Predictions for Grazing Occultation of ZC 2745, 2012 November 17
Graze profile
Grazing Occultation of 2745wK1 Magnitude 6.8 [Red = 6.1]
Date: 2012 Nov 17 8h 28m, to 2012 Nov 17 8h 32m
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
173 0 0 -38 24 17 8 28 7 24 265 2.22 163.8 168.02 6.81S
173 10 0 -38 19 23 8 28 17 24 265 2.24 163.8 168.02 6.81S
173 20 0 -38 14 30 8 28 27 24 264 2.26 163.8 168.02 6.80S
173 30 0 -38 9 37 8 28 37 24 264 2.28 163.8 168.03 6.79S
173 40 0 -38 4 45 8 28 47 24 264 2.30 163.8 168.03 6.79S
173 50 1 -37 59 53 8 28 57 23 264 2.32 163.8 168.04 6.78S
174 0 1 -37 55 1 8 29 7 23 264 2.33 163.8 168.04 6.78S
174 10 1 -37 50 9 8 29 16 23 264 2.35 163.8 168.05 6.77S
174 20 1 -37 45 18 8 29 26 23 264 2.37 163.8 168.06 6.77S
174 30 1 -37 40 27 8 29 36 23 263 2.39 163.8 168.06 6.76S
174 40 1 -37 35 37 8 29 45 23 263 2.41 163.8 168.07 6.75S
174 50 1 -37 30 47 8 29 55 22 263 2.43 163.8 168.07 6.75S
175 0 1 -37 25 57 8 30 4 22 263 2.46 163.8 168.08 6.74S
175 10 2 -37 21 8 8 30 13 22 263 2.48 163.8 168.09 6.73S
175 20 2 -37 16 19 8 30 22 22 263 2.50 163.8 168.09 6.73S
175 30 2 -37 11 31 8 30 32 22 262 2.52 163.9 168.10 6.72S
175 40 2 -37 6 43 8 30 41 21 262 2.54 163.9 168.11 6.71S
175 50 2 -37 1 55 8 30 50 21 262 2.57 163.9 168.11 6.71S
176 0 2 -36 57 8 8 30 59 21 262 2.59 163.9 168.12 6.70S
176 10 2 -36 52 21 8 31 7 21 262 2.61 163.9 168.13 6.69S
176 20 2 -36 47 35 8 31 16 21 262 2.64 163.9 168.14 6.69S
176 30 3 -36 42 49 8 31 25 21 262 2.66 163.9 168.14 6.68S
176 40 3 -36 38 4 8 31 34 20 261 2.68 163.9 168.15 6.67S
176 50 3 -36 33 19 8 31 42 20 261 2.71 163.9 168.16 6.66S
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 3 meters [Estimated]
2745 is double:
AB 6.9 11.8 16.3" 35.9 (HO 569) Graze path of B 25.28 km south, and 22.6 secs later compared to A
Librations Long +4.47 Lat -5.61
P +167.66 D -4.31
Illumination of moon 16%+
Elongation of Moon 47
Vertical Profile Scale 2.39 km/arcsec at mean distance of moon
Horizontal Scale Factor 2.00 deg/min
At longitude 175.00:
Limiting Magnitudes for various telescope apertures (in cm)
CA\Tdia 5 10 15 20 25 30 35
2.7 5.2 6.6 7.4 7.9 8.2 8.4 8.6
4.7 5.2 6.7 7.4 7.9 8.2 8.5 8.7
6.7 5.3 6.7 7.5 8.0 8.3 8.5 8.7
8.7 6.2 7.6 8.4 9.0 9.4 9.6 9.9
10.7 6.2 7.7 8.5 9.0 9.4 9.7 9.9
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Double star catalogue details
WDS entries
RA Dec Name Y1 Y2 N PA PA Sep Sep M1 M2
18531-1838HO 569 1893 1998 5 45 37 12.0 15.8 6.9 11.8 K2III +007-026 -18 5115 D 185306.53-183812.4
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Interferometric catalogue entries
185306.53-183812.4 ADS 11776 HO 569A HD 174802 HIP 92682 18531-1838
Date PA Sep M1 M2
1978.3964 V 99.3 . 0.150 . . . 1.3 . 547 24 1 Rad1980 Occ
1978.5464 V 83.5 . . . . . . . 1 Evn1980 Occ
1991.25 . . < 0.1 . 6.92 . . . 511 222 0.3 1 HIP1997e Thp
1995.4425 . . < 0.055 . . . . . 549 22 2.5 1 Msn1996b Sch
1996.1844 . . < 0.035 . . . . . 549 22 4.0 1 Msn1996b Sch
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Results of Observer Scan UT
Site Long. Lat. Dist. h m s
Lunar Limb Profile
