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
148 0 0 -24 46 8 17 0 12 87 203 0.05 163.3 167.85 -15.08S
148 10 0 -24 43 19 17 0 38 87 209 0.05 163.2 167.76 -15.17S
148 20 0 -24 40 28 17 1 5 87 214 0.05 163.1 167.67 -15.26S
148 30 0 -24 37 34 17 1 31 87 218 0.05 163.1 167.58 -15.35S
148 40 0 -24 34 39 17 1 57 87 222 0.06 163.0 167.49 -15.44S
148 50 0 -24 31 40 17 2 24 87 225 0.06 162.9 167.40 -15.53S
149 0 0 -24 28 40 17 2 51 86 228 0.06 162.8 167.31 -15.62S
149 10 0 -24 25 37 17 3 17 86 230 0.06 162.7 167.22 -15.71S
149 20 0 -24 22 32 17 3 44 86 232 0.07 162.6 167.13 -15.81S
149 30 0 -24 19 25 17 4 11 86 234 0.07 162.5 167.03 -15.90S
149 40 0 -24 16 15 17 4 37 86 235 0.08 162.4 166.94 -15.99S
149 50 0 -24 13 3 17 5 4 85 237 0.08 162.3 166.85 -16.08S
150 0 0 -24 9 49 17 5 31 85 238 0.08 162.2 166.76 -16.17S
150 10 0 -24 6 33 17 5 58 85 239 0.09 162.1 166.68 -16.26S
150 20 0 -24 3 14 17 6 25 85 240 0.09 162.1 166.59 -16.35S
150 30 0 -23 59 52 17 6 52 85 240 0.10 162.0 166.50 -16.43S
150 40 0 -23 56 29 17 7 19 84 241 0.10 161.9 166.41 -16.52S
150 50 0 -23 53 3 17 7 46 84 242 0.10 161.8 166.32 -16.61S
151 0 0 -23 49 35 17 8 13 84 242 0.11 161.7 166.23 -16.70S
151 10 0 -23 46 4 17 8 40 84 243 0.11 161.6 166.14 -16.79S
151 20 0 -23 42 31 17 9 7 83 243 0.12 161.5 166.06 -16.88S
151 30 0 -23 38 56 17 9 35 83 244 0.12 161.4 165.97 -16.96S
151 40 0 -23 35 18 17 10 2 83 244 0.12 161.4 165.88 -17.05S
151 50 0 -23 31 38 17 10 29 83 245 0.13 161.3 165.79 -17.14S
152 0 0 -23 27 56 17 10 56 82 245 0.13 161.2 165.71 -17.23S
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 0.06km North, and 0.3 secs. later cf. primary.
Graze Path of component #3 68.66km North, and 1052.1 secs. earlier cf. primary.
Librations Long -4.30 Lat +4.20
P +165.4 D +3.3
Illumination of moon 89%-
Elongation of Moon 140
Vertical Profile Scale 1.86 km/arcsec at mean distance of moon
Horizontal Scale Factor 1.13 deg/min
Limiting Magnitudes for various telescope apertures (in mm)
CA\Tdia 50 100 150 200 250 300 350
-21.2 2.6 4.0 4.8 5.3 5.6 5.9 6.1
-19.2 2.6 4.0 4.8 5.3 5.6 5.9 6.1
-17.2 2.6 4.0 4.8 5.3 5.6 5.9 6.1
-15.2 2.6 4.0 4.8 5.3 5.6 5.9 6.1
-13.2 2.6 4.0 4.8 5.3 5.6 5.9 6.1
Lunar Limb Profile
