Predictions for Grazing Occultation of ZC 1925, 2013 May 22 near Nambour, Qld
Graze profile
Grazing Occultation of 1925SB1 Magnitude 1.0 [Red = 1.1] e
R1925 = Spica = alpha Virginis
Date: 2013 May 22 10h 1m, to 2013 May 22 10h 18m
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
149 0 0 12 52 52 10 1 4 58 137 0.64 29.8 6.63 11.06N
149 30 0 12 34 23 10 2 23 58 138 0.62 29.8 6.67 11.09N
150 0 0 12 15 49 10 3 43 59 138 0.60 29.9 6.70 11.13N
150 30 0 11 57 12 10 5 4 60 139 0.58 29.9 6.73 11.16N
151 0 0 11 38 31 10 6 27 61 140 0.56 29.9 6.76 11.19N
151 30 0 11 19 48 10 7 51 61 141 0.55 29.9 6.78 11.20N
152 0 0 11 1 1 10 9 16 62 142 0.53 30.0 6.79 11.22N
152 30 0 10 42 13 10 10 43 63 143 0.51 30.0 6.80 11.23N
153 0 0 10 23 24 10 12 11 64 144 0.50 30.0 6.81 11.23N
153 30 0 10 4 33 10 13 41 64 146 0.48 30.0 6.80 11.23N
154 0 0 9 45 43 10 15 12 65 147 0.46 30.0 6.80 11.23N
154 30 0 9 26 53 10 16 44 66 148 0.45 30.0 6.79 11.21N
155 0 0 9 8 4 10 18 17 67 150 0.43 29.9 6.77 11.19N
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 54 %
1925 is triple:
AB 1.0 12.0 153" 33.0 (BUP 150) Graze path of B 308.39 km south, and 21.7 secs later compared to A
AC 1.0 10.5 367" 60.9 (BUP 150) Graze path of C 636.60 km south, and 504.9 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 -5.82 Lat +2.90
P +6.50 D -3.31
Illumination of moon 90%+
Elongation of Moon 142
Vertical Profile Scale 1.94 km/arcsec at mean distance of moon
Horizontal Scale Factor 1.32 deg/min
At longitude 152.00:
Limiting Magnitudes for various telescope apertures (in cm)
CA\Tdia 5 10 15 20 25 30 35
7.2 4.6 6.1 6.9 7.4 7.7 8.0 8.2
9.2 4.6 6.1 6.9 7.4 7.7 8.0 8.2
11.2 4.9 6.4 7.2 7.7 8.1 8.3 8.5
13.2 5.5 7.0 7.8 8.3 8.7 9.0 9.2
15.2 5.6 7.0 7.8 8.3 8.7 9.0 9.2
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Double star catalogue details
WDS entries
RA Dec Name Y1 Y2 N PA PA Sep Sep M1 M2
13252-1110BUP 150AB 1879 2007 4 33 33 144.4 152.5 0.98 12.0 -041-028 -10 3672 N D 132511.58-110940.4
13252-1110BUP 150AC 1879 1999 2 62 61 359.8 366.6 0.98 10.5 -043-032 N D 132511.58-110940.4
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Interferometric catalogue entries
132511.60-110940.5 HR 5056 alp Vir HD 116658 HIP 65474 13252-1110 N
Date PA Sep M1 M2
1975. V180. . 0.5 . 1.3 . 7.5 . 1 OCC2002 O
1975. V225. . 0.05 . 1.3 . 4.5 . 1 OCC2002 O
1988.166 . . Grazing Occultation of 1925SB1 Magnitude 1.0 [Red = 1.1] e
R1925 = Spica = alpha Virginis
Date: 2013 May 22 10h 1m, to 2013 May 22 10h 18m
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
149 0 0 12 52 52 10 1 4 58 137 0.64 29.8 6.63 11.06N
149 30 0 12 34 23 10 2 23 58 138 0.62 29.8 6.67 11.09N
150 0 0 12 15 49 10 3 43 59 138 0.60 29.9 6.70 11.13N
150 30 0 11 57 12 10 5 4 60 139 0.58 29.9 6.73 11.16N
151 0 0 11 38 31 10 6 27 61 140 0.56 29.9 6.76 11.19N
151 30 0 11 19 48 10 7 51 61 141 0.55 29.9 6.78 11.20N
152 0 0 11 1 1 10 9 16 62 142 0.53 30.0 6.79 11.22N
152 30 0 10 42 13 10 10 43 63 143 0.51 30.0 6.80 11.23N
153 0 0 10 23 24 10 12 11 64 144 0.50 30.0 6.81 11.23N
153 30 0 10 4 33 10 13 41 64 146 0.48 30.0 6.80 11.23N
154 0 0 9 45 43 10 15 12 65 147 0.46 30.0 6.80 11.23N
154 30 0 9 26 53 10 16 44 66 148 0.45 30.0 6.79 11.21N
155 0 0 9 8 4 10 18 17 67 150 0.43 29.9 6.77 11.19N
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 54 %
1925 is triple:
AB 1.0 12.0 153" 33.0 (BUP 150) Graze path of B 308.39 km south, and 21.7 secs later compared to A
AC 1.0 10.5 367" 60.9 (BUP 150) Graze path of C 636.60 km south, and 504.9 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 -5.82 Lat +2.90
P +6.50 D -3.31
Illumination of moon 90%+
Elongation of Moon 142
Vertical Profile Scale 1.94 km/arcsec at mean distance of moon
Horizontal Scale Factor 1.32 deg/min
At longitude 152.00:
Limiting Magnitudes for various telescope apertures (in cm)
CA\Tdia 5 10 15 20 25 30 35
7.2 4.6 6.1 6.9 7.4 7.7 8.0 8.2
9.2 4.6 6.1 6.9 7.4 7.7 8.0 8.2
11.2 4.9 6.4 7.2 7.7 8.1 8.3 8.5
13.2 5.5 7.0 7.8 8.3 8.7 9.0 9.2
15.2 5.6 7.0 7.8 8.3 8.7 9.0 9.2
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Double star catalogue details
WDS entries
RA Dec Name Y1 Y2 N PA PA Sep Sep M1 M2
13252-1110BUP 150AB 1879 2007 4 33 33 144.4 152.5 0.98 12.0 -041-028 -10 3672 N D 132511.58-110940.4
13252-1110BUP 150AC 1879 1999 2 62 61 359.8 366.6 0.98 10.5 -043-032 N D 132511.58-110940.4
------------------------------------------------
Interferometric catalogue entries
132511.60-110940.5 HR 5056 alp Vir HD 116658 HIP 65474 13252-1110 N
Date PA Sep M1 M2
1975. V180. . 0.5 . 1.3 . 7.5 . 1 OCC2002 O
1975. V225. . 0.05 . 1.3 . 4.5 . 1 OCC2002 O
1988.166 . . < 0.038 . . . . . 549 22 3.6 1 McA1993 Sc
1989.3938 . . < 0.05 . . . . . 2.1 1 Iso1992 S
1991.25 . . < 0.1 . 0.89 . . . 511 222 0.3 1 HIP1997e Hh
1995.2090 V237. . . . . . . . 1260 290 1 Rch1996 O
2002.2408 . . < 0.13 . . . . . 900 340 3.6 1 Rbr2007 A
2002.2409 . . < 0.08 . . . . . 900 340 3.6 1 Rbr2007 A
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AAVSO Variable star entry
Variable identifier Type Max Min Ph Epoch Period
alf Vir EA+BCEP 0.95 ( 0.1 V 2419530.4900 4.014604
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Results of Observer Scan UT
Site Long. Lat. Dist. h m s
Brisbane 153.1 -27.5 83km 11 2 17
Bundaberg 152.3 -24.8 141km 11 0 24
Rockhampton 150.5 -23.4 186km 10 55 29
Lunar Limb Profile
