Predictions for Grazing Occultation of ZC 2237, 2009 Apr 12
Grazing Occultation of 2237 K3 Magnitude 5.0 [Red = 4.3] s
R2237 = 42 Librae
Date: 2009 Apr 12 15h 16m, to 2009 Apr 12 15h 27m
Nominal site altitude 100m
E. Longit. Latitude U.T. Sun Moon TanZ PA AA CA
o ' " o ' " h m s Alt Alt Az o o o
171 30 0 -40 57 5 15 15 46 72 341 0.32 15.9 2.19 3.35N
171 40 0 -40 58 56 15 16 10 72 340 0.32 15.9 2.12 3.41N
171 50 0 -41 0 46 15 16 35 72 340 0.32 15.8 2.06 3.47N
172 0 0 -41 2 34 15 17 0 72 339 0.32 15.7 1.99 3.54N
172 10 0 -41 4 21 15 17 25 72 338 0.33 15.7 1.93 3.60N
172 20 1 -41 6 6 15 17 50 72 337 0.33 15.6 1.86 3.67N
172 30 1 -41 7 49 15 18 15 72 337 0.33 15.6 1.80 3.73N
172 40 1 -41 9 31 15 18 39 72 336 0.33 15.5 1.73 3.80N
172 50 1 -41 11 11 15 19 4 71 335 0.33 15.4 1.67 3.86N
173 0 1 -41 12 49 15 19 29 71 335 0.34 15.4 1.61 3.93N
173 10 1 -41 14 26 15 19 53 71 334 0.34 15.3 1.54 3.99N
173 20 1 -41 16 1 15 20 18 71 333 0.34 15.2 1.48 4.05N
173 30 1 -41 17 35 15 20 42 71 333 0.34 15.2 1.41 4.12N
173 40 2 -41 19 7 15 21 7 71 332 0.35 15.1 1.35 4.18N
173 50 2 -41 20 38 15 21 31 71 331 0.35 15.0 1.28 4.25N
174 0 2 -41 22 7 15 21 55 71 331 0.35 15.0 1.22 4.31N
174 10 2 -41 23 34 15 22 20 71 330 0.35 14.9 1.16 4.37N
174 20 2 -41 25 0 15 22 44 70 329 0.36 14.8 1.09 4.44N
174 30 2 -41 26 25 15 23 8 70 329 0.36 14.8 1.03 4.50N
174 40 2 -41 27 47 15 23 32 70 328 0.36 14.7 0.96 4.57N
174 50 2 -41 29 8 15 23 56 70 327 0.36 14.7 0.90 4.63N
175 0 3 -41 30 28 15 24 20 70 327 0.37 14.6 0.84 4.69N
175 10 3 -41 31 46 15 24 44 70 326 0.37 14.5 0.77 4.76N
175 20 3 -41 33 3 15 25 8 70 326 0.37 14.5 0.71 4.82N
175 30 3 -41 34 18 15 25 32 70 325 0.37 14.4 0.65 4.88N
175 40 3 -41 35 31 15 25 56 69 324 0.38 14.3 0.58 4.95N
175 50 3 -41 36 43 15 26 20 69 324 0.38 14.3 0.52 5.01N
176 0 3 -41 37 54 15 26 43 69 323 0.38 14.2 0.46 5.07N
Path coordinates are referred to WGS84 (as used by GPS), with the
nominal site altitude being referenced to Mean Sea Level.
Projected diameter of star 5 meters
2237 = NSV 20363, 4.94 to 5.02V
C A S S I N I R E G I O N G R A Z E
Librations Long +3.54 Lat +5.80
P +1.63 D -5.46
Illumination of moon 91%-
Elongation of Moon 144
Vertical Profile Scale 1.94 km/arcsec at mean distance of moon
Horizontal Scale Factor 1.29 deg/min
At longitude 173.83:
Limiting Magnitudes for various telescope apertures (in cm)
CA\Tdia 5 10 15 20 25 30 35
0.2 2.5 4.0 4.7 5.2 5.6 5.8 6.0
2.2 2.5 4.0 4.7 5.2 5.6 5.8 6.0
4.2 2.9 4.3 5.1 5.6 5.9 6.2 6.3
6.2 4.5 5.9 6.7 7.2 7.6 7.9 8.0
8.2 4.6 6.1 6.9 7.4 7.8 8.0 8.2
Lunar Limb Profile
