Grazing Occultation of     552 SB7      Magnitude   2.9s
  552 = Alcyone = eta Tauri                   

Date   2007 helmikuu 23    (perjantai)     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
  20  0  0   65 25 25  23 50 37       12 301  4.55 170.6 182.89  -3.52S
  20 30  0   65 10 15  23 50 51       12 302  4.68 170.6 182.92  -3.55S
  21  0  0   64 54 55  23 51  4       12 302  4.82 170.7 182.96  -3.59S
  21 30  0   64 39 26  23 51 17       11 303  4.97 170.7 183.00  -3.63S
  22  0  0   64 23 48  23 51 30       11 304  5.13 170.7 183.04  -3.67S
  22 30  0   64  8  0  23 51 43       11 304  5.30 170.8 183.08  -3.71S
  23  0  0   63 52  4  23 51 55       10 305  5.48 170.8 183.12  -3.75S
  23 30  0   63 35 59  23 52  7       10 305  5.68 170.8 183.16  -3.78S
  24  0  0   63 19 46  23 52 19       10 306  5.89 170.9 183.20  -3.82S
  24 30  0   63  3 25  23 52 30        9 306  6.13 170.9 183.23  -3.86S
  25  0  0   62 46 56  23 52 41        9 307  6.38 171.0 183.27  -3.90S

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

    552 is multiple :
        1.5   0.031"  207.1 :
   3.0  4.6   0.031"  207.1 :
   2.8  6.2  117"  290.0
Graze Path of component #2  0.08km North, and 0.0 secs. earlier cf. primary.
Graze Path of component #3  0.08km North, and 0.0 secs. earlier cf. primary.
Graze Path of component #4  173.58km South, and 162.6 secs. earlier cf. primary.

    552 = NSV 15775,   2.87 +/- 0.00 V ,  Type VAR:

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

                Librations  Long +4.83   Lat -5.79
                            P +182.8     D -5.8
      Illumination of moon  46%+
        Elongation of Moon  85
    Vertical Profile Scale  2.96 km/arcsec at mean distance of moon
   Horizontal Scale Factor  2.24 deg/min

Limiting Magnitudes for various telescope apertures (in mm)
      CA\Tdia  50   100   150   200   250   300   350
    -7.9      2.2   3.5   4.0   4.2   4.4   4.5   4.5
    -5.9      2.2   3.5   4.0   4.2   4.4   4.5   4.5
    -3.9      2.2   3.5   4.0   4.2   4.4   4.5   4.5
    -1.9      2.2   3.5   4.0   4.2   4.4   4.5   4.5
     0.1      2.8   4.0   4.6   4.8   5.0   5.1   5.2