Predictions for Grazing Occultation of ZC 1815, 2008 Jun 12

Grazing Occultation of 1815 SK2, Magnitude 4.7, 1815 = chi Virginis                          

Date   2008 June 12    (Thursday)     Nominal site altitude  0m

E. Longit.   Latitude     U.T.    Sun  Moon   TanZ   PA    WA      CA
   o  '  "    o  '  "   h  m  s   Alt Alt Az          o     o      o
 170  0  0  -42 56 27  10 59  1       37 297  1.34  31.9   9.96  10.14N
 170 10  0  -42 58 40  10 59 15       37 297  1.34  31.8   9.92  10.10N
 170 20  0  -43  0 51  10 59 28       37 297  1.35  31.8   9.86  10.05N
 170 30  0  -43  3  2  10 59 41       36 297  1.36  31.7   9.81   9.99N
 170 40  0  -43  5 11  10 59 55       36 296  1.37  31.7   9.76   9.94N
 170 50  0  -43  7 18  11  0  8       36 296  1.38  31.6   9.71   9.89N
 171  0  0  -43  9 25  11  0 21       36 296  1.38  31.6   9.66   9.84N
 171 10  0  -43 11 30  11  0 34       36 296  1.39  31.5   9.61   9.79N
 171 20  0  -43 13 34  11  0 47       36 296  1.40  31.5   9.56   9.74N
 171 30  0  -43 15 37  11  1  0       35 295  1.41  31.4   9.51   9.69N
 171 40  0  -43 17 38  11  1 13       35 295  1.42  31.4   9.46   9.64N
 171 50  0  -43 19 39  11  1 26       35 295  1.42  31.3   9.41   9.59N
 172  0  0  -43 21 38  11  1 38       35 295  1.43  31.3   9.36   9.55N
 172 10  0  -43 23 36  11  1 51       35 295  1.44  31.2   9.32   9.50N
 172 20  0  -43 25 32  11  2  3       35 295  1.45  31.2   9.26   9.44N
 172 30  0  -43 27 28  11  2 16       34 294  1.46  31.1   9.22   9.40N
 172 40  0  -43 29 22  11  2 28       34 294  1.47  31.1   9.17   9.35N
 172 50  0  -43 31 15  11  2 40       34 294  1.48  31.0   9.12   9.30N
 173  0  0  -43 33  7  11  2 53       34 294  1.49  31.0   9.07   9.25N

Path coordinates are referred to WGS84 (as used by GPS).

   1815 is multiple :   4.8  8.8   0.100"  214.0 :   4.6  9.1  174"  137.0 :   4.6 10.4  223"  110.0
Graze Path of component #2  0.19km North, and 0.0 secs. earlier cf. primary.
Graze Path of component #3  90.55km North, and 416.8 secs. later cf. primary.
Graze Path of component #4  80.34km South, and 545.5 secs. later cf. primary.

                Librations  Long +5.18   Lat +4.90
                            P +9.5     D -3.8
      Illumination of moon  67%+
        Elongation of Moon  110
    Vertical Profile Scale  1.96 km/arcsec at mean distance of moon
   Horizontal Scale Factor  1.53 deg/min

Limiting Magnitudes for various telescope apertures (in mm)
      CA\Tdia  50   100   150   200   250   300   350
     5.3      5.1   6.5   7.3   7.8   8.1   8.3   8.5
     7.3      5.5   7.0   7.7   8.2   8.5   8.8   8.9
     9.3      5.5   7.0   7.7   8.2   8.6   8.8   9.0
    11.3      5.5   7.0   7.8   8.2   8.6   8.8   9.0
    13.3      5.6   7.0   7.8   8.3   8.6   8.8   9.0

Lunar Limb Profile