Predictions for Grazing Occultation of ZC 2750, 2007 July 28

Grazing Occultation of    2750 SB2      Magnitude   2.0 
 2750 = Nunki = sigma Sagittarii              

Date   2007 July 28    (Saturday)     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
 171  0  0  -42 48 22   4 10 35    12  8 119  7.59 359.8   4.61  14.23N
 171 10  0  -42 53 47   4 10 38    12  8 119  7.43 359.7   4.60  14.23N
 171 20  0  -42 59 11   4 10 41    12  8 119  7.28 359.7   4.60  14.22N
 171 30  0  -43  4 36   4 10 45    11  8 119  7.13 359.7   4.59  14.22N
 171 40  0  -43 10  0   4 10 48    11  8 119  6.99 359.7   4.59  14.21N
 171 50  0  -43 15 25   4 10 51    11  8 118  6.85 359.7   4.58  14.21N
 172  0  0  -43 20 49   4 10 54    11  8 118  6.72 359.7   4.57  14.20N
 172 10  0  -43 26 13   4 10 58    11  9 118  6.60 359.7   4.57  14.19N
 172 20  0  -43 31 37   4 11  1    11  9 118  6.48 359.7   4.56  14.19N
 172 30  0  -43 37  0   4 11  5    10  9 118  6.36 359.7   4.56  14.18N
 172 40  0  -43 42 23   4 11  8    10  9 118  6.25 359.7   4.55  14.18N
 172 50  0  -43 47 46   4 11 12    10  9 118  6.14 359.7   4.55  14.17N
 173  0  0  -43 53  9   4 11 15    10  9 118  6.04 359.7   4.54  14.16N
 173 10  0  -43 58 32   4 11 19    10 10 117  5.93 359.7   4.53  14.16N

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 0.2 secs. later cf. primary.
Graze Path of component #3  304.01km North, and 481.5 secs. earlier cf. primary.

    C A S S I N I   R E G I O N   G R A Z E

                Librations  Long -4.24   Lat +4.98
                            P +4.2     D -5.0
      Illumination of moon  96%+
        Elongation of Moon  157
    Vertical Profile Scale  2.28 km/arcsec at mean distance of moon
   Horizontal Scale Factor  2.14 deg/min

Limiting Magnitudes for various telescope apertures (in mm)
      CA\Tdia  50   100   150   200   250   300   350
    10.2      0.9   2.1   2.6   2.8   3.0   3.0   3.1
    12.2      1.1   2.3   2.8   3.0   3.2   3.3   3.3
    14.2      1.1   2.3   2.8   3.1   3.2   3.3   3.4
    16.2      1.2   2.4   2.9   3.1   3.3   3.4   3.4
    18.2      1.2   2.4   2.9   3.2   3.3   3.4   3.5

Lunar Limb Profile