Predictions for Grazing Occultation of ZC 1925, 2013 Jan 5
Graze profile
Grazing Occultation of 1925SB1 Magnitude 1.0 [Red = 1.1] e
R1925 = Spica = alpha Virginis
Date: 2013 Jan 05 20h 42m, to 2013 Jan 05 20h 51m
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
174 0 0 -36 57 28 20 42 20 39 54 307 0.74 22.3 359.24 -0.90N
174 10 0 -36 59 35 20 42 40 39 53 307 0.74 22.3 359.19 -0.85N
174 20 0 -37 1 41 20 42 59 40 53 307 0.75 22.2 359.15 -0.80N
174 30 0 -37 3 46 20 43 19 40 53 306 0.75 22.2 359.10 -0.76N
174 40 0 -37 5 49 20 43 38 40 53 306 0.76 22.1 359.05 -0.71N
174 50 1 -37 7 51 20 43 58 40 53 306 0.76 22.1 359.01 -0.67N
175 0 1 -37 9 52 20 44 17 40 53 306 0.77 22.0 358.96 -0.62N
175 10 1 -37 11 52 20 44 36 41 52 305 0.77 22.0 358.91 -0.57N
175 20 1 -37 13 50 20 44 55 41 52 305 0.78 22.0 358.88 -0.54N
175 30 1 -37 15 47 20 45 14 41 52 305 0.78 21.9 358.83 -0.49N
175 40 1 -37 17 43 20 45 33 41 52 305 0.79 21.9 358.78 -0.44N
175 50 1 -37 19 38 20 45 51 41 52 304 0.79 21.8 358.74 -0.40N
176 0 1 -37 21 31 20 46 10 42 51 304 0.80 21.8 358.69 -0.35N
176 10 2 -37 23 24 20 46 29 42 51 304 0.80 21.7 358.65 -0.30N
176 20 2 -37 25 15 20 46 47 42 51 304 0.81 21.7 358.60 -0.26N
176 30 2 -37 27 5 20 47 6 42 51 303 0.81 21.6 358.55 -0.21N
176 40 2 -37 28 53 20 47 24 42 51 303 0.82 21.6 358.51 -0.17N
176 50 2 -37 30 41 20 47 42 43 51 303 0.82 21.5 358.46 -0.12N
177 0 2 -37 32 27 20 48 1 43 50 303 0.83 21.5 358.42 -0.08N
177 10 2 -37 34 12 20 48 19 43 50 302 0.83 21.4 358.37 -0.03N
177 20 2 -37 35 57 20 48 37 43 50 302 0.84 21.4 358.33 0.01N
177 30 3 -37 37 39 20 48 55 43 50 302 0.84 21.4 358.28 0.06N
177 40 3 -37 39 21 20 49 13 44 50 302 0.85 21.3 358.24 0.10N
177 50 3 -37 41 2 20 49 30 44 50 301 0.85 21.3 358.19 0.15N
178 0 3 -37 42 41 20 49 48 44 49 301 0.86 21.2 358.15 0.19N
178 10 3 -37 44 19 20 50 6 44 49 301 0.86 21.2 358.10 0.24N
178 20 3 -37 45 56 20 50 23 44 49 301 0.87 21.1 358.06 0.28N
178 30 3 -37 47 32 20 50 41 44 49 300 0.87 21.1 358.01 0.33N
178 40 3 -37 49 7 20 50 58 45 49 300 0.88 21.0 357.97 0.37N
178 50 3 -37 50 41 20 51 16 45 48 300 0.89 21.0 357.93 0.41N
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 2 meters [CHARM/CADARS, 6 measures]
1925 is variable:
1925 = alf Vir, 0.95, range 0.1, V, Type EA+BCEP, Period 4.014604 days, Phase 52 %
1925 is triple:
AB 1.0 12.0 153" 33.0 (BUP 150) Graze path of B 301.23 km south, and 74.4 secs later compared to A
AC 1.0 10.5 367" 60.9 (BUP 150) Graze path of C 571.78 km south, and 573.6 secs later compared to A
C A S S I N I R E G I O N G R A Z E
Librations Long -6.46 Lat +3.07
P +358.24 D -2.65
Illumination of moon 43%-
Elongation of Moon 82
Vertical Profile Scale 1.96 km/arcsec at mean distance of moon
Horizontal Scale Factor 1.46 deg/min
At longitude 176.50:
Limiting Magnitudes for various telescope apertures (in cm)
CA\Tdia 5 10 15 20 25 30 35
-4.2 2.1 3.6 4.3 4.8 5.1 5.3 5.5
-2.2 2.1 3.6 4.3 4.8 5.1 5.3 5.5
-0.2 2.1 3.6 4.3 4.8 5.1 5.3 5.5
1.8 3.0 4.4 5.1 5.6 5.9 6.2 6.3
3.8 3.0 4.4 5.1 5.6 5.9 6.2 6.3
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Results of Observer Scan UT
Site Long. Lat. Dist. h m s
Auckland 174.8 -36.9 24km 20 43 54
MidNZ 173.0 -41.0 454km 20 40 21
Lunar Limb Profile
