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Clair Obscur involving Philolaus Crater

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#1 doolsduck

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Posted 08 September 2019 - 08:46 AM

I was out observing the near occultation of Saturn tonight and poking around on the Moon when I saw this one involving the wall of Philolaus crater.  Looks like a scarecrow or maybe a crucifix.  The Moon was waxing 73.1% illuminated.  Sorry for the poor quality images I only had an iPhone with me. My 14" Dob with a 25mm Starguider eyepiece.

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  • Philolaus - 1 (1).jpg

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#2 sc285

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Posted 08 September 2019 - 05:50 PM

Not knowing your location or time of the event, I ran it through LTVT and came up with the following simulations, which matches your snapshots quite closely..

 

090819_1130UT_Scarecrow.jpg

 

Here is one with crater annotations:

 

090819_1130UT_Scarecrow2.jpg

 

and here are the generated predictions for the next several years for those that might want to try this on the next go around. Note that I ran these as a geocentric observer (center of the earth), so predicted times may not match location. Just look for a time that you know it will be visible above your horizon.

 

Searching for Colongitude = 20.917  with  Solar Lat = 1.371
Moon librations, elongation and percent illumination calculated for a geocentric observer

                      Sub-Solar Point     Librations                 Phase  
   Date      Time UT   Colong    Lat.    Long.    Lat.     Elong.   %Illum.    Age
09/08/2019  11:29:56   20.917   1.371    6.560  -0.282    117.327   73.057    9.037  +
10/07/2019  23:49:38   20.917   1.567    4.820   3.026    115.641   71.746    9.224  +
11/06/2019  13:05:59   20.917   1.330    2.222   5.572    113.013   69.663    9.394  +
12/06/2019  03:11:28   20.917   0.708   -0.785   6.783    109.925   67.160    9.504   
01/04/2020  17:45:20   20.917  -0.123   -3.771   6.346    106.874   64.638    9.522   
02/03/2020  08:19:04   20.917  -0.912   -6.283   4.294    104.372   62.536    9.442   
03/03/2020  22:24:02   20.917  -1.422   -7.810   1.049    102.929   61.311    9.286   
04/02/2020  11:39:32   20.917  -1.514   -7.868  -2.578    102.960   61.333    9.091   
05/01/2020  23:58:17   20.917  -1.180   -6.224  -5.518    104.601   62.720    8.897   
05/31/2020  11:27:45   20.917  -0.530   -3.166  -6.765    107.555   65.192    8.742   
06/29/2020  22:27:20   20.917   0.258    0.471  -5.830    111.114   68.117    8.657   
07/29/2020  09:22:55   20.917   0.980    3.706  -3.041    114.397   70.754    8.660  +
08/27/2020  20:40:45   20.917   1.448    5.885   0.632    116.680   72.551    8.749  +
09/26/2020  08:41:46   20.917   1.529    6.778   4.036    117.600   73.266    8.904  +
10/25/2020  21:37:03   20.917   1.185    6.381   6.246    117.125   72.902    9.087  +
11/24/2020  11:24:57   20.917   0.494    4.767   6.766    115.415   71.570    9.262   
12/24/2020  01:50:27   20.917  -0.350    2.128   5.566    112.748   69.451    9.398   
01/22/2021  16:27:54   20.917  -1.094   -1.126   3.005    109.550   66.853    9.478   
02/21/2021  06:47:16   20.917  -1.511   -4.355  -0.293    106.416   64.254    9.487   
03/22/2021  20:22:59   20.917  -1.489   -6.832  -3.553    104.002   62.221    9.418   
04/21/2021  09:01:56   20.917  -1.051   -7.968  -5.963    102.845   61.237    9.272   
05/20/2021  20:46:49   20.917  -0.337   -7.515  -6.816    103.208   61.542    9.074   
06/19/2021  07:54:10   20.917   0.455   -5.641  -5.722    105.016   63.068    8.876   
07/18/2021  18:48:39   20.917   1.122   -2.813  -2.852    107.887   65.466    8.731  +
08/17/2021  05:56:45   20.917   1.492    0.423   0.968    111.226   68.208    8.671  +
09/15/2021  17:41:06   20.917   1.460    3.534   4.480    114.358   70.725    8.701  +
10/15/2021  06:16:13   20.917   1.019    5.936   6.519    116.660   72.537    8.799  +
11/13/2021  19:45:31   20.917   0.274    7.033   6.506    117.656   73.311    8.938   
12/13/2021  09:59:29   20.917  -0.565    6.484   4.609    117.114   72.895    9.095   
01/12/2022  00:36:14   20.917  -1.248    4.428   1.522    115.151   71.362    9.252   
02/10/2022  15:06:04   20.917  -1.564    1.431  -1.875    112.237   69.039    9.389   
03/12/2022  05:00:10   20.917  -1.426   -1.786  -4.763    109.035   66.428    9.476   
04/10/2022  18:00:07   20.917  -0.891   -4.594  -6.512    106.171   64.048    9.483   
05/10/2022  06:03:15   20.917  -0.126   -6.580  -6.728    104.108   62.309    9.399   
06/08/2022  17:21:57   20.917   0.657   -7.515  -5.296    103.139   61.486    9.244   
07/08/2022  04:18:27   20.917   1.257   -7.268  -2.434    103.440   61.738    9.060  +
08/06/2022  15:18:43   20.917   1.521   -5.741   1.224    105.066   63.110    8.891  +
09/05/2022  02:47:02   20.917   1.378   -2.976   4.633    107.859   65.444    8.771  +
10/04/2022  15:01:39   20.917   0.850    0.588   6.588    111.327   68.291    8.713   
11/03/2022  04:11:07   20.917   0.069    4.010   6.299    114.643   70.952    8.724   
12/02/2022  18:11:13   20.917  -0.749    6.262   3.896    116.919   72.739    8.801   

  + = Latitude of sub-solar point within 0.50∞ of target (= 1.371∞)

                      *** search completed ***


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#3 doolsduck

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Posted 08 September 2019 - 06:37 PM

Thanks so much for the extra info!  The time was UT 13:00hrs and my location is 27º 31'S 152º56'E.  




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