Predictions for Grazing Occultation of ZC 1925, 2013 Mar 28, near Lismore, NSW
Graze profile
Grazing Occultation of 1925SB1 Magnitude 1.0 [Red = 1.1] e
R1925 = Spica = alpha Virginis
Date: 2013 Mar 28 14h 58m, to 2013 Mar 28 15h 13m
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 -26 50 30 14 58 14 74 6 0.28 207.5 184.35 -0.45S
149 30 0 -27 5 11 14 59 32 74 3 0.28 207.4 184.23 -0.57S
150 0 0 -27 19 40 15 0 49 74 0 0.29 207.2 184.11 -0.69S
150 30 0 -27 33 56 15 2 5 74 357 0.29 207.1 183.99 -0.82S
151 0 0 -27 47 59 15 3 21 74 355 0.30 207.0 183.87 -0.94S
151 30 0 -28 1 48 15 4 36 73 352 0.30 206.9 183.74 -1.07S
152 0 0 -28 15 24 15 5 50 73 349 0.31 206.7 183.62 -1.20S
152 30 0 -28 28 47 15 7 3 73 347 0.32 206.6 183.49 -1.33S
153 0 0 -28 41 57 15 8 16 72 345 0.32 206.5 183.35 -1.46S
153 30 0 -28 54 53 15 9 28 72 342 0.33 206.3 183.22 -1.59S
154 0 0 -29 7 36 15 10 39 71 340 0.34 206.2 183.09 -1.72S
154 30 0 -29 20 5 15 11 50 71 338 0.35 206.1 182.95 -1.86S
155 0 0 -29 32 21 15 12 59 70 336 0.36 205.9 182.82 -2.00S
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 89 %
1925 is triple:
AB 1.0 12.0 153" 33.0 (BUP 150) Graze path of B 304.58 km south, and 44.1 secs later compared to A
AC 1.0 10.5 367" 60.9 (BUP 150) Graze path of C 609.40 km south, and 545.3 secs later compared to A
Librations Long -3.78 Lat +2.44
P +183.43 D +2.93
Illumination of moon 98%-
Elongation of Moon 164
Vertical Profile Scale 1.93 km/arcsec at mean distance of moon
Horizontal Scale Factor 1.35 deg/min
At longitude 152.00:
Limiting Magnitudes for various telescope apertures (in cm)
CA\Tdia 5 10 15 20 25 30 35
-5.2 2.2 3.6 4.4 4.9 5.3 5.5 5.7
-3.2 2.2 3.6 4.4 4.9 5.3 5.5 5.7
-1.2 2.2 3.6 4.4 4.9 5.3 5.5 5.7
0.8 2.2 3.6 4.4 4.9 5.3 5.5 5.7
2.8 2.2 3.6 4.4 4.9 5.3 5.5 5.7
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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 . . < 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 125km 15 8 23
Bundaberg 152.3 -24.8 361km 15 6 39
Pt Macquarie 152.8 -31.4 275km 15 7 52
Lunar Limb Profile
