Predictions for Grazing Occultation of ZC 1925, 2013 Mar 28
Graze profile
Grazing Occultation of 1925SB1 Magnitude 1.0 [Red = 1.1] e
R1925 = Spica = alpha Virginis
Date: 2013 Mar 28 15h 45m, to 2013 Mar 28 15h 48m
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
172 0 0 -34 24 13 15 45 21 52 299 0.78 201.2 178.08 -6.75S
172 10 0 -34 25 59 15 45 36 52 299 0.78 201.2 178.04 -6.79S
172 20 0 -34 27 44 15 45 51 52 299 0.79 201.1 177.99 -6.83S
172 30 0 -34 29 28 15 46 6 52 299 0.79 201.1 177.95 -6.88S
172 40 0 -34 31 10 15 46 21 51 298 0.80 201.0 177.91 -6.92S
172 50 1 -34 32 52 15 46 36 51 298 0.80 201.0 177.86 -6.96S
173 0 1 -34 34 32 15 46 51 51 298 0.81 200.9 177.82 -7.01S
173 10 1 -34 36 11 15 47 6 51 298 0.81 200.9 177.78 -7.05S
173 20 1 -34 37 50 15 47 20 51 298 0.82 200.9 177.73 -7.09S
173 30 1 -34 39 27 15 47 35 50 297 0.83 200.8 177.68 -7.15S
173 40 1 -34 41 3 15 47 50 50 297 0.83 200.8 177.65 -7.18S
173 50 1 -34 42 37 15 48 4 50 297 0.84 200.7 177.60 -7.22S
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 299.65 km south, and 76.5 secs later compared to A
AC 1.0 10.5 367" 60.9 (BUP 150) Graze path of C 564.59 km south, and 565.5 secs later compared to A
Librations Long -4.19 Lat +2.43
P +177.63 D +2.53
Illumination of moon 98%-
Elongation of Moon 164
Vertical Profile Scale 1.93 km/arcsec at mean distance of moon
Horizontal Scale Factor 1.48 deg/min
At longitude 173.00:
Limiting Magnitudes for various telescope apertures (in cm)
CA\Tdia 5 10 15 20 25 30 35
-11.0 2.2 3.6 4.4 4.8 5.2 5.4 5.5
-9.0 2.2 3.6 4.4 4.8 5.2 5.4 5.5
-7.0 2.2 3.6 4.4 4.8 5.2 5.4 5.5
-5.0 2.2 3.6 4.4 4.8 5.2 5.4 5.5
-3.0 2.2 3.6 4.4 4.8 5.2 5.4 5.5
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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
Auckland 174.8 -36.9 223km 15 49 27
MidNZ 173.0 -41.0 697km 15 46 51
Lunar Limb Profile
