Predictions for Grazing Occultation of ZC 2750, 2008 May 23

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

Date   2008 May 23    (Friday)     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 30  9  15 45 47       42 106  1.11 179.4 183.94   1.04S
 113 10  0  -22 33 35  15 46  2       42 106  1.10 179.3 183.90   0.99S
 113 20  0  -22 37  0  15 46 18       42 106  1.10 179.3 183.85   0.95S
 113 30  0  -22 40 24  15 46 34       43 106  1.09 179.3 183.81   0.90S
 113 40  0  -22 43 47  15 46 49       43 106  1.08 179.2 183.76   0.86S
 113 50  0  -22 47  9  15 47  5       43 105  1.07 179.2 183.72   0.81S
 114  0  0  -22 50 29  15 47 21       43 105  1.06 179.1 183.67   0.77S
 114 10  0  -22 53 48  15 47 37       44 105  1.05 179.1 183.62   0.72S
 114 20  0  -22 57  6  15 47 53       44 105  1.05 179.0 183.58   0.67S
 114 30  0  -23  0 23  15 48  9       44 105  1.04 179.0 183.53   0.62S
 114 40  0  -23  3 38  15 48 26       44 105  1.03 178.9 183.48   0.58S
 114 50  0  -23  6 52  15 48 42       44 105  1.02 178.9 183.43   0.53S
 115  0  0  -23 10  5  15 48 58       45 105  1.01 178.8 183.39   0.48S
 115 10  0  -23 13 17  15 49 15       45 105  1.01 178.8 183.34   0.43S
 115 20  0  -23 16 27  15 49 31       45 105  1.00 178.7 183.29   0.38S
 115 30  0  -23 19 36  15 49 48       45 105  0.99 178.7 183.24   0.33S
 115 40  0  -23 22 44  15 50  4       46 105  0.98 178.6 183.19   0.28S
 115 50  0  -23 25 51  15 50 21       46 104  0.97 178.6 183.14   0.23S
 116  0  0  -23 28 56  15 50 38       46 104  0.97 178.5 183.09   0.18S

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  0.00km North, and 0.3 secs. later cf. primary.
Graze Path of component #3  228.00km North, and 807.0 secs. earlier cf. primary.

                Librations  Long -3.49   Lat +4.19
                            P +182.8     D +4.6
      Illumination of moon  88%-
        Elongation of Moon  140
    Vertical Profile Scale  1.86 km/arcsec at mean distance of moon
   Horizontal Scale Factor  1.35 deg/min

Limiting Magnitudes for various telescope apertures (in mm)
      CA\Tdia  50   100   150   200   250   300   350
    -3.8      2.5   3.9   4.7   5.2   5.5   5.7   5.8
    -1.8      2.5   3.9   4.7   5.2   5.5   5.7   5.8
     0.2      2.5   3.9   4.7   5.2   5.5   5.7   5.8
     2.2      2.5   3.9   4.7   5.2   5.5   5.7   5.8
     4.2      3.2   4.7   5.4   5.9   6.2   6.4   6.6
    

Lunar Limb Profile