Predictions for Grazing Occultation of ZC 2771, 2009 Feb 20

Grazing Occultation of    2771cK2      Magnitude 5.6 [Red = 5.0]   
Date: 2009 Feb 20 16h 48m,  to  2009 Feb 20 16h 52m

Nominal site altitude 5m

E. Longit.   Latitude     U.T.    Sun  Moon   TanZ   PA    AA      CA
   o  '  "    o  '  "   h  m  s   Alt Alt Az          o     o      o
 145  0  0  -29 37 28  16 48 10        6 115 10.25 179.1 183.87   7.01S
 145 30  0  -29 51 44  16 48 16        6 115  9.38 179.1 183.86   6.99S
 146  0  0  -30  5 58  16 48 23        7 115  8.65 179.0 183.84   6.98S
 146 30  0  -30 20 11  16 48 30        7 115  8.01 179.0 183.83   6.96S
 147  0  0  -30 34 22  16 48 37        8 114  7.47 179.0 183.81   6.94S
 147 30  0  -30 48 32  16 48 45        8 114  6.99 179.0 183.79   6.92S
 148  0  0  -31  2 40  16 48 54        9 114  6.57 179.0 183.77   6.90S
 148 30  0  -31 16 45  16 49  3        9 114  6.19 178.9 183.75   6.88S
 149  0  0  -31 30 49  16 49 13       10 113  5.86 178.9 183.73   6.86S
 149 30  0  -31 44 50  16 49 23       10 113  5.55 178.9 183.71   6.84S
 150  0  0  -31 58 49  16 49 34       11 113  5.28 178.9 183.68   6.81S
 150 30  0  -32 12 46  16 49 45       11 112  5.03 178.8 183.66   6.79S
 151  0  0  -32 26 40  16 49 57       12 112  4.80 178.8 183.63   6.76S
 151 30  0  -32 40 30  16 50 10       12 112  4.59 178.8 183.60   6.73S
 152  0  0  -32 54 18  16 50 23       13 111  4.40 178.8 183.57   6.71S
 152 30  0  -33  8  3  16 50 36       13 111  4.23 178.7 183.54   6.67S
 153  0  0  -33 21 45  16 50 50       14 111  4.06 178.7 183.51   6.64S
 153 30  0  -33 35 23  16 51  5       14 110  3.91 178.7 183.48   6.61S
 154  0  0  -33 48 57  16 51 20       15 110  3.77 178.6 183.44   6.58S
 154 30  0  -34  2 28  16 51 35       15 110  3.63 178.6 183.41   6.54S

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

      2771 is double: 
           AB  6.5  6.5 0.10" 113.0  Graze path of B 0.08 km north, and 0.2 secs later compared to A

                Librations  Long +0.58   Lat +2.55
                            P +183.83     D +2.76
      Illumination of moon  16%-
        Elongation of Moon  48
    Vertical Profile Scale  1.97 km/arcsec at mean distance of moon
   Horizontal Scale Factor  1.96 deg/min


At longitude 147.50:
Limiting Magnitudes for various telescope apertures (in cm)
      CA\Tdia   5    10    15    20    25    30    35
     2.9      4.5   5.9   6.6   7.0   7.3   7.5   7.6
     4.9      4.6   6.0   6.7   7.1   7.4   7.6   7.7
     6.9      4.6   6.0   6.7   7.1   7.4   7.6   7.8
     8.9      5.7   7.1   7.9   8.4   8.7   9.0   9.2
    10.9      5.7   7.2   8.0   8.5   8.8   9.1   9.3

Lunar Limb Profile