Predictions for Grazing Occultation of ZC 2750, 2008 Aug 13

Grazing Occultation of    2750 SB2      Magnitude   2.1 
 2750 = Nunki = sigma Sagittarii              

Date   2008 August 13    (Wednesday)     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
 113  0  0  -22  4 54  11 45 35       60 105  0.57 173.9 178.36  -3.39S
 113 10  0  -22  6 15  11 45 56       60 105  0.57 173.8 178.27  -3.31S
 113 20  0  -22  7 35  11 46 17       61 105  0.56 173.7 178.19  -3.23S
 113 30  0  -22  8 52  11 46 38       61 105  0.56 173.6 178.11  -3.15S
 113 40  0  -22 10  8  11 46 59       61 105  0.55 173.6 178.03  -3.07S
 113 50  0  -22 11 22  11 47 21       61 105  0.54 173.5 177.95  -2.99S
 114  0  0  -22 12 34  11 47 42       62 105  0.54 173.4 177.87  -2.91S
 114 10  0  -22 13 44  11 48  3       62 105  0.53 173.3 177.79  -2.82S
 114 20  0  -22 14 53  11 48 25       62 105  0.53 173.2 177.71  -2.74S
 114 30  0  -22 16  0  11 48 46       62 105  0.52 173.2 177.63  -2.66S
 114 40  0  -22 17  4  11 49  8       63 105  0.52 173.1 177.55  -2.58S
 114 50  0  -22 18  7  11 49 29       63 105  0.51 173.0 177.46  -2.50S
 115  0  0  -22 19  8  11 49 51       63 105  0.51 172.9 177.38  -2.41S
 115 10  0  -22 20  7  11 50 13       63 105  0.50 172.8 177.30  -2.33S
 115 20  0  -22 21  4  11 50 35       64 105  0.50 172.7 177.21  -2.25S
 115 30  0  -22 22  0  11 50 56       64 105  0.49 172.7 177.13  -2.16S
 115 40  0  -22 22 53  11 51 18       64 105  0.49 172.6 177.05  -2.08S
 115 50  0  -22 23 45  11 51 40       64 105  0.48 172.5 176.96  -1.99S
 116  0  0  -22 24 34  11 52  2       64 105  0.48 172.4 176.88  -1.91S

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

   2750 is triple :   2.9  2.9   0.100"   90.0 :   2.0  9.5  309"  244.0
Graze Path of component #2  0.02km North, and 0.3 secs. later cf. primary.
Graze Path of component #3  175.24km North, and 963.3 secs. earlier cf. primary.

                Librations  Long -1.79   Lat +4.10
                            P +176.7     D +4.3
      Illumination of moon  89%+
        Elongation of Moon  141
    Vertical Profile Scale  1.87 km/arcsec at mean distance of moon
   Horizontal Scale Factor  1.17 deg/min

Limiting Magnitudes for various telescope apertures (in mm)
      CA\Tdia  50   100   150   200   250   300   350
    -5.9      2.5   4.0   4.8   5.2   5.6   5.8   6.0
    -3.9      2.5   4.0   4.8   5.2   5.6   5.8   6.0
    -1.9      2.5   4.0   4.8   5.2   5.6   5.8   6.0
     0.1      2.5   4.0   4.8   5.2   5.6   5.8   6.0
     2.1      2.5   4.0   4.8   5.2   5.6   5.8   6.0    

Lunar Limb Profile