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2018 Lunar X Predictions

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#1 67champ

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Posted 17 November 2017 - 09:33 AM

2018 Lunar X Predictions (approx "start times"):

 

Using Werner (1.2 Sun Alt) with coordinates of:

LAT      -28.0

LON     3.3

 

Date                Time           Sun Angle at the X at this time

 

01/24/2018    0442UT          -.975 @ X

02/22/2018    1807UT          -1.025 @ X

03/24/2018    0657UT          -1.064 @ X

04/22/2018    1913UT          -1.082 @ X

05/22/2018    0702UT          -1.079 @ X

06/20/2018    1837UT          -1.054 @ X

07/20/2018    0614UT          -1.010 @ X

08/18/2018    1809UT          -0.956 @ X

09/17/2018    0632UT          -0.920 @ X

10/16/2018    1930UT          -0.901 @ X

11/15/2018    0859UT          -0.903 @ X

12/14/2018    2246UT          -0.935 @ X

 

Average = -.0.992 @ X

 

Someday, when I have time, I will use Sun angle at the X of -1.000 to predict the start of event.  Either way, the times are very close as the start of the event which is somewhat subjectional...

 

Dana T


Edited by 67champ, 17 November 2017 - 02:44 PM.

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#2 Jayem

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Posted 17 November 2017 - 09:43 AM

Thanks, Dana...the Lunar X

 

John Moore


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#3 beggarly

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Posted 17 November 2017 - 10:59 AM

Lunar X and Lunar V 2018. Calculated with LTVT version 0.21.5x6.

https://ltvt.wikispaces.com/LTVT          https://holdfenyarny.../ltvt-setup.pdf

Attached Files


Edited by beggarly, 17 November 2017 - 05:05 PM.


#4 Muddman97

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Posted 22 November 2017 - 02:12 PM

I caught both the X and the V one evening this past Summer. 

 

I didn't even know what I had until a fellow astronomer pointed them out to me. 

 

I had no idea I had imaged a highly sought after lunar artifact.

 

Lunar X and V

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#5 Tom Hoffelder

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Posted 13 January 2018 - 02:15 PM

Approximately 3 hrs difference between the two lists.  First list says "start times."  Maybe the second is the middle of the event?



#6 67champ

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Posted 13 January 2018 - 05:02 PM

Tom,

 

I would probably interpret beggarly's two lists as approx. start times and then approx. end times...  waiting for beggarly to respond....

 

dana t



#7 AUricle

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Posted 22 February 2018 - 04:50 PM

Lunar X and Lunar V 2018. Calculated with LTVT version 0.21.5x6.

          https://holdfenyarny.../ltvt-setup.pdf

 

Downloaded the files from the above linked wordpress. The final file "Clementine V2 texture map" does not appear downloadable at all........am I missing something there?



#8 beggarly

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Posted 25 February 2018 - 04:56 AM

I downloaded the Clementine V2 file without a problem 5 minutes ago.

I also downloaded this file after changing the image size. Height to 1060 and width to 2160 to get better resolution.

(Right click - Save image as).

 

https://www.mapaplan...on&center_lat=0

 

If you want even better resolution download from http://wms.lroc.asu...._E000N0000_064P the *.TIF - (253.21 MB) and convert to JPG (http://www.irfanview.com/). I think I had to reduce the size of the JPG file to prevent LTVT from crashing. The size of the file I use is 95573010 bytes.

 

Hope this helps.


Edited by beggarly, 25 February 2018 - 04:58 AM.


#9 Duke2k

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Posted 22 April 2018 - 06:57 PM

Lunar X and Lunar V 2018. Calculated with LTVT version 0.21.5x6.

https://ltvt.wikispaces.com/LTVT          https://holdfenyarny.../ltvt-setup.pdf

I have followed the right hand link and downloaded the files but the LDEM_64.LBL file is just text.

How do I download it and in what format should it be saved?

 

Any help would be very much appreciated.



#10 Star Geezer

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Posted 22 April 2018 - 08:44 PM

New member, initiating contact. This an amazing forum. I started observing the moon today from my location at approx. 2:00 PM. The werner X was clearly highlighted nicely. Knowing I only had maybe a couple hours. I watched till it became obscure. So, I was curious when would be a more favorable time to observe it.

 

67champ; Thank you for your predictions.


Edited by Star Geezer, 22 April 2018 - 08:51 PM.

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#11 beggarly

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Posted 23 April 2018 - 03:03 AM

I have followed the right hand link and downloaded the files but the LDEM_64.LBL file is just text.

How do I download it and in what format should it be saved?

 

Any help would be very much appreciated.

Right click and choose 'Save as' LDEM_64.LBL



#12 beggarly

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Posted 23 April 2018 - 03:31 AM

New member, initiating contact. This an amazing forum. I started observing the moon today from my location at approx. 2:00 PM. The werner X was clearly highlighted nicely. Knowing I only had maybe a couple hours. I watched till it became obscure. So, I was curious when would be a more favorable time to observe it.

 

67champ; Thank you for your predictions.

Welcome to Cloudy Nights.

I think that in June, August, October and December the Lunar X will be visible again from your location. The pictures show the sub lunar point at the time of First Quarter.

Attached Thumbnails

  • SubLunar2018.jpg

Attached Files


Edited by beggarly, 23 April 2018 - 10:02 AM.


#13 Tom Hoffelder

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Posted 23 April 2018 - 08:08 AM

I don't see an obvious answer to my question back in January about the three hour difference in the two lists, but I can now report when I saw what yesterday.  I had hoped to have our 8 inch f/6 Newtonian set up before the earlier time listed, 19:13 UT, but did not get my first view until 19:45 UT, when the X was fully formed although not as large and bright as it was later.  My last and best view was at 22:00 UT, with the X showing its best definition.  Part of that could have been because the sun was lower, the moon higher and the seeing better.  I have never observed an X to the end so don't know how long it lasts, but maybe it is about three hours? This was taken at 21:10 UT by holding my cellphone to the eyepiece.

Attached Thumbnails

  • 20180422_171053-1.jpg


#14 beggarly

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Posted 23 April 2018 - 09:40 AM

... answer to my question back in January about the three hour difference in the two lists,

 

The first list shows the times when the altitude of the Sun at Lunar X is -1.0°. The PDF file starts with an altitude of 0.5°, 3 hours later.

At the time of your best observation (22:00 UT), the altitude of the Sun was 0.25°. I'll include that angle in the list for next year.

Attached Thumbnails

  • Sun Angle.jpg

Attached Files



#15 Tom Hoffelder

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Posted 23 April 2018 - 04:59 PM

Aha, the images are what I needed; the sun angle didn't mean anything to me!  Thank you!  It all makes sense now!




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