Predictions for Grazing Occultation of ZC 1635, 2009 Apr 7

Grazing Occultation of    1635cM0      Magnitude 5.2 [Red = 4.4]   
   R1635 = 75 Leonis
Date: 2009 Apr 07  8h 42m,  to  2009 Apr 07  8h 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
 169  0  0  -43 38 28   8 42  9       35  43  1.42  35.4  13.45  17.24N
 169 10  0  -43 48  7   8 42 37       35  43  1.42  35.4  13.47  17.26N
 169 20  0  -43 57 48   8 43  4       35  43  1.41  35.4  13.48  17.27N
 169 30  0  -44  7 31   8 43 31       35  42  1.41  35.4  13.49  17.28N
 169 40  0  -44 17 16   8 43 58       35  42  1.41  35.4  13.50  17.29N
 169 50  1  -44 27  3   8 44 26       35  42  1.41  35.4  13.51  17.30N
 170  0  1  -44 36 52   8 44 53       35  41  1.41  35.4  13.51  17.30N
 170 10  1  -44 46 42   8 45 20       35  41  1.41  35.4  13.52  17.31N
 170 20  1  -44 56 35   8 45 48       35  40  1.41  35.4  13.53  17.32N
 170 30  1  -45  6 29   8 46 15       35  40  1.41  35.5  13.53  17.32N
 170 40  1  -45 16 24   8 46 42       35  40  1.41  35.5  13.54  17.33N
 170 50  1  -45 26 22   8 47 10       35  39  1.41  35.5  13.54  17.33N
 171  0  1  -45 36 20   8 47 37       35  39  1.41  35.5  13.54  17.33N

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  12 meters

      1635 is double: AB  5.8  6.6 0.044"   0.0

                Librations  Long +3.96   Lat +3.69
                            P +13.73     D -2.41
      Illumination of moon  94%+
        Elongation of Moon  152
    Vertical Profile Scale  3.19 km/arcsec at mean distance of moon
   Horizontal Scale Factor  1.59 deg/min


At longitude 170.00:
Limiting Magnitudes for various telescope apertures (in cm)
      CA\Tdia   5    10    15    20    25    30    35
    13.3      4.4   5.8   6.6   7.0   7.3   7.5   7.7
    15.3      4.7   6.1   6.9   7.3   7.7   7.9   8.0
    17.3      5.1   6.6   7.3   7.8   8.1   8.3   8.5
    19.3      5.3   6.7   7.5   8.0   8.3   8.5   8.7
    21.3      5.3   6.7   7.5   8.0   8.3   8.5   8.7

Lunar Limb Profile