Predictions for Grazing Occultation of ZC 1925, 2013 Jan 5, near Lismore, NSW
Graze profile Lismore
Grazing Occultation of 1925SB1 Magnitude 1.0 [Red = 1.1] e
R1925 = Spica = alpha Virginis
Date: 2013 Jan 05 19h 44m, to 2013 Jan 05 19h 56m
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
151 0 0 -28 16 4 19 44 1 7 71 28 0.34 28.6 5.49 -7.15N
151 30 0 -28 32 27 19 45 31 8 71 25 0.34 28.5 5.39 -7.05N
152 0 0 -28 48 38 19 47 0 8 71 22 0.34 28.4 5.29 -6.95N
152 30 0 -29 4 37 19 48 29 9 71 20 0.34 28.3 5.19 -6.85N
153 0 0 -29 20 23 19 49 58 10 71 17 0.34 28.2 5.08 -6.74N
153 30 0 -29 35 57 19 51 26 11 71 14 0.34 28.1 4.97 -6.63N
154 0 0 -29 51 17 19 52 54 12 71 11 0.34 27.9 4.86 -6.52N
154 30 0 -30 6 23 19 54 21 12 71 9 0.34 27.8 4.74 -6.40N
155 0 0 -30 21 17 19 55 48 13 71 6 0.35 27.7 4.62 -6.28N
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 52 %
1925 is triple:
AB 1.0 12.0 153" 33.0 (BUP 150) Graze path of B 306.16 km south, and 34.8 secs later compared to A
AC 1.0 10.5 367" 60.9 (BUP 150) Graze path of C 621.21 km south, and 536.5 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 -5.97 Lat +3.07
P +4.77 D -3.33
Illumination of moon 43%-
Elongation of Moon 82
Vertical Profile Scale 1.96 km/arcsec at mean distance of moon
Horizontal Scale Factor 1.33 deg/min
At longitude 153.00:
Limiting Magnitudes for various telescope apertures (in cm)
CA\Tdia 5 10 15 20 25 30 35
-10.7 2.2 3.6 4.4 4.9 5.2 5.5 5.6
-8.7 2.2 3.6 4.4 4.9 5.2 5.5 5.6
-6.7 2.2 3.6 4.4 4.9 5.2 5.5 5.6
-4.7 2.2 3.6 4.4 4.9 5.2 5.5 5.6
-2.7 2.2 3.6 4.4 4.9 5.2 5.5 5.6
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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 182km 19 50 7
Bundaberg 152.3 -24.8 403km 19 47 59
Pt Macquarie 152.8 -31.4 204km 19 49 28
Lunar Limb Profile - Lismore
