Predictions for Grazing Occultation of ZC 1925, 2013 Mar 28

Graze profile
Grazing Occultation of    1925SB1      Magnitude 1.0 [Red = 1.1]  e
   R1925 = Spica = alpha Virginis
Date: 2013 Mar 28 15h 45m,  to  2013 Mar 28 15h 48m

Nominal site altitude 100m

E. Longit.   Latitude     U.T.    Sun  Moon   TanZ   PA    AA      CA
   o  '  "    o  '  "   h  m  s   Alt Alt Az          o     o      o
 172  0  0  -34 24 13  15 45 21       52 299  0.78 201.2 178.08  -6.75S
 172 10  0  -34 25 59  15 45 36       52 299  0.78 201.2 178.04  -6.79S
 172 20  0  -34 27 44  15 45 51       52 299  0.79 201.1 177.99  -6.83S
 172 30  0  -34 29 28  15 46  6       52 299  0.79 201.1 177.95  -6.88S
 172 40  0  -34 31 10  15 46 21       51 298  0.80 201.0 177.91  -6.92S
 172 50  1  -34 32 52  15 46 36       51 298  0.80 201.0 177.86  -6.96S
 173  0  1  -34 34 32  15 46 51       51 298  0.81 200.9 177.82  -7.01S
 173 10  1  -34 36 11  15 47  6       51 298  0.81 200.9 177.78  -7.05S
 173 20  1  -34 37 50  15 47 20       51 298  0.82 200.9 177.73  -7.09S
 173 30  1  -34 39 27  15 47 35       50 297  0.83 200.8 177.68  -7.15S
 173 40  1  -34 41  3  15 47 50       50 297  0.83 200.8 177.65  -7.18S
 173 50  1  -34 42 37  15 48  4       50 297  0.84 200.7 177.60  -7.22S

Path coordinates are referred to WGS84 (as used by GPS), with the
nominal site altitude being referenced to Mean Sea Level.

Projected diameter of star  2 meters  [CHARM/CADARS, 6 measures]

1925 is variable: 
      1925 = alf Vir, 0.95, range 0.1, V, Type EA+BCEP, Period 4.014604 days, Phase 89 %

1925 is triple: 
  AB 1.0 12.0 153"  33.0 (BUP 150) Graze path of B 299.65 km south, and 76.5 secs later compared to A
  AC 1.0 10.5 367"  60.9 (BUP 150) Graze path of C 564.59 km south, and 565.5 secs later compared to A

                Librations  Long -4.19   Lat +2.43
                            P +177.63     D +2.53
      Illumination of moon  98%-
        Elongation of Moon  164
    Vertical Profile Scale  1.93 km/arcsec at mean distance of moon
   Horizontal Scale Factor  1.48 deg/min


At longitude 173.00:
Limiting Magnitudes for various telescope apertures (in cm)
      CA\Tdia   5    10    15    20    25    30    35
   -11.0      2.2   3.6   4.4   4.8   5.2   5.4   5.5
    -9.0      2.2   3.6   4.4   4.8   5.2   5.4   5.5
    -7.0      2.2   3.6   4.4   4.8   5.2   5.4   5.5
    -5.0      2.2   3.6   4.4   4.8   5.2   5.4   5.5
    -3.0      2.2   3.6   4.4   4.8   5.2   5.4   5.5

------------------------------------------------------------------------------
Double star catalogue details
WDS entries 
 
  RA  Dec Name          Y1   Y2     N  PA  PA   Sep   Sep  M1    M2 
13252-1110BUP 150AB    1879 2007    4  33  33 144.4 152.5  0.98 12.0            -041-028          -10 3672 N D  132511.58-110940.4 
13252-1110BUP 150AC    1879 1999    2  62  61 359.8 366.6  0.98 10.5            -043-032                   N D  132511.58-110940.4 
 
------------------------------------------------ 
Interferometric catalogue entries 
 
132511.60-110940.5  HR 5056                   alp Vir                   HD 116658    HIP  65474         13252-1110 N   
    Date       PA              Sep                  M1             M2 
  1975.      V180.      .      0.5        .         1.3     .      7.5     .                       1  OCC2002  O       
  1975.      V225.      .      0.05       .         1.3     .      4.5     .                       1  OCC2002  O       
  1988.166       .      .   <  0.038      .          .      .       .      .       549  22   3.6   1  McA1993  Sc      
  1989.3938      .      .   <  0.05       .          .      .       .      .                 2.1   1  Iso1992  S       
  1991.25        .      .   <  0.1        .         0.89    .       .      .       511 222   0.3   1  HIP1997e Hh      
  1995.2090  V237.      .       .         .          .      .       .      .      1260 290         1  Rch1996  O       
  2002.2408      .      .   <  0.13       .          .      .       .      .       900 340   3.6   1  Rbr2007  A       
  2002.2409      .      .   <  0.08       .          .      .       .      .       900 340   3.6   1  Rbr2007  A       
 
 
------------------------------------------------ 
AAVSO Variable star entry 
 
       Variable identifier           Type        Max    Min  Ph  Epoch         Period  
       alf Vir                       EA+BCEP     0.95 ( 0.1  V 2419530.4900     4.014604    
------------------------------------------------------------------------------
Results of Observer Scan                                    UT
Site                              Long.   Lat.   Dist.    h  m  s
Auckland                          174.8  -36.9   223km   15 49 27
MidNZ                             173.0  -41.0   697km   15 46 51

 

Lunar Limb Profile

Lunar Limb Profile