Grazing Occultation of     847cB4      Magnitude 3.0 [Red = 3.1]  e
   R847 = zeta Tauri
Date: 2012 May 23  2h 45m,  to  2012 May 23  2h 46m

Nominal site altitude 236m

E. Longit.   Latitude     U.T.    Sun  Moon   TanZ   PA    AA      CA
   o  '  "    o  '  "   h  m  s   Alt Alt Az          o     o      o
- 97  0  0   40 56  7   2 44 57  -10   6 293  9.63   9.4  13.04   5.73N
- 96 45  0   40 49 29   2 45  1  -10   6 293 10.01   9.4  13.04   5.73N
- 96 30  0   40 42 52   2 45  5  -11   5 293 10.44   9.4  13.03   5.71N
- 96 15  0   40 36 16   2 45  9  -11   5 293 10.89   9.4  13.02   5.70N
- 96  0  0   40 29 41   2 45 12  -11   5 294 11.39   9.4  13.00   5.69N
- 95 45  0   40 23  7   2 45 16  -11   5 294 11.94   9.4  12.99   5.68N
- 95 30  0   40 16 34   2 45 19  -12   5 294 12.54   9.4  12.98   5.67N
- 95 15  0   40 10  3   2 45 22  -12   4 294 13.20   9.4  12.97   5.66N
- 95  0  0   40  3 32   2 45 25  -12   4 294 13.94   9.3  12.96   5.65N
- 94 45  0   39 57  3   2 45 28        4 294 14.76   9.3  12.95   5.64N
- 94 30  0   39 50 35   2 45 31        4 295 15.68   9.3  12.94   5.63N
- 94 15  0   39 44  8   2 45 34        3 295 16.73   9.3  12.93   5.61N
- 94  0  0   39 37 43   2 45 36        3 295 17.92   9.3  12.91   5.60N
- 93 45  0   39 31 18   2 45 38        3 295 19.29   9.3  12.90   5.59N
- 93 30  0   39 24 55   2 45 41        3 295 20.89   9.3  12.89   5.58N
- 93 15  0   39 18 33   2 45 43        3 295 22.77   9.3  12.88   5.57N
- 93  0  0   39 12 12   2 45 45        2 296 25.02   9.2  12.86   5.55N
- 92 45  0   39  5 52   2 45 46        2 296 27.76   9.2  12.85   5.54N
- 92 30  0   38 59 34   2 45 48        2 296 31.17   9.2  12.84   5.53N
- 92 15  0   38 53 17   2 45 49        2 296 35.52   9.2  12.83   5.52N
- 92  0  0   38 47  1   2 45 51        1 296 41.28   9.2  12.81   5.50N

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  3 meters  [CHARM/CADARS, 8 measures]

847 is variable: 
       847 = zet Tau, 2.80 to 3.17, V, Type E/GS+GCAS, Period 132.9735 days, Phase 73 %

847 is double: 
  This next pair is not confirmed
  ** 3.2 5.2 0.007" 350.0** (OCc1268) Graze path of ? 0.02 km south, and 0.0 secs earlier compared to the primary

                Librations  Long -4.77   Lat +2.95
                            P +12.69     D -3.69
      Illumination of moon  4%+
        Elongation of Moon  23
    Vertical Profile Scale  2.60 km/arcsec at mean distance of moon
   Horizontal Scale Factor  2.13 deg/min


At longitude -94.50:
Limiting Magnitudes for various telescope apertures (in cm)
      CA\Tdia   5    10    15    20    25    30    35
     1.6      5.3   6.7   7.6   8.1   8.5   8.8   9.1
     3.6      5.3   6.7   7.6   8.1   8.5   8.8   9.1
     5.6      5.3   6.7   7.6   8.1   8.5   8.9   9.1
     7.6      5.3   6.8   7.6   8.1   8.6   8.9   9.1
     9.6      5.3   6.8   7.6   8.2   8.6   8.9   9.1

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Double star catalogue details
Interferometric catalogue entries 
 
053738.68+210833.3  HR 1910                   zet Tau                   HD  37202    HIP  26451         05376+2109     
    Date       PA              Sep                  M1             M2 
  1921.300       .      .   <  0.030      .          .      .       .      .       550       1.6   1  Mrr1922  Jmw     
  1988.9097      .      .   <  0.077      .          .      .       .      .       549  22   1.8   2  Msn1997c Sch     
  1991.25        .      .   V   .         .         2.97    .       .      .       511       0.3   1  HIP1997g Thp     
  1991.9050      .      .   <  0.036      .          .      .       .      .       549  22   3.8   1  Msn1997c Sch     
  1996.8717      .      .   <  0.055      .          .      .       .      .       549  22   2.5   1  Msn1997c Sch     
  1997.1255      .      .   <  0.055      .          .      .       .      .       549  22   2.5   1  Msn1997c Sch     
 
 
------------------------------------------------ 
AAVSO Variable star entry 
 
       Variable identifier           Type        Max    Min  Ph  Epoch         Period  
       zet Tau                       E/GS+GCAS   2.80   3.17 V 2444936.7810   132.9735      
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Results of Observer Scan                                    UT
Site                              Long.   Lat.   Dist.    h  m  s
C  2 Nebraska CNE Lanning~Eugene  -95.9   40.7    20km    2 45 13
C  3 Bonner SprKS Robinson~Walte  -94.9   39.1    93km    2 45 26
C  4 Blue SprinMO Sandy~Robert L  -94.3   39.0    73km    2 45 32
C  5 Ames      IA Wormley~Samuel  -93.6   42.0   247km    2 45 39
C  6 DodgevilleWI Oesper~David    -93.6   42.1   255km    2 45 40
C  7 NorthfieldMN Messner~Steve   -93.1   44.5   501km    2 45 43
C  8 Rolla     MO Senne~Joseph H  -91.8   37.9    74km    2 45 52