Predictions for Grazing Occultation of ZC 2118, 2013 Feb 3
Graze profile
Grazing Occultation of 2118SA3 Magnitude 2.8 [Red = 2.7] s
R2118 = Zubenelgenubi = alpha Librae
Date: 2013 Feb 03 13h 38m, to 2013 Feb 03 13h 44m
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 -39 22 0 13 38 8 25 91 2.14 18.9 0.44 -1.94N
174 10 0 -39 26 54 13 38 19 25 91 2.12 18.9 0.45 -1.95N
174 20 0 -39 31 48 13 38 30 25 90 2.11 18.9 0.46 -1.96N
174 30 0 -39 36 42 13 38 42 26 90 2.09 18.9 0.46 -1.96N
174 40 0 -39 41 37 13 38 53 26 90 2.08 18.9 0.47 -1.97N
174 50 1 -39 46 33 13 39 4 26 90 2.06 18.9 0.48 -1.98N
175 0 1 -39 51 29 13 39 16 26 90 2.05 19.0 0.49 -1.99N
175 10 1 -39 56 26 13 39 27 26 90 2.03 19.0 0.49 -1.99N
175 20 1 -40 1 23 13 39 39 26 89 2.02 19.0 0.50 -2.00N
175 30 1 -40 6 20 13 39 50 27 89 2.00 19.0 0.51 -2.01N
175 40 1 -40 11 18 13 40 2 27 89 1.99 19.0 0.52 -2.02N
175 50 1 -40 16 16 13 40 14 27 89 1.97 19.0 0.52 -2.02N
176 0 1 -40 21 15 13 40 26 27 89 1.96 19.0 0.53 -2.03N
176 10 2 -40 26 14 13 40 38 27 88 1.95 19.0 0.54 -2.04N
176 20 2 -40 31 14 13 40 50 27 88 1.93 19.0 0.54 -2.04N
176 30 2 -40 36 14 13 41 2 28 88 1.92 19.0 0.55 -2.05N
176 40 2 -40 41 14 13 41 14 28 88 1.91 19.0 0.56 -2.06N
176 50 2 -40 46 15 13 41 26 28 88 1.89 19.0 0.56 -2.06N
177 0 2 -40 51 16 13 41 39 28 88 1.88 19.0 0.57 -2.07N
177 10 2 -40 56 18 13 41 51 28 87 1.87 19.0 0.57 -2.07N
177 20 2 -41 1 20 13 42 3 28 87 1.85 19.0 0.58 -2.08N
177 30 3 -41 6 22 13 42 16 28 87 1.84 19.1 0.59 -2.09N
177 40 3 -41 11 25 13 42 29 29 87 1.83 19.1 0.59 -2.09N
177 50 3 -41 16 28 13 42 41 29 87 1.82 19.1 0.60 -2.10N
178 0 3 -41 21 32 13 42 54 29 86 1.81 19.1 0.60 -2.10N
178 10 3 -41 26 35 13 43 7 29 86 1.79 19.1 0.61 -2.11N
178 20 3 -41 31 39 13 43 20 29 86 1.78 19.1 0.61 -2.11N
178 30 3 -41 36 44 13 43 33 29 86 1.77 19.1 0.62 -2.12N
178 40 3 -41 41 48 13 43 46 30 86 1.76 19.1 0.62 -2.12N
178 50 3 -41 46 53 13 43 59 30 85 1.75 19.1 0.62 -2.12N
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 [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 263.57 km south, and 397.9 secs earlier compared to A
AC 2.7 13.2 274" 291.0 (AOT 53) Graze path of C 24.60 km south, and 523.7 secs earlier compared to A
AD 2.7 7.3 1000" 266.0 (SHY 75) Graze path of D 1014.55 km north, and 1762.5 secs earlier compared to A
Librations Long -3.51 Lat +0.11
P +0.56 D +0.12
Illumination of moon 50%-
Elongation of Moon 90
Vertical Profile Scale 2.52 km/arcsec at mean distance of moon
Horizontal Scale Factor 1.87 deg/min
At longitude 176.50:
Limiting Magnitudes for various telescope apertures (in cm)
CA\Tdia 5 10 15 20 25 30 35
-6.1 3.0 4.4 5.1 5.5 5.7 5.9 6.0
-4.1 3.0 4.4 5.1 5.5 5.7 5.9 6.0
-2.1 3.0 4.4 5.1 5.5 5.7 5.9 6.0
-0.1 3.0 4.4 5.1 5.5 5.7 5.9 6.0
1.9 4.8 6.2 6.9 7.4 7.7 7.9 8.0
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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
Auckland 174.8 -36.9 270km 13 39 2
Chch graze 172.6 -43.5 446km 13 36 41
MidNZ 173.0 -41.0 198km 13 37 4
Wellington 174.8 -41.3 143km 13 39 2
Lunar Limb Profile
