Predictions for Grazing Occultation of ZC 2118, 2013 Mar 2
Graze profile
Grazing Occultation of 2118SA3 Magnitude 2.8 [Red = 2.7] s
R2118 = Zubenelgenubi = alpha Librae
Date: 2013 Mar 02 21h 24m, to 2013 Mar 02 21h 29m
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 0 0 -41 41 48 21 24 26 33 25 271 2.11 7.8 349.40 9.07N
171 10 0 -41 39 57 21 24 34 33 25 270 2.12 7.8 349.38 9.08N
171 20 0 -41 38 6 21 24 43 34 25 270 2.13 7.8 349.36 9.10N
171 30 0 -41 36 13 21 24 51 34 25 270 2.15 7.8 349.34 9.12N
171 40 0 -41 34 20 21 24 59 34 25 270 2.16 7.8 349.32 9.14N
171 50 1 -41 32 27 21 25 7 34 25 270 2.18 7.8 349.30 9.16N
172 0 1 -41 30 33 21 25 15 34 25 270 2.19 7.7 349.28 9.18N
172 10 1 -41 28 38 21 25 22 34 24 270 2.21 7.7 349.27 9.20N
172 20 1 -41 26 43 21 25 30 34 24 269 2.22 7.7 349.25 9.21N
172 30 1 -41 24 48 21 25 38 35 24 269 2.24 7.7 349.23 9.23N
172 40 1 -41 22 51 21 25 46 35 24 269 2.26 7.7 349.21 9.25N
172 50 1 -41 20 55 21 25 53 35 24 269 2.27 7.6 349.19 9.27N
173 0 1 -41 18 57 21 26 1 35 24 269 2.29 7.6 349.17 9.29N
173 10 2 -41 16 59 21 26 9 35 23 269 2.30 7.6 349.16 9.30N
173 20 2 -41 15 1 21 26 16 35 23 269 2.32 7.6 349.14 9.32N
173 30 2 -41 13 2 21 26 24 35 23 268 2.34 7.6 349.12 9.34N
173 40 2 -41 11 2 21 26 31 36 23 268 2.36 7.6 349.10 9.36N
173 50 2 -41 9 2 21 26 38 36 23 268 2.37 7.5 349.09 9.38N
174 0 2 -41 7 2 21 26 46 36 23 268 2.39 7.5 349.07 9.39N
174 10 2 -41 5 0 21 26 53 36 23 268 2.41 7.5 349.05 9.41N
174 20 2 -41 2 59 21 27 0 36 22 268 2.43 7.5 349.03 9.43N
174 30 3 -41 0 56 21 27 8 36 22 268 2.44 7.5 349.02 9.44N
174 40 3 -40 58 53 21 27 15 36 22 267 2.46 7.4 349.00 9.46N
174 50 3 -40 56 50 21 27 22 37 22 267 2.48 7.4 348.98 9.48N
175 0 3 -40 54 46 21 27 29 37 22 267 2.50 7.4 348.97 9.50N
175 10 3 -40 52 42 21 27 36 37 22 267 2.52 7.4 348.95 9.51N
175 20 3 -40 50 37 21 27 43 37 22 267 2.54 7.4 348.93 9.53N
175 30 3 -40 48 31 21 27 50 37 21 267 2.56 7.4 348.92 9.55N
175 40 3 -40 46 25 21 27 57 37 21 267 2.58 7.3 348.90 9.56N
175 50 3 -40 44 19 21 28 4 38 21 266 2.60 7.3 348.88 9.58N
176 0 4 -40 42 12 21 28 10 38 21 266 2.62 7.3 348.87 9.60N
176 10 4 -40 40 4 21 28 17 38 21 266 2.64 7.3 348.85 9.61N
176 20 4 -40 37 56 21 28 24 38 21 266 2.66 7.3 348.83 9.63N
176 30 4 -40 35 48 21 28 30 38 20 266 2.68 7.3 348.82 9.64N
176 40 4 -40 33 39 21 28 37 38 20 266 2.70 7.2 348.80 9.66N
176 50 4 -40 31 29 21 28 44 38 20 266 2.72 7.2 348.78 9.68N
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, 2 measures]
2118 is variable:
2118 = NSV 6827, 2.72 to 2.75, V
2118 is quadruple:
AB 2.7 5.2 231" 315.1 (SHJ 186) Graze path of B 296.72 km south, and 352.5 secs earlier compared to A
AC 2.7 13.2 274" 291.0 (AOT 53) Graze path of C 134.31 km south, and 511.6 secs earlier compared to A
AD 2.7 7.3 1000" 266.0 (SHY 75) Graze path of D 420.33 km north, and 1884.0 secs earlier compared to A
Librations Long -3.47 Lat +0.07
P +349.10 D +0.85
Illumination of moon 73%-
Elongation of Moon 117
Vertical Profile Scale 2.04 km/arcsec at mean distance of moon
Horizontal Scale Factor 1.86 deg/min
At longitude 174.00:
Limiting Magnitudes for various telescope apertures (in cm)
CA\Tdia 5 10 15 20 25 30 35
5.4 2.4 3.8 4.4 4.8 5.0 5.2 5.3
7.4 2.8 4.1 4.8 5.2 5.4 5.6 5.7
9.4 2.8 4.1 4.8 5.2 5.4 5.6 5.7
11.4 2.8 4.1 4.8 5.2 5.4 5.6 5.7
13.4 2.8 4.1 4.8 5.2 5.4 5.6 5.7
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Double star catalogue details
WDS entries
RA Dec Name Y1 Y2 N PA PA Sep Sep M1 M2
14509-1603SHJ 186AB 1836 2002 30 314 315 229.0 231.1 2.74 5.19 A3IV F4IV -106-068 -15 3966 NZD 145052.78-160229.8
14509-1603AOT 53AC 1987 1998 2 291 291 277.9 276.1 2.74 13.2 A3IV -106-068 N D 145052.78-160229.8
14509-1603CAB 1AD 1991 1999 3 266 266 999.9 999.9 2.74 7.31 A3IV G6V -106-068 -116-065 NVD 145052.78-160229.8
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Interferometric catalogue entries
145052.78-160229.8 alp 2 Lib SHJ 186A HD 130841 HIP 72622 14509-1603
Date PA Sep M1 M2
1979.537 . . < 0.030 . . . . . 470 3.8 1 Hrt1984 Sc
1980.485 . . < 0.025 . . . . . 400 3.8 1 Hrt1984 Sc
145052.78-160229.8 BDS 7018 SHJ 186AB HD 130841 HIP 72622 14509-1603 N
Date PA Sep M1 M2
1991.25 314.0 . 230.738 . 2.75 . 5.15 . 550 0.3 1 HIP1997b Hh
1991.75 314.0 . 230.77 . 2.742 0.009 5.194 0.009 530 100 1.4 1 TYC2002 Ht
1991.75 . . . . 2.930 0.014 5.609 0.014 430 90 1.4 1 TYC2002 Ht
145052.78-160229.8 BDS 7018 SHY 75AD HD 130841 HIP 72622 14509-1603 N
Date PA Sep M1 M2
1991.25 266.1 . M149.625 . 2.75 . 7.24 . 550 0.3 1 HIP1997a Hh
1991.66 266.1 . M149.625 . 2.742 0.009 7.313 0.012 530 100 1.4 1 TYC2002 Ht
1991.66 . . . . 2.930 0.014 8.142 0.017 430 90 1.4 1 TYC2002 Ht
1999.36 266.2 . M149.728 . 2.467 0.276 5.947 0.021 1256 245 1.3 1 TMA2003 E2
1999.36 . . . . 2.439 0.184 5.629 0.018 1633 160 1.3 1 TMA2003 E2
1999.36 . . . . 2.440 0.280 5.531 0.018 2210 200 1.3 1 TMA2003 E2
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AAVSO Variable star entry
Variable identifier Type Max Min Ph Epoch Period
NSV 6827 2.72 2.75 V
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Results of Observer Scan UT
Site Long. Lat. Dist. h m s
Chch graze 172.6 -43.5 230km 21 25 44
MidNZ 173.0 -41.0 34km 21 26 1
Wellington 174.8 -41.3 37km 21 27 20
Lunar Limb Profile
