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Lunar X 2020.

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#1 beggarly

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Posted 01 November 2019 - 04:06 AM

Start times for Lunar X calculated with Lunar Terminator Visualization Tool. LTVT version 0_21_5x.
                                         ( https://github.com/f...i/LTVT Download )
          
------------------------------------------------------------------------------------------------------------
Searching for Sun Angle = -1.0000° over feature at 0.900°E   25.300°S
Moon librations, elongation and percent illumination calculated for a geocentric observer

                           Sun Angle       Sub-Solar Point     Librations                 Phase  
   Date      Time UT   Altitude  Azimuth    Colong    Lat.    Long.    Lat.     Elong.   %Illum.    Age
02/01/2020  20:24:54   -1.0000   90.5635   357.955  -0.082   -1.579   6.864     85.703   46.854    7.633
01/02/2020  10:15:05   -1.0000   91.4447   357.578  -0.879   -4.464   6.024     83.699   43.959    7.523
01/03/2020  23:52:56   -1.0000   92.0331   357.327  -1.410   -6.640   3.667     79.563   41.848    7.348
31/03/2020  13:05:18   -1.0000   92.1654   357.270  -1.530   -7.674   0.282     80.302   40.967    7.151
30/04/2020  01:44:46   -1.0000   91.8243   357.416  -1.222   -7.183  -3.286     79.426   41.595    6.971
29/05/2020  13:52:08   -1.0000   91.1227   357.716  -0.587   -5.033  -5.962     83.393   43.720    6.843
28/06/2020  01:36:21   -1.0000   90.2559   358.087   0.196   -1.612  -6.774     85.534   46.926    6.788
27/07/2020  13:11:50   -1.0000   89.4489   358.431   0.926    2.156  -5.348     91.262   50.435    6.819
26/08/2020  00:54:34   -1.0000   88.9108   358.661   1.412    5.264  -2.186     92.778   53.372    6.926
24/09/2020  12:58:26   -1.0000   88.7919   358.712   1.520    7.106   1.591     96.654   55.102    7.082
24/10/2020  01:32:38   -1.0000   89.1429   358.562   1.202    7.523   4.798     95.169   55.368    7.251
22/11/2020  14:40:13   -1.0000   89.8847   358.245   0.532    6.585   6.605     95.384   54.235    7.398
22/12/2020  04:17:20   -1.0000   90.8112   357.849  -0.306    4.470   6.675     91.728   51.978    7.500
                                                                                      Average age: 7.2 days.

                      *** search completed ***
------------------------------------------------------------------------------------------------------------

File with values calculated for Sun angle -1.5°, -1.0°, 0.0°, 0.25°, 0.5° and 1.0° at Lunar X (coordinates 0.9° E, 25.3° S).

 

Attached File  LunarX 2020.txt   10.78KB   86 downloads


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#2 beggarly

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Posted 01 November 2019 - 04:07 AM

These simulations show what the Lunar X looks like when Sun angle is:
-1.5°  -1.0°  0.0°
0.25°   0.5°  1.0°

 

LunarX_2020.jpg


Edited by beggarly, 01 November 2019 - 04:08 AM.

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#3 beggarly

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Posted 01 November 2019 - 04:09 AM

Earth viewed from the Moon at the time when the Sun angle is 0.0° above Lunar X so you can determine if an event will be visible from your location.

 

Earth View.jpg


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#4 Swamp Fox

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Posted 01 November 2019 - 01:19 PM

Thanks for sharing!!

 

-Mark



#5 67champ

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Posted 14 November 2019 - 10:37 PM

Wondered what the difference is between -1.0 Sun Alt and -0.9 (my "new" parameter):

 

Start times for fully formed Lunar X using -0.90 Sun Alt over the feature.  Year: 2020

 

Date                UT

Jan  2              2039

Feb  1              1032

Mar  2              0011

Mar 31             1325

Apr 30             0204

May 29            1410

Jun 28             0152

Jul 27              1325

Aug 26            0106

Sep 24            1309

Oct 24             0144

Nov 22            1454

Dec 22            0433

 

Dana T


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#6 Dave Mitsky

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Posted 31 December 2019 - 01:22 PM

Have you calculated the data for the Curtiss Cross, Dana?



#7 beggarly

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Posted 01 January 2020 - 05:13 AM

Curtiss Cross is viewed best when colongitude is ~190°.

 

Attached File  Curtiss Cross.txt   3.22KB   31 downloads

 

Fra Mauro.jpg



#8 67champ

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Posted 02 January 2020 - 05:33 PM

beggarly,

 

Years ago on one night I observed the Curtiss Cross around Co-long of <193.0 and "the cross" didn't "pop" out at me until later as the terminator moved closer to craters Parry and Gambart.  At that time, "the cross" became more apparent.  I now use Co-long of 193.5 to predict the "start".  If I understand your last post; Co-long ~190 would be way too early to see the classic Curtiss Cross apparition.   Thoughts?

 

dana t


Edited by 67champ, 02 January 2020 - 05:35 PM.


#9 beggarly

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Posted 03 January 2020 - 01:51 AM

I mean the feature is best viewed when the evening terminator is near it and not the morning terminator when colongitude is ~16.7°.

 

https://web.archive....m/curtiss cross


Edited by beggarly, 03 January 2020 - 04:18 AM.



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