Predictions for Grazing Occultation of ZC 1925, 2006 Aug 28
Grazing Occultation of 1925 SB1 Magnitude 1.0v
1925 = Spica = alpha Virginis
Date 2006 August 28 (Monday) 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 12 0 -41 40 16 9 23 29 9 263 5.98 23.1 2.92 -0.67N
171 22 0 -41 38 59 9 23 32 9 263 6.07 23.1 2.89 -0.70N
171 32 0 -41 37 42 9 23 36 9 263 6.16 23.0 2.86 -0.73N
171 42 0 -41 36 25 9 23 39 9 263 6.26 23.0 2.83 -0.75N
171 52 0 -41 35 6 9 23 43 9 263 6.35 23.0 2.80 -0.78N
172 2 0 -41 33 47 9 23 46 9 263 6.46 23.0 2.78 -0.81N
172 12 0 -41 32 27 9 23 49 9 263 6.56 22.9 2.75 -0.84N
172 22 0 -41 31 7 9 23 53 9 263 6.67 22.9 2.72 -0.87N
172 32 0 -41 29 46 9 23 56 8 262 6.78 22.9 2.69 -0.89N
172 42 0 -41 28 24 9 23 59 8 262 6.89 22.9 2.67 -0.92N
172 52 0 -41 27 1 9 24 2 8 262 7.01 22.8 2.64 -0.95N
173 2 0 -41 25 38 9 24 5 8 262 7.13 22.8 2.61 -0.98N
173 12 0 -41 24 14 9 24 9 8 262 7.26 22.8 2.58 -1.00N
173 22 0 -41 22 50 9 24 12 8 262 7.39 22.7 2.56 -1.03N
173 32 0 -41 21 25 9 24 15 8 262 7.52 22.7 2.53 -1.06N
173 42 0 -41 19 59 9 24 18 7 262 7.66 22.7 2.50 -1.09N
173 52 0 -41 18 32 9 24 20 7 262 7.81 22.7 2.47 -1.11N
174 2 0 -41 17 5 9 24 23 7 261 7.96 22.6 2.45 -1.14N
174 12 0 -41 15 37 9 24 26 7 261 8.11 22.6 2.42 -1.17N
174 22 0 -41 14 9 9 24 29 7 261 8.27 22.6 2.39 -1.19N
174 32 0 -41 12 39 9 24 32 7 261 8.44 22.6 2.37 -1.22N
174 42 0 -41 11 10 9 24 34 7 261 8.62 22.5 2.34 -1.25N
174 52 0 -41 9 39 9 24 37 6 261 8.80 22.5 2.31 -1.27N
175 2 0 -41 8 8 9 24 40 6 261 8.99 22.5 2.29 -1.30N
175 12 0 -41 6 36 9 24 42 6 261 9.19 22.4 2.26 -1.32N
175 22 0 -41 5 4 9 24 45 6 260 9.40 22.4 2.24 -1.35N
175 32 0 -41 3 30 9 24 47 6 260 9.61 22.4 2.21 -1.38N
175 42 0 -41 1 57 9 24 50 6 260 9.84 22.4 2.18 -1.40N
175 52 1 -41 0 22 9 24 52 6 260 10.08 22.3 2.16 -1.43N
176 2 1 -40 58 47 9 24 55 6 260 10.33 22.3 2.13 -1.45N
176 12 1 -40 57 11 9 24 57 5 260 10.59 22.3 2.11 -1.48N
Path coordinates are referred to WGS84 (as used by GPS).
1925 is multiple : 1.3 4.5 0.050" 225.0 : 1.3 7.5 0.50" 180.0 : 0.9 12.0 148" 32.0
Graze Path of component #2 0.08km North, and 0.0 secs. earlier cf. primary.
Graze Path of component #3 0.85km North, and 0.4 secs. later cf. primary.
Graze Path of component #4 266.95km South, and 51.0 secs. later cf. primary.
1925 = alf Vir, 0.95 +/- 0.10 V , Type ELL+BCEP, Period 4.014604 days, Phase 0.25
C A S S I N I R E G I O N G R A Z E
Librations Long -4.86 Lat +3.01
P +1.9 D -2.9
Illumination of moon 17%+
Elongation of Moon 49
Vertical Profile Scale 1.92 km/arcsec at mean distance of moon
Horizontal Scale Factor 1.89 deg/min
Limiting Magnitudes for various telescope apertures (in mm)
CA\Tdia 50 100 150 200 250 300 350
-5.5 1.7 2.9 3.3 3.5 3.7 3.7 3.8
-3.5 1.7 2.9 3.3 3.5 3.7 3.7 3.8
-1.5 1.7 2.9 3.3 3.5 3.7 3.7 3.8
0.5 4.1 5.4 6.1 6.5 6.8 7.0 7.1
2.5 4.1 5.5 6.2 6.6 6.9 7.1 7.2
Lunar Limb Profile for graze near Blenheim and Wellington
