#13 NYJohn S

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Posted 19 May 2021 - 08:19 AM

I caught them too. Glad you posted as this was my first time seeing them. Is that the hoofprint next to V?

Attached Thumbnails

  • Moon 05_18_21 1500px X & V Adj1 sm-9087.jpg

Edited by NYJohn S, 19 May 2021 - 08:20 AM.

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#14 Kutno

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Posted 19 May 2021 - 10:55 AM

I caught them too. Glad you posted as this was my first time seeing them. Is that the hoofprint next to V?

Yes; the Hoofprint and the Rima, as well.


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#15 Kutno

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Posted 19 May 2021 - 11:46 AM

I've been observing the 41%-illuminated Moon from my driveway using a now ancient 6" f/8 Orion SkyQuest XT6 Dob, an 8-24mm Tele Vue Click Stop zoom eyepiece, and a 40mm Celestron Plössl.  At the moment, the sky is too bright to see the area near the terminator clearly.

I bought my XT6i Dob thirteen years ago and though it may be getting on in years, it is not behaving that ancient when it comes to delivering the goods.  I have always said that one could be very happy to have such an instrument, if one could not afford something more powerful or finer.  The XT6i was used last night to acquire the X, the V, the Hoofprint, Rima, and other lunar targets, with a pair of 15mm Tele Vue Plossls sitting in a Big Easy binoviewer.       


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#16 Kutno

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Posted 19 May 2021 - 12:42 PM

A couple of more things to share about last night, Dave:

 

We have been blessed with some great humidity free weather this week, in our neck of the woods, as the Moon has been climbing higher in the sky each successive evening.  A couple of nights ago, I was pushing the aperture limits of a Celestron Omni XLT 102 achromat to acquire both the Moon and Mercury in the western evening sky.  Physical issues have prevented me from taking out any of the Dobs for some time now, but I decided to test my skeletal-muscular system by dragging out the XT6i for the soiree.  Though the sky was not as steady as it was the previous evening, it was good enough to remind me about the advantages of binoviewing the Moon with a Dob.  First, there was the absence of violet around the lunar limb and certain bright features.  More importantly, the near total absence of floaters at high magnification  -  200x  -  permitted me to just purely and calmly take in and enjoy the lunar landscape.     


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#17 Dave Mitsky

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Posted 19 May 2021 - 06:49 PM

I bought my XT6i Dob thirteen years ago and though it may be getting on in years, it is not behaving that ancient when it comes to delivering the goods.  I have always said that one could be very happy to have such an instrument, if one could not afford something more powerful or finer.  The XT6i was used last night to acquire the X, the V, the Hoofprint, Rima, and other lunar targets, with a pair of 15mm Tele Vue Plossls sitting in a Big Easy binoviewer.       

Here's a photo of my venerable Orion SkyQuest XT6 that I took early yesterday evening.  I have many other telescopes, too many really, but I use this one often for casual observing under the light-polluted  skies of my home.

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  • Orion SkyQuest XT6 Dob 5-18-21 IMG_4041 Processed Resized 900.jpg

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#18 Dave Mitsky

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Posted 19 May 2021 - 08:04 PM

Here's an afocal photo that I took later with the Lunar X, Lunar V, Lunar V2 (or truncated Y), and Lunar L labeled.

Attached Thumbnails

  • Lunar X Lunar V2 Lunar L 17-inch 5-19-21 IMG_4091 Processed Rotated Cropped.jpg

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#19 Voyager 3

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Posted 20 May 2021 - 12:25 AM

I saw Lunar V but missed the X on May 18 ( 17:30 from my location , so daytime ! ) frown.gif  . 

Dave , 

Are there any links that provide the days of the best illumination of these lunar alphabets ?



#20 Dave Mitsky

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Posted 20 May 2021 - 03:37 PM

67champ (Dana) posts the predicted times for the apparitions of the Lunar X and the Curtiss Cross in the Lunar Observing and Imaging forum every year, Voyager 3.  I include these times in my monthly Celestial Calendar.

https://www.cloudyni...a#entry10936544

 

https://www.cloudyni...a#entry10704856


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#21 Dave Mitsky

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Posted 20 May 2021 - 04:32 PM

There's more on the Lunar X at https://skynews.ca/l...marks-the-spot/


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#22 NYJohn S

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Posted 21 May 2021 - 08:40 AM

I was out last night and it looked like another V appeared 2/3rd's of the way down on the terminator.

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  • Moon 05_20_21 1500px-9146.jpg

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#23 Voyager 3

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Posted 21 May 2021 - 11:31 AM

67champ (Dana) posts the predicted times for the apparitions of the Lunar X and the Curtiss Cross in the Lunar Observing and Imaging forum every year, Voyager 3.  I include these times in my monthly Celestial Calendar.

https://www.cloudyni...a#entry10936544

 

https://www.cloudyni...a#entry10704856

Thanks very much Dave . How I missed that in your calendar ever since !! 

John , that's a very fine image . What scope and eyepiece you used ? 



#24 NYJohn S

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Posted 21 May 2021 - 12:06 PM

Thanks very much Dave . How I missed that in your calendar ever since !! 

John , that's a very fine image . What scope and eyepiece you used ? 

Thanks, It was with my AT102ED, Meade UWA 8.8mm and iPhone XS Max. I think the biggest improvement to my Moon images came from using the Celestron NextYZ adapter. I'm able to make small adjustments and get the phone lined up to the eyepiece properly.



#25 Dave Mitsky

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Posted 21 May 2021 - 12:25 PM

I was out last night and it looked like another V appeared 2/3rd's of the way down on the terminator.

Yes, I've also noticed that sideways V or greater than symbol.

Attached Thumbnails

  • Longomontanus Light Ray & Sideways V 5-20-21 iPhone Orion XT6 Processed Rotated Resized 1000 Labeled.jpg



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