Predictions for Grazing Occultation of ZC 947, 2015 Jan 31
Graze profile
Grazing Occultation of 947SF6 Magnitude 5.2 [Red = 5.0]
R947 = 71 Orionis
Date: 2015 Jan 31 15h 23m, to 2015 Jan 31 15h 41m
Nominal site altitude 50m
E. Longit. Latitude U.T. Sun Moon TanZ PA AA CA
o ' " o ' " h m s Alt Alt Az o o o
135 0 0 -23 29 45 15 22 32 31 312 1.68 11.2 9.96 15.47N
135 30 0 -23 42 8 15 23 17 30 312 1.72 11.3 9.98 15.49N
136 0 0 -23 54 32 15 24 2 30 311 1.76 11.3 10.00 15.52N
136 30 0 -24 6 58 15 24 45 29 311 1.81 11.3 10.02 15.53N
137 0 0 -24 19 26 15 25 27 28 311 1.85 11.3 10.04 15.55N
137 30 0 -24 31 55 15 26 8 28 310 1.90 11.3 10.05 15.57N
138 0 0 -24 44 24 15 26 48 27 310 1.95 11.4 10.06 15.58N
138 30 0 -24 56 55 15 27 27 27 309 2.00 11.4 10.07 15.59N
139 0 0 -25 9 25 15 28 5 26 309 2.05 11.4 10.08 15.59N
139 30 0 -25 21 57 15 28 42 25 309 2.11 11.4 10.08 15.60N
140 0 0 -25 34 28 15 29 18 25 308 2.16 11.4 10.09 15.60N
140 30 0 -25 46 59 15 29 53 24 308 2.22 11.4 10.09 15.60N
141 0 0 -25 59 30 15 30 27 24 308 2.28 11.4 10.09 15.60N
141 30 0 -26 12 1 15 31 0 23 307 2.35 11.4 10.08 15.60N
142 0 0 -26 24 32 15 31 32 22 307 2.42 11.4 10.08 15.59N
142 30 0 -26 37 1 15 32 4 22 307 2.49 11.4 10.07 15.59N
143 0 0 -26 49 30 15 32 34 21 306 2.56 11.4 10.07 15.58N
143 30 0 -27 1 58 15 33 3 21 306 2.64 11.3 10.06 15.57N
144 0 0 -27 14 26 15 33 32 20 305 2.72 11.3 10.05 15.56N
144 30 0 -27 26 52 15 33 59 20 305 2.80 11.3 10.03 15.55N
145 0 0 -27 39 16 15 34 26 19 305 2.89 11.3 10.02 15.53N
145 30 0 -27 51 40 15 34 52 19 304 2.99 11.3 10.00 15.52N
146 0 0 -28 4 1 15 35 17 18 304 3.09 11.3 9.99 15.50N
146 30 0 -28 16 22 15 35 41 17 304 3.19 11.3 9.97 15.48N
147 0 0 -28 28 41 15 36 4 17 304 3.30 11.2 9.95 15.46N
147 30 0 -28 40 57 15 36 26 16 303 3.42 11.2 9.93 15.44N
148 0 0 -28 53 12 15 36 48 16 303 3.55 11.2 9.91 15.42N
148 30 0 -29 5 26 15 37 9 15 303 3.68 11.2 9.89 15.40N
149 0 0 -29 17 36 15 37 29 15 302 3.82 11.2 9.87 15.38N
149 30 0 -29 29 45 15 37 48 14 302 3.97 11.1 9.84 15.35N
150 0 0 -29 41 52 15 38 7 14 302 4.14 11.1 9.82 15.33N
150 30 0 -29 53 56 15 38 24 13 301 4.31 11.1 9.79 15.30N
151 0 0 -30 5 58 15 38 41 13 301 4.50 11.1 9.76 15.28N
151 30 0 -30 17 58 15 38 58 12 301 4.70 11.0 9.74 15.25N
152 0 0 -30 29 56 15 39 13 11 300 4.92 11.0 9.71 15.22N
152 30 0 -30 41 51 15 39 28 11 300 5.16 11.0 9.68 15.19N
153 0 0 -30 53 43 15 39 42 10 300 5.42 10.9 9.65 15.16N
153 30 0 -31 5 33 15 39 56 10 300 5.70 10.9 9.62 15.13N
154 0 0 -31 17 20 15 40 8 9 299 6.02 10.9 9.59 15.10N
154 30 0 -31 29 4 15 40 20 9 299 6.36 10.9 9.56 15.07N
155 0 0 -31 40 46 15 40 32 8 299 6.75 10.8 9.53 15.04N
Path coordinates are referred to WGS84 (as used by GPS), with the
nominal site altitude being referenced to Mean Sea Level. The path
is adjusted for the effects of refraction at low moon altitudes.
Projected diameter of star 1 meters [Estimated]
947 is quadruple:
AB 5.2 11.2 7.2" 185.5 (HJ 2302) Graze path of B 15.79 km north, and 1.8 secs later compared to A
AC 5.2 12.5 65" 283.6 (HJ 2302) Graze path of C 5.68 km south, and 161.6 secs earlier compared to A
AD 5.2 12.0 71" 265.4 (HJ 2302) Graze path of D 42.47 km north, and 168.9 secs earlier compared to A
Librations Long +4.62 Lat +6.00
P +10.49 D -4.84
Illumination of moon 89%+
Elongation of Moon 142
Vertical Profile Scale 2.27 km/arcsec at mean distance of moon
Horizontal Scale Factor 1.53 deg/min
At longitude 145.00:
Limiting Magnitudes for various telescope apertures (in cm)
CA\Tdia 5 10 15 20 25 30 35
11.5 4.5 5.9 6.6 7.0 7.2 7.4 7.5
13.5 4.9 6.3 7.0 7.4 7.7 7.8 7.9
15.5 5.0 6.3 7.0 7.4 7.7 7.8 8.0
17.5 5.0 6.3 7.0 7.4 7.7 7.9 8.0
19.5 5.0 6.3 7.0 7.4 7.7 7.9 8.0
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Results of Observer Scan UT
Site Long. Lat. Dist. h m s
AU Mid 143.0 -30.6 377km 15 32 34
Newcastle 151.7 -33.0 257km 15 39 4
Pt Macquarie 152.8 -31.4 57km 15 39 37
Lunar Limb Profile
